Introducción

A high frequency tube mill forms metal strip continuously into an open tubular section and then joins the two strip edges using high-frequency welding before the tube passes through sizing, straightening, cutting, and downstream handling.

The welding operation happens within a relatively small section of the production line, but the quality of the longitudinal seam depends on much more than welding power alone. Strip-edge condition, forming accuracy, weld V geometry, induction-coil position, impeder condition, line speed, squeeze-roll pressure, cooling, and even upstream mill alignment can influence whether the weld remains stable.

This makes high-frequency welding a good example of why tube manufacturing needs to be treated as one connected process. A welder cannot reliably correct strip edges that arrive at different heights, unstable tube geometry, poor mill alignment, or inconsistent raw material.

Understanding how high-frequency welding actually works helps operators and production engineers distinguish between electrical welding problems and mechanical forming problems, making troubleshooting more systematic and reducing unnecessary machine adjustments.

JBLDIE Línea de producción de molinos de tubos integrates continuous forming, welding, sizing, cutting, and related processing for round, square, and rectangular tube production.

What Is a High Frequency Tube Mill?

A high frequency tube mill is a continuous manufacturing system that produces welded tube from metal strip.

A typical process can include:

coil loading → strip preparation → accumulation → breakdown forming → fin-pass forming → high-frequency welding → scarfing → cooling → sizing → straightening → cutting → handling

Flat strip gradually changes into an open tubular section as it passes through multiple forming stands.

Near the welding section, the two strip edges approach one another and create a V-shaped opening. High-frequency electrical energy heats a narrow region along these edges. Squeeze rolls then bring the heated edges together under pressure to create the continuous longitudinal weld.

After welding, excess material around the seam can be removed where required before the tube continues through cooling and sizing.

The finished result depends on how well all of these stages are coordinated.

How Does High-Frequency Tube Welding Work?

High-frequency induction welding does not normally heat the complete tube cross-section.

Instead, electrical energy is concentrated near the two approaching strip edges.

An induction coil positioned around or close to the tube introduces high-frequency current into the material. Because of the electrical behavior produced at high frequency and the geometry of the approaching edges, current becomes concentrated along the edges of the weld V.

Those edges heat rapidly.

At the squeeze-roll position, the heated surfaces are forced together. Pressure consolidates the joint and expels material from the interface, creating the longitudinal seam.

The Welding Institute (TWI) explains in its high-frequency induction welding overview that the strip is first formed toward a cylindrical section, the edges create a V before the squeeze rolls, high-frequency current concentrates heating along those edges, and squeeze rolls consolidate the joint.

This explains why weld quality depends on both electrical energy and mechanical geometry.

Why High Frequency Is Used for Continuous Tube Production

The primary advantage of high-frequency welding in tube manufacturing is its ability to concentrate heat within a relatively narrow region near the strip edges while the material moves continuously.

The complete strip does not need to be heated to the same temperature as the joint area.

This supports continuous production because heating occurs rapidly as the material approaches the welding point.

The process is therefore well suited to manufacturing long welded tubes where forming, welding, and sizing operate as one continuous line.

However, high production capability does not mean the process is automatically stable.

As line speed changes, the time available for heating changes as well. Tube dimensions, wall thickness, material, weld V geometry, and welding-system position also affect the required process conditions.

A high frequency tube mill therefore needs a controlled operating window rather than one fixed welding-power setting.

The Weld V Is Central to HF Welding

One of the most important geometrical features in high-frequency tube welding is the weld V.

Before the strip edges finally meet, they form an open V-shaped region.

This V influences how electrical current travels toward the weld point and where heating becomes concentrated.

If the V remains stable, the electrical and thermal conditions are easier to control.

If it changes continuously because of unstable forming, strip movement, fin-pass problems, or incorrect squeeze-roll setup, welding conditions also change.

TWI notes that for steel HF induction welding, a relatively small included V angle is commonly used, although the actual value needs to suit the specific process.

For production engineers, the important point is not to chase one universal V angle. The objective is to maintain the geometry for which the tube mill and welding process were established.

What Creates an Unstable Weld V?

An unstable weld V can originate well before the induction coil.

Posibile cauze includ:

• incorrect strip width,
• inconsistent forming,
• worn breakdown rolls,
• incorrect fin-pass settings,
• tube movement,
• unequal strip-edge height,
• desalineación del molino,
• squeeze-roll movement,
• o variación material.

This is why repeatedly changing electrical power may not solve an unstable weld.

If the mechanical geometry entering the welding section changes continuously, the electrical process is also being asked to operate under continuously changing conditions.

The better troubleshooting approach is to first determine whether the tube arrives at the welding section consistently.

Fin Passes Prepare the Tube for Welding

Fin-pass rolls are located near the end of the forming section.

Their job is to control the open tube geometry and prepare the strip edges for welding.

The fin passes help establish:

• tube circumference,
• strip-edge position,
• weld V development,
• alineación de bordes,
• and stable entry into the weld section.

If the fin-pass rolls are incorrectly adjusted, the edges may not approach the welding point consistently.

Excessive pressure can also distort the strip or create unnecessary work in the material.

Insufficient control can allow the tube to move.

Fin-pass condition should therefore be checked when welding instability develops, particularly if changing electrical settings produces little improvement.

Strip Width Affects Weld Preparation

Correct strip width is fundamental to tube forming.

The flat strip eventually becomes the circumference of the welded tube, so even relatively small differences in strip width can alter how the material fills the tooling.

If the strip is too wide, the forming section may place excessive compression on the edges or change the geometry approaching the weld.

If it is too narrow, the strip edges may not reach the expected relationship at the weld point.

Strip-width variation can therefore create welding symptoms even though the original problem comes from material preparation.

When a stable high frequency tube mill suddenly develops seam inconsistency after a coil change, checking slit width and edge condition should be one of the early troubleshooting steps.

Edge Quality Matters Before Heating Begins

The surfaces that eventually become the longitudinal seam begin as the slit edges of the strip.

Their condition influences the welding interface.

Potential problems include:

• burr excesiv,
• daune de câmp,
• inconsistent slitting,
• contamination,
• oxidation,
• and local deformation.

A damaged strip edge can arrive at the weld point differently from a properly prepared edge.

Contamination may also interfere with the intended interface.

This makes slitting quality part of the tube welding process even though slitting may happen outside the tube mill itself.

A welding system performs most predictably when the incoming edges remain geometrically and materially consistent.

High-Frequency Current Concentration

The electrical characteristics of HF welding allow current to become concentrated near the strip surfaces and along the path created by the approaching edges.

Two principles are commonly discussed when explaining this behavior: the skin effect and proximity effect.

At high frequency, current tends to concentrate nearer the surface of a conductor rather than distributing uniformly throughout the complete section.

At the same time, the close relationship between the two approaching strip edges helps influence where current flows.

In tube welding, these effects help focus electrical heating near the surfaces that need to be joined.

This is one reason high-frequency welding can heat the seam region rapidly while limiting the amount of surrounding material that undergoes the same thermal cycle.

For production operation, however, the key practical lesson remains straightforward: changing edge geometry changes the electrical path.

Why the Induction Coil Position Matters

The induction coil introduces electrical energy into the tube close to the welding section.

Its position relative to the weld V and squeeze rolls influences how efficiently energy reaches the required area.

If the coil position changes significantly from the established setup, the heating condition can change as well.

Operators may then respond by adjusting welding power even though the original change is mechanical.

Commissioning and maintenance procedures should therefore establish reference positions for welding-system components.

When weld performance changes unexpectedly, check whether the coil or related equipment has moved before assuming that the power source itself has developed a problem.

What Does the Impeder Do?

Many high-frequency tube welding systems use an impeder positioned inside the tube near the weld area.

Its purpose is to influence the electrical path and help concentrate energy where welding is required rather than allowing excessive current to travel around the entire tube circumference.

Impeder condition and position therefore influence welding efficiency.

Problems can occur if the impeder:

• moves from its intended location,
• experiences overheating,
• becomes physically damaged,
• receives inadequate cooling where required,
• or is unsuitable for the tube size being produced.

A deteriorating impeder can lead operators to increase welding power in an attempt to maintain the same seam condition.

This may treat the symptom temporarily without correcting the underlying loss of electrical efficiency.

Squeeze Rolls Create the Joint

Heating the strip edges is only part of the process.

The edges must also be brought together under controlled pressure.

Squeeze rolls perform this function.

They establish the final mechanical relationship at the welding point and force the heated surfaces together.

The correct setup should provide enough pressure to create a stable consolidated joint without introducing unnecessary deformation to the tube.

Too little effective pressure can contribute to incomplete joining.

Excessive pressure can create:

• excessive weld upset,
• dimensional distortion,
• unnecessary tooling load,
• or changes in tube geometry.

The squeeze rolls must also remain aligned so that pressure is applied predictably around the seam.

Weld Upset Is Part of the Process

When heated edges are squeezed together, material can be displaced from the weld interface.

This creates a weld upset or bead.

Depending on the finished tube specification, the outside bead may be removed immediately after welding. Some tube applications may also require internal bead control or removal.

The amount and consistency of upset can provide useful information about process stability.

A bead that changes continuously may indicate that heating, edge geometry, or squeeze conditions are also changing.

The objective is therefore not simply to produce as much upset as possible.

A stable tube mill should create a repeatable weld condition consistent with the material and applicable tube requirements.

Scarfing Must Follow a Stable Weld

Scarfing equipment removes excess weld bead from the tube surface.

The scarfing tool must be positioned carefully.

If it cuts too deeply, it can remove base material.

If it cuts too shallowly, excessive bead can remain.

Tool wear can also change the result over time.

However, scarfing problems sometimes originate upstream.

If weld upset changes significantly from one section of tube to another, the scarfing tool is being asked to remove a constantly changing amount of material.

The production team should therefore distinguish between:

stable weld + incorrect scarfing

y

unstable weld + scarfing unable to follow the changing bead.

Solving the correct problem prevents unnecessary tool adjustment.

Welding Energy and Line Speed Must Work Together

One of the most important process relationships in a high frequency tube mill is welding energy versus line speed.

At higher line speed, each point on the strip spends less time travelling through the effective heating region.

At lower speed, the same point remains in the region longer.

This means welding power cannot be considered independently from production speed.

If speed increases substantially while the welding condition remains unchanged, the available energy per unit of moving material changes.

Similarly, reducing line speed without adjusting the welding process can create a different thermal condition.

The production recipe should therefore coordinate:

• velocidad de línea,
• tube size,
• grosor de pared,
• material,
• welding energy,
• and established weld geometry.

Wall Thickness Changes the Welding Requirement

A thicker tube wall contains more material at each strip edge.

The required heating condition therefore differs from that of a thin-wall tube.

Wall thickness also affects forming forces and squeeze-roll setup.

When changing from one thickness to another, operators should not assume that the same high-frequency settings will remain appropriate.

The process should be re-established according to the approved production parameters and verified through finished-tube inspection or testing.

The same principle applies when material grade changes.

Different steels can respond differently to forming and welding even when their nominal dimensions remain the same.

Tube Diameter Also Matters

Changing tube diameter alters the complete forming geometry.

Fin-pass position, weld V behavior, induction-coil relationship, impeder configuration, squeeze-roll position, and sizing settings may all change.

This is why tube-mill changeover is not simply a matter of selecting another diameter on the HMI.

Mechanical components need to return to the correct positions for the new tube.

When welding problems repeatedly appear immediately after size changeover, setup consistency should be investigated before major changes are made to welding power.

High-Frequency Welding Control Factors

Process Factor	Role in Welding	Possible Effect if Unstable
Ancho de la tira	Establishes material circumference	Incorrect edge relationship
Strip-edge condition	Creates weld interface	Costura irregular
Forming accuracy	Positions the two edges	Desajuste de bordes
Fin-pass setup	Controls pre-weld geometry	Unstable weld V
Weld V	Influences current path and heating	Variable weld condition
Induction coil	Introduces HF energy	Inefficient or changing heating
Impeder	Helps control current path	Loss of welding efficiency
Velocidad de línea	Determines heating time	Under- or overheating
Energía de soldadura	Heats strip edges	Incomplete or excessive heating
Apriete los rollos	Consolidar los bordes calentados	Weak or excessive upset
Scarfing	Removes weld bead	Surface or wall damage
Enfriamiento	Stabilizes tube before sizing	Downstream dimensional variation

Edge Mismatch Is Often a Forming Problem

Edge mismatch occurs when the two strip edges reach the welding point at different positions.

One edge may be higher than the other or the seam may not sit where expected relative to the tube centerline.

It can be tempting to describe this as a welding defect because it appears directly at the seam.

In reality, the cause often lies in:

• seguimiento de tiras,
• forming-roll alignment,
• fin-pass adjustment,
• incorrect strip width,
• desgaste de herramientas,
• or mill centerline.

Electrical power cannot correct a mechanical edge-height difference.

The tube should therefore be inspected before it reaches the welding point to determine when the mismatch first develops.

What Causes an Incomplete HF Weld?

An incomplete joint can have several possible causes.

Insufficient effective heating is one possibility.

However, it is not the only one.

Other conditions can include:

• poor edge contact,
• unstable weld V,
• incorrect squeeze-roll pressure,
• contaminated strip edges,
• unsuitable line speed,
• incorrect component position,
• or inconsistent forming.

Troubleshooting should therefore follow a sequence.

First verify the material and edge condition.

Then verify mechanical geometry.

After those factors are stable, evaluate welding energy and other electrical conditions.

This reduces the risk of masking a mechanical problem by continuously increasing power.

Excessive Heat Can Also Create Problems

More welding power does not automatically create a stronger tube.

Excessive effective heat can produce undesirable changes around the seam and create excessive weld upset.

It can also make scarfing more difficult because more material needs to be removed.

The most stable process operates within the required thermal window rather than at the highest possible energy.

Operators should therefore adjust the process based on verified weld condition and applicable tube requirements instead of treating power as a simple quality control scale.

Cooling Begins Immediately After Welding

After the seam is created and scarfing is completed where required, the tube remains hot around the welding region.

Cooling prepares the tube for downstream sizing and further processing.

The cooling system should operate consistently across normal production conditions.

Uneven cooling can influence:

• tube distortion,
• sizing behavior,
• ticălos,
• and thermal stability.

Cooling conditions can also interact with line speed.

A faster-moving tube spends less time within a given fixed cooling section.

This is another reason production speed affects more than the welding power setting alone.

Sizing Cannot Repair a Poor Weld

After cooling, the tube moves through sizing stands that control final diameter or further reshape it into square and rectangular profiles.

Sizing is essential for dimensional accuracy, but it should not be used to compensate for an unstable seam.

A poor weld remains a weld-quality problem even if later rollers make the outside dimensions look correct.

Aggressive sizing can also place additional strain around the welded region.

The tube should therefore leave the welding section in a stable condition before final dimensional calibration.

JBLDIE Máquina formadora de tubos cuadrados uses continuous forming, high-frequency welding, sizing, and straightening when processing metal coil into round, square, and rectangular tube profiles.

Round-to-Square Forming Adds Another Load After Welding

Some tube mills first produce a welded round tube and then reshape it into a square or rectangular section.

In this process, the longitudinal seam experiences additional downstream deformation as the round tube develops four faces and corners.

This makes weld stability particularly important.

The seam must withstand the later forming process associated with the required product.

If weld quality is marginal before reshaping, downstream deformation may reveal the problem.

For square and rectangular tube production, welding and final forming should therefore be evaluated as connected stages.

Why Weld Quality Can Change After Tooling Changeover

Tube-mill changeover affects many mechanical references.

Changing the product can involve:

• rollos de desglose,
• pases fin,
• induction coil,
• impeder,
• strânge role,
• herramientas de bufanda,
• sizing rolls,
• and straightening equipment.

Even if the same welding power recipe is loaded automatically, mechanical positions may differ slightly from the previous successful setup.

This can change weld V geometry and electrical efficiency.

A repeatable changeover procedure should therefore document important mechanical reference positions as well as control-system values.

Successful high-frequency welding depends on both.

Use Weld Bead Behavior as a Process Indicator

Experienced production teams often monitor the weld region continuously because changes in bead appearance can provide an early indication that the process is drifting.

The bead should not be evaluated in isolation, but changes can prompt further investigation.

For example, a sudden change following a new coil may suggest material or edge differences.

A gradual change during a long run may suggest tooling movement, component wear, heating-system changes, or process drift.

Rather than immediately adjusting the welder, operators can compare the change against:

• ancho de tira,
• mill setup,
• velocidad de línea,
• squeeze-roll condition,
• and component positions.

This makes weld observation part of process monitoring.

High Frequency Tube Mill Troubleshooting Table

Symptom	Posibles causas	First Checks
Incomplete seam	Low effective heat, poor edge contact	Weld V, edge alignment, welding condition
Desajuste de bordes	Forming or fin-pass error	Strip tracking and roll alignment
Perno de soldadura variable	Changing heat or squeeze conditions	Speed, V geometry, squeeze rolls
Excessive upset	Excessive heat or pressure	Welding energy and squeeze setup
Seam moves sideways	Mill tracking problem	Centerline, guides and forming stands
Irregular scarf	Variable bead or tool setup	Weld stability and scarfing tool
Weld changes after size change	Incorrect mechanical setup	Fin passes, coil, impeder, squeeze rolls
Weld deteriorates after coil change	Material or slit-edge difference	Strip width, thickness and edge condition

These relationships should be used as diagnostic starting points rather than universal conclusions.

Why Changing Several Parameters at Once Is a Mistake

When a weld becomes unstable, operators may change:

• welding power,
• speed,
• presión de compresión,
• fin-pass position,
• and coil position

at the same time.

If the weld improves, no one knows which change solved the problem.

The next time the same symptom appears, the troubleshooting process starts from zero again.

A better method is to first document the symptom and determine whether the mechanical geometry is stable.

Once material, forming, edge position, and welding-system component positions are verified, change one meaningful welding variable at a time where practical.

Record the result.

This creates process knowledge rather than temporary correction.

Production Recipes Improve Repeatability

A high frequency tube mill producing many tube specifications benefits from documented baseline settings.

A production recipe can contain information such as:

• tube size,
• material,
• grosor de pared,
• velocidad de línea,
• welding-power reference,
• fin-pass settings,
• squeeze-roll settings,
• poziția coilor,
• impeder configuration,
• cooling condition,
• and sizing references.

Digital controls can store some values automatically.

Mechanical setup information should still be documented separately where required.

The objective is to return each tube specification to a known starting condition during changeover.

Weld Quality Needs to Be Verified, Not Assumed

A stable-looking seam does not by itself prove that the finished tube meets its required welding specification.

The appropriate verification method depends on the tube application and applicable standard.

Inspection may include combinations of:

• visual examination,
• dimensional checks,
• destructive sample testing,
• flattening or expansion testing where applicable,
• nondestructive examination,
• or other product-specific verification.

The required approach differs between general fabrication tube, structural tube, mechanical tube, and other applications.

Manufacturers should therefore define weld acceptance requirements from the applicable product specification before production begins.

Quality Control Should Include Process and Product Data

Finished-product inspection shows whether the tube meets requirements.

Process monitoring helps explain why it does or does not.

Useful production information may include:

• material coil identification,
• strip dimensions,
• tube size,
• grosor de pared,
• velocidad de línea,
• welding parameters,
• product-change time,
• inspection results,
• and recorded abnormalities.

If seam quality later changes, this information can reveal whether the issue coincided with:

• a new coil,
• a new size,
• increasing speed,
• tooling maintenance,
• or another process change.

This supports more evidence-based troubleshooting.

Preventive Maintenance for the HF Welding Section

High-frequency welding performance depends on equipment condition.

Maintenance should include appropriate checks of:

• induction-coil condition,
• connections,
• impeder condition,
• cooling systems,
• strânge role,
• rodamientos,
• guías,
• herramientas de bufanda,
• cables,
• sensores,
• and associated electrical equipment.

The fin-pass and forming stands should also be included because mechanical wear upstream directly affects welding geometry.

Preventive maintenance should therefore cross the traditional boundary between the “forming machine” and “welder.”

They function as one process.

When the Welder Is Not the Real Problem

One of the most valuable troubleshooting lessons in tube manufacturing is that a seam defect does not automatically mean the welding equipment is faulty.

Consider four examples.

If the strip is too narrow, the edges approach incorrectly.

If a fin roll is worn, the weld V changes.

If a squeeze roll moves, consolidation changes.

If the mill tracks sideways, the seam position moves.

All four problems appear near the weld.

None is solved reliably by replacing or increasing the high-frequency power source.

This is why experienced troubleshooting starts by separating:

material problems

de

mechanical forming problems

de

welding-system problems.

How to Evaluate a High Frequency Tube Mill

When evaluating a high frequency tube mill, manufacturers should look beyond nominal line speed and welding-generator capacity.

Start with the actual tube range.

Define:

• minimum and maximum diameter,
• square and rectangular sizes where required,
• wall-thickness range,
• material grades,
• applicable standards,
• required tube length,
• and product mix.

Then evaluate how the mill controls the welding process.

Las preguntas importantes incluyen:

• How are strip edges prepared?
• How is the forming centerline maintained?
• ¿cómo se ajustan los pases de aletas?
• ¿cómo se controla la soldadura V?
• How is the induction coil positioned?
• How is the impeder selected and supported?
• ¿cómo se ajustan los rollos de compresión?
• How is weld bead removed?
• ¿Cómo se enfría el tubo?
• How are different sizes changed?
• How is finished weld quality verified?

This process-focused evaluation is more meaningful than comparing power ratings alone.

What Information Should Be Provided Before Configuring the Mill?

A tube mill supplier needs detailed production information before developing the appropriate configuration.

Informații utile include:

Dimensiones del tubo

Provide all round, square, and rectangular specifications expected on the line.

Espesor de pared

Define minimum, maximum, and normal production thicknesses.

Material

Identify steel grades and relevant strip specifications.

Tube standards

Specify applicable product and dimensional requirements.

Distribución de producción

Identify which tube sizes will represent the majority of production.

Required lengths

Define normal and maximum finished tube lengths.

Expectativas de cambio

Explain how frequently sizes are expected to change.

Requisitos de soldadura

Identify required seam-quality and inspection expectations.

Downstream processing

Clarify whether tube will later be reshaped, laser cut, punched, galvanized, welded into assemblies, or processed further.

These details allow the mill and welding section to be engineered around real production requirements.

How Automation Supports HF Tube Mill Stability

Automation can help maintain repeatable production conditions by storing process recipes, coordinating line speed, monitoring alarms, tracking production quantities, and synchronizing downstream equipment.

It can also reduce some manual setup errors.

However, automation cannot correct incorrect mechanical geometry automatically unless the equipment is specifically designed with suitable adjustment and measurement systems.

A PLC can command the same welding value every day, but if a fin pass is physically installed in a different position, the welding condition can still change.

The strongest production systems therefore combine:

• automated control,
• documented mechanical setup,
• trained operators,
• process monitoring,
• and finished-product inspection.

Conclusión

A high frequency tube mill creates welded tube through a closely connected sequence of forming, high-frequency heating, squeeze consolidation, scarfing, cooling, sizing, and finishing.

The weld itself forms within a very small area, but its stability depends on conditions established across the whole line.

Strip width and edge quality affect the weld interface. Breakdown and fin-pass rolls determine how the edges approach each other. Weld V geometry influences high-frequency current concentration. The induction coil and impeder affect energy delivery, while line speed changes the available heating time. Squeeze rolls provide the mechanical pressure needed to consolidate the heated edges.

For this reason, high-frequency tube welding should never be controlled by power setting alone.

When seam problems occur, manufacturers should first verify material and mechanical geometry, then examine electrical welding conditions. Documented setup values, systematic changeovers, preventive maintenance, process monitoring, and appropriate weld testing all help create a more repeatable manufacturing process.

Understanding these relationships makes it easier to operate the tube mill as an integrated system rather than treating the welder as an isolated machine.

Preguntas frecuentes

What is a high frequency tube mill?

A high frequency tube mill is a continuous production line that forms metal strip into tube and uses high-frequency welding to join the two strip edges into a longitudinal seam before sizing, straightening, and cutting.

How does high-frequency tube welding work?

High-frequency electrical current heats a narrow region along the approaching strip edges. The heated edges are then brought together by squeeze rolls, which consolidate the joint and create the continuous longitudinal weld.

What is the weld V in a tube mill?

The weld V is the V-shaped opening formed by the two strip edges immediately before they meet at the welding point. Its geometry affects the electrical current path and heating behavior during high-frequency welding.

Why does high frequency tube mill weld quality change after size changeover?

Changing tube size can alter fin-pass positions, weld V geometry, induction-coil position, impeder configuration, squeeze-roll setup, scarfing, and other mechanical conditions. These changes can affect welding even when the same electrical settings are restored.

Can increasing welding power fix an unstable tube weld?

Not always. Unstable welding can result from strip-width variation, poor edge condition, incorrect forming, unstable weld V geometry, squeeze-roll setup, or component position. The mechanical and material causes should be checked before power is increased.

Need to Evaluate a High Frequency Tube Mill?

High-frequency tube production should be configured around the actual tube sizes, wall thickness, materials, welding requirements, production range, changeover frequency, and downstream processes. If you are planning a new welded tube production line, póngase en contacto con JBLDIE to discuss your tube specifications and manufacturing requirements.