HF Welder for ERW Tube Mill: Types, IGBT vs SiC & Selection Guide

May . 06, 2026 10:16

What is an HF Welder?

An HF (High Frequency) Welder is the core equipment in an ERW tube mill.
Its main function is to heat the edges of the steel strip using high-frequency current and then forge them together to form a strong, continuous weld.

In simple terms:
👉 It “melts + presses” the strip edges to make a pipe.

This process is fast, clean, and ideal for producing high-quality welded steel tubes.

How Does an HF Welder Work?

The working principle is based on high-frequency electromagnetic induction:

Steel strip is formed into a round tube
High-frequency current flows through the strip edges
The edges heat up rapidly due to resistance
Squeeze rollers press the edges together
A solid weld seam is formed instantly

✔ No filler material needed
✔ High efficiency and stable quality

Main Types of HF Welders

There are several types of HF welders used in the market today. The most common ones include:

1. Solid State HF Welder

Features:

Uses IGBT or MOSFET technology
High electrical efficiency
Stable output
Lower maintenance

Advantages:

✅Energy saving

✅Long service life

✅Easy to operate

Best for:
Most modern ERW tube mills (recommended choice)

2. SiC HF Welder

Features:

Uses Silicon Carbide devices
Higher switching frequency
Better heat resistance

Advantages:

✅ Higher efficiency than traditional solid state

✅Smaller size

✅Faster response

Best for:
High-speed production lines or premium tube manufacturing

3. Vacuum Tube HF Welder

Features:

Traditional technology
Uses vacuum tubes

Advantages:

✅Mature and widely used in old systems

Disadvantages:
✘ High power consumption
✘ Large size
✘ More maintenance

Best for:
Older production lines or low-budget projects

HF Welder Comparison Table

Type	Efficiency	Maintenance	Cost	Technology Level	Recommendation
Solid State	High	Low	Medium	Modern	⭐⭐⭐⭐⭐
SiC	Very High	Low	Higher	Advanced	⭐⭐⭐⭐⭐
Vacuum Tube	Low	High	Lower	Traditional	⭐⭐

How to Choose the Right HF Welder?

Choosing the right HF welder depends on several key factors:

1. Tube Size & Thickness⚙️

Larger diameter and thicker wall → require higher power
Always match welder power with production capacity

2. Production Speed⚡

High-speed lines → choose SiC HF welder
Normal speed → Solid state HF welder is enough

3. Budget💰

Limited budget → Solid state is the best balance
High-end demand → SiC for long-term savings

4. Maintenance Capability🚀

If you want low maintenance → avoid vacuum tube type

Where is HF Welder Used in the Tube Mill?

In a typical ERW tube mill line, the HF welder is installed:

👉 After forming section
👉 Before sizing section

It is the key process that determines weld quality.

Why HF Welder Matters

A good HF welder directly affects:

✔ Weld strength
✔ Production stability
✔ Energy consumption
✔ Final tube quality

Choosing the right system can significantly improve your production efficiency and reduce costs.

About AIS Machinery

AIS Machinery is a professional manufacturer of ERW tube mill solutions, providing:

High-performance HF welders
Complete tube mill lines
Technical support & customization

We help customers achieve stable production, high efficiency, and long-term reliability.

Pervious

How to Choose the Right External Burr Scraper Blade

Industrial Guide on What is a Tube Mill and How it Works

Related News

2026-10-04 16:13:15

HEBEI AIS MACHINERY at Tube & Wire Shanghai 2026 | Tube Mill Solutions

HEBEI AIS MACHINERY participated in Tube & Wire Shanghai 2026, meeting new and long-term customers to discuss ERW tube mills, steel processing equipment, new projects, and future cooperation.

2026-08-18 09:42:30

August Promotion at AIS Machinery – Complete Solutions for ERW Tube Mills & Steel Processing

AIS Machinery August Promotion is here! We are offering competitive prices on ERW Tube Mills, Slitting Lines, Cut-to-Length Lines, Cold Roll Forming Machines and Tube Mill Spare Parts. Whether you are planning a new tube production line, upgrading existing equipment, or looking for reliable spare parts, we can provide a complete solution. Our professional engineers offer technical support from machine selection to production, installation and after-sales service. Contact AIS Machinery this August and let us help you find the right equipment for your project.

2026-08-17 09:43:30

C U Purlin Roll Forming Machine | Flexible C/U Profile Production

CU Profile Roll Forming Machine is designed to continuously produce C and U-shaped steel profiles from metal coils. The complete line can include a decoiler, leveling and feeding system, punching unit, roll forming machine, cutting system and run-out table. Depending on production requirements, the machine can use manual C/U changeover or computer-controlled automatic size adjustment. It is suitable for producing C/U channels, structural profiles, framing components and other steel sections with consistent dimensions and reliable production efficiency.

2026-08-13 10:50:44

Double Head Uncoiler for Tube Mills: Continuous Coil Loading and Faster Production

Double Head Uncoiler is an efficient coil feeding machine designed for ERW tube mills, pipe mills, and coil processing lines. With two hydraulic expanding mandrels, it allows one steel coil to run while the next coil is prepared, reducing coil changeover time and production downtime. The hydraulic drive provides stable and reliable coil unwinding, making the double head uncoiler an ideal solution for medium and large-size tube mills, heavy steel coils, and high-production applications.

2026-08-12 10:17:44

Buying a Steel Slitting Line? 8 Key Specifications You Should Know

Looking for a reliable Steel Slitting Line for your tube or pipe production? Our Coil Slitting Machine is designed to convert wide steel coils into accurate narrow strips for ERW Tube Mills, roll forming lines and other applications. From HR, CR and galvanized steel to different coil widths, thicknesses and weights, the slitting line can be customized to your requirements. ⚙️ Learn how to select the right slitting capacity, strip width, coil weight and production speed for your business.

2026-08-11 09:25:01

Conveyor and Run Out Table for ERW Tube Mill | Pipe Conveying & Discharge System

Conveyor and Run Out Table is an important pipe handling system in an ERW Tube Mill, mainly installed after the flying saw or cold saw. It supports, conveys, aligns, buffers, and discharges finished pipes smoothly to the next process. A properly designed run out table can reduce manual handling, protect pipe surfaces, and improve production efficiency. With customized roller layout, conveying speed, table length, and discharge design, it can be matched with different pipe sizes, production speeds, and downstream stacking or packing systems.

2026-08-10 10:07:47

3 Inch–5 Inch Tube Mill: The Most Popular Size Range for ERW Pipe Production

3–5 Inch ERW Tube Mill is one of the most popular choices for steel pipe manufacturers. This tube mill size range is widely used for producing round, square, and rectangular steel tubes for construction, machinery, furniture, automotive, and structural applications. With flexible tube diameter and wall thickness options, a 3 inch, 4 inch, or 5 inch tube mill can meet different production requirements. Learn how to choose the right ERW tube mill based on your products, target market, production speed, and future demand.

2026-08-06 09:50:37

Cold Roll Forming Machine with Punching: A Complete Guide for Custom Metal Profiles

A Cold Roll Forming Machine with Punching combines precision roll forming and automatic punching in one efficient production line. It can produce C channels, U channels, garage door struts, solar mounting profiles, and many other custom steel sections with round holes, slots, or special cutouts. The punching system improves production efficiency, reduces secondary processing, and ensures accurate hole positioning. AIS Machinery provides customized roll forming solutions based on your profile drawings and production requirements.