200kW HF Welder for ERW Tube Mill

A 200kW HF Welder is a powerful industrial welding system used to join the longitudinal seam of steel pipes by applying high-frequency electric current. It is commonly used in ERW pipe production lines for welding round, square, or rectangular steel tubes.

• 200kW: The welder delivers 200 kilowatts of electrical power — suitable for larger diameter and thicker-wall pipes (typically up to 219mm or more in diameter).

• High-Frequency: Uses AC current at 150–400 kHz, which rapidly heats the pipe edges by electrical resistance.

• Solid-State Type (usually): Uses advanced semiconductors (IGBT or MOSFET) for higher efficiency and reliability.

⚙️ How Does a 200kW HF Welder Work?

1. The steel strip is formed into a tube using a forming mill.

2. As the two edges come together, a high-frequency current is introduced (via induction coil or contact tips).

3. The electrical resistance at the joint generates heat rapidly.

4. No external filler or flame is used — the edges are forged together by squeeze rollers.

5. This creates a clean, high-strength weld with minimal heat-affected zone (HAZ).

🧠 How to Choose a 200kW HF Welder

🛠️ How to Use a 200kW HF Welder (Basic Steps)

1. Start Cooling System: Ensure water flow to the generator and induction coil is active and stable.

2. Power On: Use the control cabinet to start the generator and set power levels.

3. Align Induction Coil or Contact Tips: Position them precisely around/near the pipe seam.

4. Start Line Operation: Feed the strip through forming mill; edges should meet at welding point.

5. Adjust Welding Parameters: Fine-tune power and frequency to optimize seam fusion.

6. Monitor Quality: Check for smooth, complete welds with minimal burr or spatter.

7. Routine Maintenance: Clean filters, inspect the coil/tips, and replace impeder rods regularly.

How to Select the Right HF Welding Machine