Welding process of ERW steel pipe

　　Welding technology controls the production and quality of ERW steel pipe. Below are the technical control methods we applied to ensure the high quality and efficiency of ERW steel pipe production.

　　1. Weld Gap Control

　　2. Welding Temperature Control

　　3. Pressing Force Control

　　4. Frequency Induction Loop Position Control

　　5. Impedance Check and Replacement

　　6. Burr Remove

　　Now, we apply our OD 32mm & WT 2mm welding process as an example, the parameters are as below:

　　Strip Size: 2 × 98mm in diameter to expand the bandwidth by adding a small amount of profiling allowance

　　Steel Material: Q235A

　　Input field voltage: 150V excitation current: 1.5A Frequency: 50Hz

　　DC output voltage: 11.5kV DC Current: 4A Frequency: 120000Hz

　　Welding speed: 50 m / min

　　Parameter adjustment: the timely adjustment of output voltage and welding speed according to the welding line energy change. After the fixed parameters generally do not adjust.