ERW Pipe Manufacturing Process

Steel plate blanking and pretreatment

When cutting steel plate, the machining allowance is reserved, which is completed by numerical control cutting machine or steel beam cutting machine.

After cutting, it is necessary to clean up the molten tumor and burr, ensure that the board surface is clean, and prevent subsequent processing damage.

Roll forming (mainstream technology)

The steel plate is rolled into shape by numerical control plate bender, and the bending radius is adjusted to the design value by pressing head preloading.

After rolling, it is necessary to cut off the straight section and the gradual opening section to ensure good roundness at the joint and avoid peach tip phenomenon.

welding technology

The longitudinal seam is welded by automatic submerged arc welding machine, and the sequence is from outside to inside to prevent welding delay crack.

Pre-heating is required before welding (temperature is controlled according to specifications), and post-heat treatment is carried out after welding to reduce the cooling rate of heat affected zone.