Generally, the welding part needs to undergo heating-melting-metallurgical reaction-solidification crystallization-solid phase transformation-formation of joints and other processes.

In the process of steel pipe welding, there are many precautions. If you neglect it, you may make a big mistake. The welding construction does not pay attention to selecting the appropriate voltage, whether it is for bottoming, filling, or covering, regardless of the size of the groove, choose the same In this way, the required penetration depth and penetration width may not be reached, and defects such as undercut, porosity, and spatter may occur.

In high-frequency longitudinally welded pipes(ERW steel pipe), the manifestations of cracks include long cracks, local periodic cracks and irregular intermittent cracks.

From the manufacturing process and product characteristics, the formation of a thin oxide film on the surface of thick-walled seamless pipes prevents oxidation.

The stainless steel welded pipe is welded by steel strips. The welded pipe has a uniform wall thickness, high brightness inside and outside the pipe, and can be made into a thin-walled pipe.

Analysis of problems encountered The problems usually encountered in the piling process of micro steel pipe pile are: ①Failed to hit the design depth; ② The pile body is damaged; ③Although it has reached the design depth, it cannot be stopped; ④ The deviation or inclination of the pile exceeds the allowable value; ⑤Compared with the record of foundation survey or test pile, the driving condition ...