Piping systems are the arteries of our industrial processes and the contribution of piping systems are essential in an industrialized society.

The welding process is as follows:①Check whether the connection between the workpiece and the ground wire, welding torch, wire feeder, gas cylinder, barometer, air pipe, etc. is accurate and reliable. If there is a large (small) current file on the panel, use a small current file for voltages below 5 files.

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.