There will be some defects in the welding process of the rusty steel welded pipe, and the defects of the stainless steel welded pipe will lead to stress concentration, reduce the bearing capacity, shorten the service life, and even cause brittle fracture. According to the general technical regulations, cracks, non-penetration, non-fusion and surface slag inclusion are not allowed; Defects such as biting edge, internal slag inclusion and porosity cannot exceed a certain allowable value, and excessive defects must be completely removed and welded. Causes, hazards and prevention measures of welding defects of common stainless steel welded pipes.

   This time we learn about the arc pit problem in the welding process. The sinking part generated at the end of the weld of the sanitary stainless steel welded pipe is called the arc pit. The arc pit not only weakens the strength of the weld, but also causes the arc pit crack due to the concentration of impurities.

   The main reason of the crater is that the quenching residence time is too short. The current is too large when the sheet is welded; The arc quenching time at the end of welding is too short. Strengthening technical operation is a necessary course in welding learning.

   The prevention methods for the arc pit are as follows: select the appropriate welding current and welding speed; Adopt the correct arc retraction method; Use arc absorbing current or arc absorbing plate; Repair the crater that has been created.

Related: stainless steel pipe production line, high-speed welded steel pipe production line

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