There will be some defects in the welding process of stainless steel welded pipe, and the defects of 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.

     Here we first understand the problem of non-fusion in welding. Non-fusion refers to the part between the weld pass and the base material or between the weld pass and the weld pass that is not completely melted. Non-fusion directly reduces the mechanical properties of the joint, and serious non-fusion will make the welded structure unable to bear the load.

     Explore the cause of non-fusion. The welding speed is fast and the welding current is small when welding stainless steel welded pipe, and the welding heat input is too low; Electrode eccentricity, improper Angle between electrode and weldment, arc direction deflection; There are rust and dirt on the side wall of the groove, and the cleaning slag between layers is not thorough.

     The improvement measures are to correctly select the welding process parameters, carefully operate, strengthen the cleaning between layers, and improve the technical level of equipment operators and welders.

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

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