Defects that are easy to produce in the submerged arc welding zone are pores, hot cracks, and undercuts.

Hot rolling is relative to cold rolling. Cold rolling is rolling below the recrystallization temperature, while hot rolling is rolling above the recrystallization temperature.

Forged pipe fittings are a product with good mechanical properties in flange products. Its raw material is generally a pipe blank, which is then cut and then continuously beaten to eliminate defects such as segregation and looseness in the steel ingot.

In the welding operation of stainless welded steel pipe manufacturers, the market faces three common problems: unqualified seams, incomplete penetration or burned through, cracks and pores.

High-frequency welding is a kind of induction welding (or pressure contact welding). It does not require weld fillers, no welding spatter, narrow welding heat-affected zone, beautiful welding shape, good welding mechanical performance and other advantages.

Only by controlling the quality of longitudinally welded pipes can production operations be carried out safely, which is also an inevitable element to ensure the personal safety of operators.