In order to better control the quality of welds, the concept of inclusion weld crack index. Mainly weld strength, ductility humanoid or shortage caused. When there is the impact toughness of small inclusions seam welding, only when the two relatively close to the wall of the steel pipe crushed metal, weld cracking is likely to emerge. To reduce weld cracking, the need to improve the toughness of the weld, the weld reduce inclusions. So how to reduce the weld inclusions it?
First, to improve the purity of the raw material, reducing P, S content, reduced content of inclusions. Second, check the strip edge bumps, whether stained with rust, dirt, these are not conducive to the discharge of molten metal, is likely to cause the weld inclusions. Again, uneven thickness, glitches and drum kits are likely to cause fluctuations in the welding current, affecting the quality of welding.
