The pre-welding process of straight seam steel pipe requires strict control of weld quality. First, the misalignment of the seam should be less than 8% of the plate thickness, and the maximum should not exceed 1.5mm; secondly, the weld should have appropriate penetration and deposition to avoid cracking or burning through, and ensure that the weld height is reasonable. The weld should be formed continuously, and the weld should not have defects such as deviation, pores, cracks, etc. The center deviation should be ≤1mm. At the same time, arc burns should be avoided, spatter should be reduced, and the pipe end groove and surface should not be affected. Finally, the physical and chemical properties of the weld and the parent material should match to ensure the strength and durability of the overall steel pipe. To learn more, please visit the website: https://www.nan-steel.com/