But the thickness of the coatings may be heterogeneous since the effect of the weld residual high during coating spiral-welded pipes, which will influence the service life of the coated pipe line.

• 但在螺旋焊缝钢管涂敷过程中，由于受到焊缝馀高的影响，防腐层可能会出现厚薄不均的现象，这将影响防腐管道的寿命。