The author considers that to prevent the deformation and ensure the welding quality, to rationally determine the tapping location and avoid the holes upon the spiral seam is important.

• 采用灵活的方法,合理确定开孔位置,尽量避免将开口开在焊缝上,同时采用对称焊和间断焊法施焊,可以减小钢管挠曲变形,提高焊接质量。