This new method not noly prevents the shortcomings in the past, three or four cold tack-weld spots and complex operation, but can effectively improve the quality of the steel pipe butt welding and simplify the operation process.

• 该方法克服了以往三点点固和四点点固法冷焊点多，操作复杂的缺点，有效地提高了钢管对焊质量，大大减化了操作过程。