螺旋埋弧焊管内焊应力热裂缝产生的机理和防止方法

The Preventative Method and Mechanism Produced by Stress Heat Cracking to Inside Welding of Spiral Submerged Arc Welded Pipe

螺旋埋弧焊钢管内焊缝裂纹是本行业多年未解决的问题。从焊缝结晶冷却收缩应力和变形张应力两个方面着重分析了裂纹产生的机理和防止方法，并提出了解决措施。

Inside welding seam cracking of spiral submerged Arc welded pipe is the unsolved problem for many years in the pipe field. This paper analyses the machanism produced by cracking and preventative method from both weld seam crystallization cooling contraction stress and deformation stress and puts forward the solving measures.