裂縫是焊接接头中最严重的缺陷,無論多么輕微的裂縫也是不容許存在的。通常,裂縫是由于焊縫金属或基本金屬的塑性过低,以及焊件存在的內应力过大所产生的。具体說来,焊接裂縫产生的原因是多方面的,首先是焊縫布置不合理。事实上,許多焊接結構的破坏不是因为操作不好,而是由于結構本身的缺陷所引起的。焊接結構中的焊縫布置不合理,主要表现在以下几方面: Cracks are the most serious defects in welded joints, no matter how slight cracks are not allowed to exist. Fractures are usually caused by too much plasticity of the weld metal or base metal and excessive internal stresses in the weldment. Specifically, the reasons for welding cracks are many, first and foremost, the welding seam layout is unreasonable. In fact, many of the damage to the welded structure is not due to poor handling, but due to defects in the structure itself. Welding structure of the weld layout is not reasonable, mainly in the following areas: