铁路货车车厢焊接修复时焊缝开裂分析

Analysis on cracks occurred in welding repair of railway freight cars

针对铁路货车车厢在焊接修复过程中存在的焊缝开裂问题进行原因分析,从焊接引弧处的脆性组织、焊接拘束应力、焊缝结构设计、焊材结构选用、焊缝金属中的扩散氢含量,近缝区母材表面的锈蚀、氧化物对焊接质量的影响等方面入手,提出了铁路货车车厢焊接修复的工艺过程与方法。对提高货车车厢修复质量有良好的指导意义。

The causes of weld cracking in the welding repair process of railway freight cars are analyzed.The brittle structure,welding restraint stress,weld structure design,welding material structure selection,and diffusion hydrogen content in the weld metal are obtained from the welding arc.The corrosion of the surface of the base material in the near seam area and the influence of oxide on the welding quality were analyzed.The process and method of welding and repairing the railway freight car compartment were put forward.It has a good guiding significance for improving the repair quality of truck compartments.