论述了钛合金钨极氩弧焊时,焊缝受有害气体污染的特征.主要研究了经固态污染或液态污染后,有害气体在焊缝中的分布及对接头力学性能的影响,并采用俄歇能谱、扫描电镜、二次复型等分析手段对焊缝表面组成、焊缝组织及断口形貌进行了分析,提出了焊缝污染的允许程度和控制措施. The characteristics of the welding seam contaminated by the harmful gas are discussed when the TIG welding is performed.This paper mainly studies the distribution of harmful gases in the weld and the influence on the mechanical properties of the joint after solid pollution or liquid pollution, The composition of the weld surface, the microstructure of the weld and the fracture morphology were analyzed by using the method of energy dispersive spectroscopy, scanning electron microscopy, secondary complex analysis and so on. The permissible degree of weld contamination and the control measures were put forward.