(中国船舶重工集团公司，洛阳 471039)
摘 要: 通过窄间隙TIG自动焊接方法，完成40 mm TA2试板的对接焊接，获得无缺陷的焊缝，对全焊缝厚度进行组织和力学性能检验。结果表明：各层焊缝性能均合格，采用窄间隙焊接方法可以获得优质的焊接接头。先焊区域由于受压缩塑性变形，焊缝的冲击韧性有了明显的提高。并初步分析了冲击韧性提高的原因。
关键字: 钛合金；厚板；焊接接头；组织；冲击韧性
（Luoyang Ship Material Research Institute, Luoyang 471039, China）
Abstract:By the method of narrow gap TIG welding, TA2 plate with a depth of 40 mm and without defects was jointed. The microstructure of the joint was analyzed and the mechanical properties were tested about the whole welding line. The results show that every layer can be eligible and the TA2 joints welded by narrow gap TIG welding are of high-quality. Furthermore, the impact toughness of welding joints in the areas of welded foregoing increase obviously because of being compressed, leading to plastic distortion. The reasons that the impact toughness can be increased were analyzed also.
Key words: titanium alloy; thick plate; welding joint; microstructure; impact toughness
