TA2纯钛板钨极氩弧焊接接头组织与性能

本文研究了不同焊接工艺下焊缝及热影响区的微观组织特征，以分析焊接接头的力学性能。结果表明焊缝组织为锯齿状α相、板条α相及少量针状马氏体，并得到焊接最佳工艺为焊接电流85A，焊接速度0．5cm／s，主喷嘴氩气流量20L／min，拖罩氩气流量12L／min，双面焊接。此焊接工艺下得到的焊接接头抗拉强度达到母材的99．55％，延伸率达到母材的70％。文中还探讨了焊后热处理对焊接组织与性能的影响，结果表明焊后热处理可以提高焊接接头的塑性，可以调整焊接接头的综合力学性能，使其达到使用标准。

Microstructure and Mechanical Properties of TIG Welded Joint of TA2

The mierostrueture and mechanical properties of the weld metal and heat affected zone under different welding process characteristics were investigated. The results show that the weld metal serrated a phase, lath α phase and a small amount of acicular martensite, and the best welding process for the welding current is 85A, welding speed of 0. 5cm / s, the main nozzle argon gas flow of 20L/min, drag the cover of argon gas flow of 12L/min, double--sided welding. The tensile strength of welded joints in the welding process achieves 99. 55% of the base metal, and the extension rate achieves 70% of the base metal. The paper also explored the impact of the post--weld heat treatment on the organization and performance of welding. Results show that the post--weld heat treatment can improve the plasticity of the welded joints, and the mechanical properties of welded joints can he adjusted to achieve the using standard.