2.5mm厚TC4钛合金搅拌摩擦焊的成形规律研究  

Research on Forming Law of 2.5 mm Thick TC4 Titanium Alloy Friction Stir Welded Joints

作　　者：王月[1,2] 姬书得[1] 李继忠[2] 陈振中[1] 温泉[1] 

机构地区：[1]沈阳航空航天大学航空航天工程学部,辽宁沈阳110136 [2]北京航空制造工程研究所,北京100024

出　　处：《热加工工艺》2016年第15期171-176,共6页Hot Working Technology

基　　金：国家自然科学基金资助项目(51204111);辽宁省自然科学基金资助项目(2014024008);航空基金资助项目(2014ZE54021)

摘　　要：使用轴肩直径为20 mm的钨铼合金搅拌头,采用三组不同的焊接参数对2.5 mm厚TC4钛合金进行了搅拌摩擦焊接试验。试验结果表明:搅拌头的形貌决定焊缝的横截面,即碗形;焊缝中出现了明显的热机影响区,材料向上迁移量随到焊缝距离的增加而减小。当固定焊速(50 mm/min)时,采用较小转速有利于孔洞缺陷的减小,这与不同焊接热输入引起的焊接拉应力密切相关。Under three different parameters, 2.5 mm thick TC4 titanium alloy was friction stir butt welded by W-Re pin tool with shoulder diameter of 20 mm. The experimental results show that the shape of tool decides the cross section of the joint, that is to say, ＂basin＂ shape. There obviously exists thermo-mechanically affected zone （TMAZ） in the welding joint, while the upward displacement of material in TMAZ decreases with the distance to weld zone increasing. Under the constant welding speed （50mm/min）, the lower rotational speed is beneficial to decreasing the hole defect, which is closely related to welding tensile stress resulting from different welding thermal inputs.

关 键 词：搅拌摩擦焊 TC4钛合金 孔洞 热机影响区 

分 类 号：TG453.9[金属学及工艺—焊接]