激光-MIG焊接工艺参数对低成本钛合金焊缝成形的影响  

Effect of laser-MIG welding parameters on formation of low-cost titanium alloy weld

作　　者：刘政 高金良[1] 宋旭杰 冯和永[1] 万鹏 李宏伟[1] 高秋华 Liu Zheng;Gao Jinliang;Song Xujie;Feng Heyong;Wan Peng;Li Hongwei;Gao Qiuhua(Beijing North Vehicle Group Co.,Ltd.,Beijing 100072,China)

机构地区：[1]北京北方车辆集团有限公司,北京100072

出　　处：《焊接》2024年第12期74-80,共7页Welding & Joining

摘　　要：【目的】旨在研究不同焊接工艺参数下打底焊缝与盖面焊缝的成形规律,探索最佳打底层与盖面层焊接工艺参数。【方法】以10 mm厚钛合金(TC4LCA)板为母材,使用激光-电弧复合焊接工艺方法,进行打底焊和盖面焊,并对焊接接头进行宏观形貌分析及力学性能测试。【结果】结果表明,在坡口形式为Y形,坡口角度60°,钝边厚度为4 mm,光丝间距为4 mm,激光功率3.0 kW,焊接速度1 m/min,MIG电弧电流为150 A的条件下,能够获得成形良好的打底层焊缝;在激光功率为1.0 kW,焊接速度为0.6 m/min,MIG电弧电流为200 A的条件下,两次填充能够获得成形良好的盖面层焊缝,接头未发现裂纹、气孔、夹渣等缺陷。【结论】采用激光-MIG焊接方法得到的接头强度较高,达到母材强度的97.8%。[Objective]The purpose was to study forming regularity of backing weld and covering weld under different welding parameters and explore optimal welding parameters for backing layer and covering layer.[Methods]Taking titanium alloy(TC4LCA)plate with 10 mm thickness as base material,laser-arc hybrid welding process was used for backing welding and covering welding,and macroscopic morphology analysis and mechanical performance test was carried out on welded joints.[Results]The results showed that under the conditions of 60°Yshaped groove,4 mm blunt edge thickness,4 mm spacing between laser and wire,3.0 kW laser power,1 m/min welding speed and 150 A MIG arc current,a well formed backing weld could be obtained.Under the conditions of 1.0 kW laser power,0.6 m/min welding speed and 200 A MIG arc current,a well formed covering weld could be obtained by filling twice.No cracks,porosity,slag inclusion or other defects were found in welded joints.[Conclusion]Strength of welded joints obtained by laser-MIG hybrid welding method was high,reaching 97.8%that of base metal.

关 键 词：TC4LCA 激光-MIG复合焊 焊缝组织 力学性能 

分 类 号：TG442[金属学及工艺—焊接]