TC4钛合金激光-MIG复合焊接研究
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摘要
通过激光-MIG复合热源焊接参数优化,获得15 mm厚钛合金对接焊接接头,利用金相分析、拉伸试验和显微硬度对焊接接头的显微组织和力学性能进行研究。结果表明:坡口角度60°,钝边5 mm焊接过程最稳定,打底层焊缝熔深和熔宽随激光功率和焊接电流的增加而增加,随焊接速度的增加而减小;采用摆动焊接进行填充和盖面,焊接过程熔滴过渡稳定,无焊接缺陷,焊缝由单一的α'马氏体组成,热影响区显微组织为初生α相和α'马氏体;接头抗拉强度高于母材,断后伸长率为11.5%,略低于母材,拉伸试样断裂在母材处。焊缝区显微硬度最高,热影响区居中,母材最低。
The butt welded joint of 15 mm thick titanium alloy was obtained by optimizing the parameters of laser?MIG combined heat source welding. The microstructure and mechanical properties of welded joints were analyzed by metallographic analysis,tensile test and microhardness measurement. The results show that when the groove angle is 60 degrees,the 5 mm welding process is the most stable. The penetration depth and width of bottom weld increase with the increase of laser power and welding current,and decrease with the increase of welding velocity. Swinging welding is used to fill and cover the surface,the droplet transfer process is stable and no welding defects are found during welding. The weld area is composed of a single α′ martensite,and the microstructure of heat affected zone is primary α phase and α′ martensite. The tensile strength of the joint is higher than that of the base metal,and the elongation after fracture is 11.5%,which is slightly lower than that of the base metal. The tensile specimen is broken at the base metal. The microhardness of the weld zone is the highest,followed by the heat affected zone,and the lowest is the base metal.
The butt welded joint of 15 mm thick titanium alloy was obtained by optimizing the parameters of laser?MIG combined heat source welding. The microstructure and mechanical properties of welded joints were analyzed by metallographic analysis,tensile test and microhardness measurement. The results show that when the groove angle is 60 degrees,the 5 mm welding process is the most stable. The penetration depth and width of bottom weld increase with the increase of laser power and welding current,and decrease with the increase of welding velocity. Swinging welding is used to fill and cover the surface,the droplet transfer process is stable and no welding defects are found during welding. The weld area is composed of a single α′ martensite,and the microstructure of heat affected zone is primary α phase and α′ martensite. The tensile strength of the joint is higher than that of the base metal,and the elongation after fracture is 11.5%,which is slightly lower than that of the base metal. The tensile specimen is broken at the base metal. The microhardness of the weld zone is the highest,followed by the heat affected zone,and the lowest is the base metal.
引文
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[3]黄锋,赵刚要,帅歌旺,等.TC4钛合金高真空电子束焊接工艺研究[J].热加工工艺,2018,47(3):53-56.
[4]韩旭.TC4钛合金A-TIG焊接接头组织与性能研究[D].内蒙古:内蒙古工业大学,2017:5-6.
[5]李双.钛合金TC4中厚板窄间隙TIG焊接工艺技术研究[D].沈阳:沈阳工业大学,2018:3-4.
[6]李亚江,王娟,等.特种焊接技术及应用[M].北京:化学工业出版社,2014:21-29.
[7]高明,曾晓雁,严军,等.激光-电弧复合焊接的热源相互作用[J].激光技术,2007,31(5):465-468.
[8]马志华,陈东高,谭兵,等.5052铝合金CO2激光-MIG复合焊接工艺对焊缝成形的影响[J].兵器材料科学与工程,2012(2):76-80.