摘要
采用多层多道TIG焊实现了20 mm厚TA22/TA2异种钛合金板的有效连接,焊缝呈亮银色,有明显的鱼鳞纹,成型美观。经焊缝低倍组织检测未发现气孔、未熔合、裂纹等缺陷。TA22热影响区的组织主要是晶界α相和片状α相组成的魏氏组织,靠近熔合线的焊缝区为粗大的板条状α相组织;焊缝区、TA2侧热影响区组织均为锯齿状晶界的块状α相,且从焊缝区到母材区的块状α相尺寸逐渐减小。焊缝区打底层的硬度最高,填充层的硬度值较低,焊缝表面处的硬度略有上升;从TA22母材至焊缝区的硬度先增加后急剧下降;从TA2母材区至焊缝区的硬度略微降低。力学性能测试结果显示,接头的平均抗拉强度为501.5 MPa,断裂发生在TA2侧母材;侧面弯曲未发现裂纹产生,接头的力学性能优良。
The effective connection of TA22/TA2 dissimilar titanium alloy plate with thickness of 20 mm was realized by multi-layer multi-pass TIG welding.The weld morphology is bright silver with obvious fish scale pattern,and the weld shape is beautiful.Through macrostructure detection of the weld,the joint has no defects such as porosity,incomplete fusion and crack.The microstructure of TA22 heat affected zone is mainly Widmannstatten structure composed of grain boundaryαand sheetα.The weld zone near the fusion line is coarse lathαphase structure.The microstructure of weld zone and TA2 side heat affected zone are blockyαphase with zigzag grain boundary,and the size of blockyαphase from weld zone to base metal zone gradually decreases.The hardness of backing layer in weld zone is the highest,the hardness of filler layer is lower,and the hardness of weld surface increases slightly.The hardness from TA22 base metal to weld zone first increases and then decreases sharply.The hardness from TA2 base metal to weld zone decreases slightly.The mechanical property test results show that the average tensile strength of the joint is 501.5 MPa,and it breaks in base metal zone of TA2.No crack is found in the side bending test,and the mechanical property of the joint is excellent.
作者
马照伟
李彦默
刘甲
雷小伟
符成学
崔永杰
田德厚
MA Zhaowei;LI Yanmo;LIU Jia;LEI Xiaowei;FU Chengxue;CUI Yongjie;TIAN Dehou(Luoyang Ship Material Research Institute,Luoyang 471039,China)
出处
《热加工工艺》
北大核心
2021年第21期42-45,49,共5页
Hot Working Technology
关键词
异种钛合金
TIG焊
微观组织
力学性能
硬度
dissimilar titanium alloy
TIG welding
microstructure
mechanical property
hardness
