TC4钛合金T型接头双面双弧MIG焊接特性研究
Study on Characteristics of Double-sided Double-arc MIG Welding of TC4 Titanium Alloy T-joint
高福洋 1崔永杰 2张浩 2鄂楠 1边传新 1余巍1
作者信息
- 1. 中国船舶集团有限公司第七二五研究所,河南 洛阳 471023;先进钛及钛合金材料国家地方联合工程研究中心,河南 洛阳 471039
- 2. 中国船舶集团有限公司第七二五研究所,河南 洛阳 471023
- 折叠
摘要
对 30 mm厚TC4 面板和 15 mm厚TC4 腹板构成的T型角焊缝采用双面双弧MIG方法进行焊接,采用高速摄影对熔滴过渡形态进行了观测,采用数值模拟方法对比了单侧焊接和双面双弧焊接的温度分布,并对双面双弧焊接的焊缝成形进行了观测,对焊接接头组织进行了分析,并对接头显微硬度和拉伸性能进行了测试.结果表明:采用双面双弧MIG焊接可以获得成形良好内部无缺陷的焊接接头.焊接熔滴过渡形式为连续的滴状过渡,过渡过程稳定均匀.双侧焊接时,两侧温度场对称分布.接头冶金结合良好,焊缝组织为粗大的柱状晶,晶粒内部为长针状α'、层片状α和块状α相.面板侧热影响区为残余初生α、层片状α和残余β相.腹板侧热影响区为针状α、层片状α和残余β相.腹板和面板侧热影响区的显微硬度均高于母材.焊接接头抗拉强度达到 969 MPa以上,断裂位置位于母材.
Abstract
The T-shaped fillet weld composed of 30 mm thick TC4 panel and 15 mm thick TC4 web was welded by double-sided double-arc MIG method.The droplet transition morphology was observed by high-speed photography,the temperature distribution of single-sided welding and double-sided double-arc welding was compared by numerical simulation,the weld formation after double-sided double-arc welding was observed,the microstructure characteristics of the welded joint were analyzed,the microhardness and the tensile properties of the joint were tested.The results show that the welded joint with good shape and no internal defects can be obtained by double-sided double-arc MIG welding.The welding droplet transition form is a continuous droplet transition,and the transition process is stable and uniform.When welding at both sides,the welding temperature field of both sides is symmetrically distributed.The metallurgical bonding of the joint is good,the weld zone is coarse columnar crystal,and the interior structure of the grains is long needle α',lamellar α and block α.The heat affected zone at the panel side is residual primary α,lamellar α and residual β.The heat affected zone at the web side is needle shaped α,lamellar α and residual β.The microhardness of the heat affected zone at the web and panel sides is higher than that of the base metal.The tensile strength of the joint reaches more than 969 MPa,and the fracture position is located at the base metal.
关键词
TC4钛合金/T型接头/双面双弧MIG焊接/焊缝成形/显微组织/力学性能Key words
TC4 titanium alloy/T-joint/double-sided double-arc MIG welding/weld forming/microstructure/mechanical property引用本文复制引用
基金项目
郑洛新自创区专项资助项目(201200211400)
出版年
2024
NETL
NSTL
万方数据