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TATM700钢等离子-MIG复合焊接工艺
张洪涛1, 桑健1, 王琪晨2, 滕瑶2, 张文杰3
1.哈尔滨工业大学(威海), 威海 264209;2.中集海洋工程研究院有限公司, 烟台 264000;3.威海东海船舶修造有限公司, 威海 264209
摘要:
采用等离子-MIG复合焊接设备对12.5 mm厚的汽车结构件低合金高强度TATM700大梁钢进行了焊接工艺研究,分析了不同坡口形式下焊缝成形、焊缝组织及力学性能,并与药芯焊丝多层多道手工TIG焊的方法进行了对比. 结果表明,坡口形式对等离子-MIG复合焊接焊缝影响较小. 复合焊焊缝成形良好,截面形状合理. 焊缝组织由少量的侧板条铁素体和大量的针状铁素体构成. 接头强度和弯曲性能均优于手工TIG焊接,抗拉强度达到了母材的95%,但硬度略低于多层多道手工TIG焊接.
关键词:  等离子-MIG  复合焊  焊缝组织  力学性能
DOI:10.12073/j.hjxb.2019400307
分类号:TG456.2
基金项目:泰山学者青年专家支持计划(tsqn20161062);哈尔滨工业大学科研创新基金(HIT.NSRIF.201707);山东省重点研发计划(2018GGX103032);山东省自然科学基金(ZR2018MEE027)
Research on plasma-MIG hybrid welding process of TATM700 steel
ZHANG Hongtao1, SANG Jian1, WANG Qichen2, TENG Yao2, ZHANG Wenjie3
1.Harbin Institute of Technology at Weihai, Weihai 264209, China;2.CIMC Marine Engineering Research Institute Co., Ltd.,Yantai 264000, China;3.Weihai Donghai Shipyard Co., Ltd, Weihai 264209, China
Abstract:
Process research on 12.5 mm thick low alloy high strength TATM700 girder steel for automobile structural parts was studied by plasma-MIG hybrid welding equipment. The weld formation, weld microstructure and mechanical properties under different groove forms were analyzed. Furthermore, it compared with the multi-layer manual TIG method of flux cored wire. The results showed that the groove form has less influence on the plasma-MIG composite welding seam. The sample welded by the composite welding method is well formed and the cross-sectional shape is reasonable. The weld structure consists of a small amount of side slab ferrite and a large number of acicular ferrite. The joint strength and bending performance are better than manual TIG welding, the tensile strength reaches 95% of the base metal, and the hardness is slightly lower than the multi-layer multi-channel hand-welded TIG welding sample.
Key words:  plasma-MIG  composite welding  weld microstructure  mechanical properties