| 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） |
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| Research on plasma-MIG hybrid welding process of TATM700 steel |
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ZHANG Hongtao1, SANG Jian1, WANG Qichen2, TENG Yao2, ZHANG Wenjie3
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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
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| 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 |
