电焊机2017，Vol.47Issue(3)：43-48,6.DOI:10.7512/j.issn.1001-2303.2017.03.08
保护气流量对不锈钢激光-MAG复合焊接头组织和性能的影响
Effects of flowrate of shielding gas flow on microstructure and properties of laser-MAG welding-welded joints of stainless steel
韩晓辉 1赵延强 1刘永刚 1沈林 2杨晓益2
作者信息
- 1. 中车青岛四方机车车辆股份有限公司,山东青岛266111
- 2. 西南交通大学材料科学与工程学院,四川成都610031
- 折叠
摘要
Abstract
The laser-MAG hybrid welding was applied to weld the stainless steel with 8 mm thickness.The influence of shielding gas flow (SGF) on weld formation,microstructure and mechanical properties.The results showed that SGF under the test conditions had less effect on the bead shape,the weld microstructure were similar,mainly for branches of columnar austenite grain and small amount of δ-ferrite when other parameters were unaltered.The micro-hardness and impact toughness of joint didn't change obviously with the change of SGF.The tensile strength of the weld would increased with the increase of SGF,and the tensile strength of the welding joint would reach its maximum 765 MPa when the SGF rate was 40 L/min,reaching 86.5％ of the base material.It was found by analyzing tensile fracture of weld,the fracture morphology was similar with the different SGF,fracture morphology of the joint was a dimple pattern with feature of ductile fracture.关键词
不锈钢/激光-MAG复合焊/保护气流量/力学性能Key words
stainless steel/laser-MAG hybrid welding/shielding gas flow rate/mechanical properties分类
矿业与冶金引用本文复制引用
韩晓辉,赵延强,刘永刚,沈林,杨晓益..保护气流量对不锈钢激光-MAG复合焊接头组织和性能的影响[J].电焊机,2017,47(3):43-48,6.
