国产与进口5183焊丝及焊接接头组织与性能

采用国产与进口5183焊丝作为填充丝对5083-O状态合金板材实施MIG焊接.利用金相观察、拉伸性能测试、扫描电镜观察等方法研究了焊丝及焊接接头的显微组织与力学性能.结果表明:与进口5183焊丝相比，国产5183焊丝屈服强度较高，延伸率略低；在所选的焊接工艺参数条件下，MIG焊可以获得焊缝质量良好的焊接接头；两种焊丝焊接的接头各区组织基本相同，焊缝区是典型的急冷结晶的铸态组织；热影响区晶粒呈现出了沿轧制方向伸长变形的特点，部分析出相固溶到基体中.使用两种焊丝焊接的接头抗拉强度都达到基材的85%以上.

Microstructure and Mechanical Properties of Wire and Welded Joints Using Domestic and Imported 5183 Welding Wire

5083-O alloy plates were welded by metal inert gas (MIG) welding method using domestic and imported 5183 welding wire. The microstructures and mechanical properties of wire and welded joints were studied by optical microscopy, tensile test methods and SEM. The results showed that the domestic 5183 wire has higher yield strength and slightly lower elongation than that of the imported 5183 wire. Weld beads are fairly good under the chosen welding parameters. The microstructures of welded joints using domestic and imported 5183 welding wire are similar. The weld zone is the typical casting structure formed during weld solidification. Grains are elongated along the rolling direction and parts of precipitated phases dissolve in the matrix in the heat-affected zone. The tensile strength of the joints welded with either domestic or imported 5183 welding wire can reach more than 85% of the base material.