Process and Mechanical Properties of Laser-MIG Hybrid Welding Joint of 6082 Aluminum Alloy for Medium and Heavy Plate

Wang Hongguang

doi:10.15980/j.tzzz.2021.05.009

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Process and Mechanical Properties of Laser-MIG Hybrid Welding Joint of 6082 Aluminum Alloy for Medium and Heavy Plate
Vol. 41, Issue 5, Pages: 567-569(2021)
Published： 2021 ，
DOI： 10.15980/j.tzzz.2021.05.009

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Wang Hongguang. Process and Mechanical Properties of Laser-MIG Hybrid Welding Joint of 6082 Aluminum Alloy for Medium and Heavy Plate. [J]. Special Casting & Nonferrous Alloys 41(5):567-569(2021)
DOI：

Wang Hongguang. Process and Mechanical Properties of Laser-MIG Hybrid Welding Joint of 6082 Aluminum Alloy for Medium and Heavy Plate. [J]. Special Casting & Nonferrous Alloys 41(5):567-569(2021) DOI： 10.15980/j.tzzz.2021.05.009.

摘要

采用激光-MIG复合焊工艺对中厚板6082铝合金进行焊接

焊接完成后

对焊缝进行了显微组织观察、硬度测试以及拉伸性能检测。结果表明

当激光功率为4.5 kW

焊接速度为1.2 m/min

离焦量为5 mm

送丝速度为8 m/min时

焊缝表面成形良好;焊缝熔合区显微组织均为等轴枝晶

晶粒较小

热影响区较窄

并且焊缝上部的组织相较于焊缝下部较为细小密集;焊接接头的热影响区硬度较母材和焊缝中心最高;焊缝的平均抗拉强度为251.9 MPa

接近于母材。

Abstract

The laser-MIG hybrid welding process was used to weld 6082 aluminum alloy medium and thick plates. After the welding was completed

the microstructure observation

hardness test and tensile performance test of the weld were carried out. The results show that with the laser power of 4.5 kW

the welding speed of 1.2 m/min

the defocus of +5 mm

and the wire feed speed of 8 m/min

the weld surface presents desirable. The microstructure of the weld fusion zone is uniformly equiaxed dendrites with smaller grains

narrow heat-affected zone

and the structure of the upper part of the weld is smaller and denser than that of the lower part of the weld. Meanwhile

the hardness of the heat-affected zone of the welded joint is higher than that of the base metal and the center of the weld. The average tensile strength of the joint reaches 251.9 MPa

which is close to the base material.