中厚板铝合金激光-MIG复合焊接工艺及组织性能

马国龙; 马寅; 李帅贞; 杨志斌; 韩晓辉

doi:10.7512/j.issn.1001-2303.2024.09.03

轨道车辆高性能焊接制造 | 浏览量 : 0 下载量: 3 CSCD: 0

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中厚板铝合金激光-MIG复合焊接工艺及组织性能
Process and Microstructure Properties of Laser MIG Hybrid Welding for Medium-thick Aluminium Alloy Plate
2024年54卷第9期页码：24-29
纸质出版日期： 2024-09-25 ，
DOI： 10.7512/j.issn.1001-2303.2024.09.03
稿件说明：

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马国龙，马寅，李帅贞，等.中厚板铝合金激光-MIG复合焊接工艺及组织性能［J］.电焊机，2024，54（9）：24-29.

MA Guolong, MA Yin, LI Shuaizhen, et al.Process and Microstructure Properties of Laser MIG Hybrid Welding for Medium-thick Aluminium Alloy Plate[J].Electric Welding Machine, 2024, 54(9): 24-29.
马国龙，马寅，李帅贞，等.中厚板铝合金激光-MIG复合焊接工艺及组织性能［J］.电焊机，2024，54（9）：24-29. DOI： 10.7512/j.issn.1001-2303.2024.09.03.

MA Guolong, MA Yin, LI Shuaizhen, et al.Process and Microstructure Properties of Laser MIG Hybrid Welding for Medium-thick Aluminium Alloy Plate[J].Electric Welding Machine, 2024, 54(9): 24-29. DOI： 10.7512/j.issn.1001-2303.2024.09.03.

摘要

针对8 mm厚6005A-T6铝合金，分别采用I形坡口和Y形坡口进行激光-MIG复合焊接试验，通过对比研究不同坡口形式接头的焊缝成形、组织特征、硬度分布和拉伸性能，分析坡口形式对接头性能的影响规律。结果表明，两种坡口形式均能获得高质量的焊缝，但I形坡口焊缝的电弧主要作用区熔深更大。焊缝中心均为树枝状晶并且晶粒尺寸类似，与Y形坡口相比，I形坡口焊缝柱状晶区的宽度更大，且热影响区存在晶粒粗大的现象。I形坡口焊缝区和熔合线附近的硬度均低于Y形坡口，而热影响区的硬度高于Y形坡口。I形坡口和Y形坡口接头的平均抗拉强度分别为202.0 MPa和205.2 MPa，试样均断裂在熔合线附近，断裂路径与熔合线一致，断口呈现典型的塑性断裂特征。

Abstract

In this paper

laser-MIG hybrid welding experiments were carried out on the 8mm thick 6005A-T6 aluminum alloy. The weld formations

microstructures

microhardness distributions and tensile properties with different groove shapes were comparative studied. The results indicated that both I-shape and Y-shape grooves could obtain high quality welds

but the arc action zone penetration of I-shape groove was larger. The weld centers of I-shape and Y-shape grooves were dendritic and had similar grain size. Compared with Y-shape groove

the columnar crystal zone width of I-shape groove weld was larger than that of Y-shape groove

and the grain size in the heat-affected zone of I-shape groove weld was coarse. The microhardness values in the weld zone and near the fusion of I-groove shape were both lower than those of Y-shape groove

and the microhardness of heat-affected zone was higher than that of Y-shape groove. The average tensile strengths of I-shape and Y-shape joints were 202.0 MPa and 205.2 MPa

respectively. The samples fractured near the fusion line

and the fracture paths were consistent with the fusion line. The fracture showed typical plastic fracture features.

关键词

铝合金激光-MIG复合焊坡口形式焊缝成形组织性能

Keywords

aluminum alloylaser-MIG hybrid weldinggroove shapeweld formationmechanical properties

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