| A7N01铝合金激光-MIG复合焊接焊缝成形与组织性能研究 |
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| 引用本文： | 侯艳喜,罗子艺,易耀勇,徐荣正,哈斯金·弗拉基斯拉夫.A7N01铝合金激光-MIG复合焊接焊缝成形与组织性能研究[J].激光技术,2020,44(3):304-309. |
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| 作者姓名： | 侯艳喜 罗子艺 易耀勇 徐荣正 哈斯金·弗拉基斯拉夫 |
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| 作者单位： | 1.沈阳航空航天大学 材料科学与工程学院, 沈阳 110136 |
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| 基金项目： | 广东省科学院实施创新驱动发展能力建设专项资助项目;广东省科技计划 |
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| 摘 要： | 为了研究工艺参量对激光-MIG复合焊接的焊缝成形和组织特征及性能的影响，针对6mm的A7N01铝合金板，采用不同的激光功率、焊接速率和坡口形式，进行了激光-MIG复合焊接试验，观察焊缝成形及接头微观组织，并对其性能进行测试。采用Y型30°坡口，在激光功率3.0kW、焊接速率1.0m/min的参量下进行激光-MIG复合焊接时，焊缝表面成形良好，底部成形连续；接头平均抗拉强度为271MPa，达到母材的60%；焊缝中心硬度为85.4HV，达到母材的78%。结果表明，随着激光功率的提高，焊缝熔深呈线性增大；焊接速率越大、焊缝熔宽和熔深越小，余高略有增加；焊接接头对不同坡口形式的适应性良好；接头中热影响区晶粒粗化，硬度降低，熔合区晶粒为树枝晶，易产生工艺类氢气孔，焊缝中心晶粒为等轴晶。该研究有利于获得成形良好的A7N01铝合金激光-MIG复合焊接头。
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| 关 键 词： | 激光技术 激光-MIG复合焊接 A7N01铝合金 焊缝成形 力学性能 |
| 收稿时间： | 2019-05-20 |
Study on weld formation and microstructure of A7N01 aluminum alloy by hybrid laser-MIG welding |
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| Abstract: | In order to study the effect of process parameters on weld formation, microstructure characteristics, and properties of the joint welded by laser-melt inert-gas (MIG) hybrid welding, laser-MIG hybrid welding of 6mm A7N01 aluminum alloy plates was carried out with different laser powers, welding speeds, and groove forms. The microstructure and properties of the joints were observed and tested. The results show that as the laser power increases, the weld penetration increases linearly. Furthermore, the higher the welding speed, the smaller the weld width and the penetration depth, and the margin is slightly increased. The welded joints have good adaptability to different groove forms. When the hybrid laser-MIG welding was carried out with the laser power of 3.0kW, welding speed of 1.0m/min, and the Y-shaped 30° groove, the sound joint was obtained. The average tensile strength of the joint is 271MPa, which is 60% of the base metal. The center hardness of the weld is 85.4HV, which is 78% of the base metal. In the joint, the grain in the heat-affected zone is coarsened, the hardness is reduced, and the grain in the fusion zone is dendritic grain, which is easy to produce hydrogen holes in the process. In addition, the grain is equiaxed at the center of weld. This research is conductive to obtaining a well-formed laser-MIG hybrid welding joint of A7N01 aluminum alloy. In addition, the grain is equiaxed at the center of weld. |
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