电焊机2025，Vol.55Issue(8)：74-82,9.DOI:10.7512/j.issn.1001-2303.2025.08.08
7A52铝合金摆动激光-电弧复合送丝熔覆修复工艺研究
Research on the Oscillating Laser-arc Hybrid Wire-feeding Cladding of 7A52 Al Alloy for Repairing
黄浩 1王程远 2肖玉斌 1赵飞 1梁志强 3姜成云 2张子钺 2熊凌达 4杜宇超 4刘宝隆4
作者信息
- 1. 江麓机电集团有限公司,湖南 湘潭 411100
- 2. 北京石油化工学院 机械工程学院,北京 102617
- 3. 北京理工大学 机械与车辆学院,北京 100081||北理工郑州智能科技研究院,河南 郑州 450000
- 4. 北京理工大学 机械与车辆学院,北京 100081
- 折叠
摘要
Abstract
7A52 aluminum alloy components are prone to cracking under periodic high-impact loads during service.Wire feeding melting is an effective method to repair such cracks.To achieve high-quality repairs,a laser-arc hybrid wire feeding melting process is proposed,using 7A48 welding wire to repair the 7A52 aluminum alloy with a 6 mm groove.The research results show that the melting layer has good fusion with the bottom and side walls of the groove,with a cross-sectional po-rosity rate as low as 0.067%,and good macroforming quality.In the microstructure,from the fusion line to the center of the melting layer,it presents fine-grained zone,columnar grain zone,and equiaxed grain zone in sequence.Due to the stirring and dendrite breaking effect of the oscillating laser on the melt pool,the width of the columnar grain zone is only 180 μm,with obvious grain refinement effect,and the grain growth direction is consistent,pointing from the edge of the melting layer to the top center.From the base material to the top of the melting layer,the mass fractions of the alloy strengthening el-ements Mg and Zn decrease by 8.6%and 34.9%respectively due to high temperature burning,and the melting of the melt pool causes the original rolling state microstructure and work hardening effect in the base material to disappear,resulting in the hardness of the melting layer dropping to 103～112 HV,lower than the base material.The average tensile strength of the melting layer reaches 320.9 MPa,the average elongation rate is 7.0%,and the fracture is characterized by ductile fracture,with a small amount of small pores and 4～10 μm dimples.This study has achieved reliable repair of 7A52 aluminum alloy through the oscillating laser-arc hybrid process.The innovation lies in the use of oscillating laser to collaboratively regulate the flow of the melt pool and the growth of grains,effectively reducing the porosity rate and refining the structure,providing a new process path for the repair of high-strength aluminum alloy cracks.关键词
7A52铝合金/裂纹修复/激光-电弧复合送丝熔覆/摆动激光Key words
7A52 Al alloy/repairing/laser-arc hybrid wire-feeding cladding/oscillating laser分类
矿业与冶金引用本文复制引用
黄浩,王程远,肖玉斌,赵飞,梁志强,姜成云,张子钺,熊凌达,杜宇超,刘宝隆..7A52铝合金摆动激光-电弧复合送丝熔覆修复工艺研究[J].电焊机,2025,55(8):74-82,9.
