林茜1  许敏1  朱雯静1  李文强1  姚屏1,2  梁道赞3

（1.广东技术师范大学机电学院，广东 广州 510630

2.广州理工学院，广东 广州 510000

3.广东奇正科技有限公司，广东 阳江 529932）

摘要：目的：为提高工业机器人铝合金双脉冲MIG焊焊接质量，探究频率匹配占空比对焊接质量的影响，获得焊接效果较好的工艺参数。方法：采用双脉冲MIG焊对3 mm厚的ER6061铝合金板材进行焊接，观察焊缝表面成形，分析焊接接头几何形状、焊接电信号和金相组织。结果：在电流70 A、焊接速度40 cm/min、峰基比50%条件下，频率为2 Hz、占空比为30%时，焊缝表面成形良好，无咬边、塌陷现象，电信号稳定，可实现稳定焊接；结论：固定频率为2 Hz时调节占空比，熔宽、熔深随占空比的增大变化较明显；固定占空比为30%时调节频率，焊接效果较好；为铝合金焊接技术工艺参数匹配及提高焊接质量提供参考与借鉴。

关键词：双脉冲MIG焊；频率；占空比；焊缝接头几何形状；焊缝成形；焊接电信号；金相组织

中图分类号：TG444+74         文献标志码：A            文章编号：1674-2605(2023)04-0007-09

DOI：10.3969/j.issn.1674-2605.2023.04.007

Effect of Matching Process Parameters on Welding Seams of Industrial Robot Aluminum Alloy Double Pulse MIG Welding

LIN Qian1  XU Min1  ZHU Wenjing1  LI Wenqiang1  YAO Ping1, 2  LIANG Daozan3

(1. Guangdong Polytechnic Normal University, Guangzhou 510630, China 

2. Guangzhou Institute of Technology, Guangzhou 510000, China

3. Guangdong Qizheng Technology Co., Ltd., Yangjiang 529932, China)

Abstract: Objective: To improve the quality of industrial robot aluminum alloy double pulse MIG welding, explore the influence of frequency matching duty cycle on welding quality, and obtain process parameters with good welding effect. Method: Double pulse MIG welding was used to weld 3 mm thick ER6061 aluminum alloy sheet, observe the surface formation of the weld, and study and analyze the geometric shape, welding electrical signal, and metallographic structure of the welded joint. Result: Under the conditions of current 70 A, welding speed 40 cm/min, peak to base ratio 50%, frequency 2 Hz, duty cycle 30%, the surface of the weld seam is well formed, without undercut or collapse, and the electrical signal is stable, which can achieve stable welding. Conclusion: When adjusting the duty cycle at a fixed frequency of 2 Hz, the values of melt width and melt depth change significantly with the increase of the duty cycle; Adjusting the frequency with a fixed duty cycle of 30% results in better welding results. Provide reference and reference for matching process parameters of aluminum alloy welding technology and improving welding quality.

Keywords: dual pulse MIG welding; frequency; duty cycle; welding joint geometry; weld forming; welding electrical signal; metallographic structure