工业机器人铝合金双脉冲MIG焊工艺参数匹配对焊缝的影响

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

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。

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.