附加补偿保护气体对高速脉冲MIG焊焊缝的影响

发布时间：2019-03-12 18:24

【摘要】：针对高速脉冲MIG焊易出现咬边、驼峰焊道等焊接缺陷,首次采用附加补偿保护气体方法,在靠近脉冲MIG焊焊枪喷嘴保护气罩的后端专门构建保护气体支路,通过该支路三通气阀控制补偿保护气体流量,对刚脱离焊枪喷嘴的高温固液态焊缝实施人工干预成形和焊缝表面二次气体保护.以18-8型奥氏体不锈钢薄板为母材作平板堆焊试验,结果表明,引入适量附加补偿保护气体后,既能明显改善焊缝成形,又能对焊缝表面实施及时跟踪保护,对抑制单丝高速脉冲MIG焊时易出现的焊接缺陷改善效果明显,焊接效率可实现较大提升,在理论和工艺实践上具有进一步研究价值.
[Abstract]:In view of the welding defects of high speed pulse MIG welding, such as edge biting, hump weld bead and so on, the additional compensating gas method is used for the first time, and the protective gas branch is specially constructed at the back end of the nozzle shielded gas shield near the pulsed MIG welding torch. The gas flow rate of compensation protection is controlled by this branch three-way gas valve, and the high-temperature solid-liquid weld is formed by manual intervention and the secondary gas protection on the weld surface is carried out for the high-temperature solid-liquid weld just separated from the welding torch nozzle. The plate surfacing test of 18-8 austenitic stainless steel sheet was carried out. The results show that the welding seam formation can be obviously improved and the weld surface can be tracked and protected in time by adding appropriate amount of compensation protective gas. The improvement of welding defects easily occurred in high-speed pulsed MIG welding with monofilament is obvious, and the welding efficiency can be greatly improved, which has further research value in theory and technology practice.
【作者单位】：华南理工大学机械与汽车工程学院;贵州民族大学理学院;
【基金】：广东省省部产学研资助项目(2013B090600098)
【分类号】：TG444.72

【相似文献】