【摘要】：針對(duì)高速脈沖MIG焊易出現(xiàn)咬邊、駝峰焊道等焊接缺陷,首次采用附加補(bǔ)償保護(hù)氣體方法,在靠近脈沖MIG焊焊槍噴嘴保護(hù)氣罩的后端專門構(gòu)建保護(hù)氣體支路,通過(guò)該支路三通氣閥控制補(bǔ)償保護(hù)氣體流量,對(duì)剛脫離焊槍噴嘴的高溫固液態(tài)焊縫實(shí)施人工干預(yù)成形和焊縫表面二次氣體保護(hù).以18-8型奧氏體不銹鋼薄板為母材作平板堆焊試驗(yàn),結(jié)果表明,引入適量附加補(bǔ)償保護(hù)氣體后,既能明顯改善焊縫成形,又能對(duì)焊縫表面實(shí)施及時(shí)跟蹤保護(hù),對(duì)抑制單絲高速脈沖MIG焊時(shí)易出現(xiàn)的焊接缺陷改善效果明顯,焊接效率可實(shí)現(xiàn)較大提升,在理論和工藝實(shí)踐上具有進(jìn)一步研究?jī)r(jià)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.
【作者單位】： 華南理工大學(xué)機(jī)械與汽車工程學(xué)院;貴州民族大學(xué)理學(xué)院;
【基金】：廣東省省部產(chǎn)學(xué)研資助項(xiàng)目(2013B090600098)
【分類號(hào)】：TG444.72

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