Al-Mg-Si6082合金氩弧焊焊接接头的气孔与合金元素烧损

Blowhole and alloy element burning loss of Al-Mg-Si 6082 alloy joint welded by argon arc welding

关键词:  氩弧焊  铝合金  气孔  元素烧损

Key words:  argon arc welding  aluminum alloy  blowhole  element burning loss

摘要:

对3和10 mm厚的Al-Mg-Si6082合金分别进行了TIG焊和MIG焊,获得了成形良好、表面无缺陷的焊接接头.通过对焊缝进行金相试验,研究了TIG焊和MIG焊时焊缝中气孔的种类与差异,并分析了产生气孔差异的原因;通过对Mg,Si合金元素成分含量的测定,揭示出了Mg,Si合金元素氩弧焊时的烧损规律.结果表明,MIG焊时,焊缝中易出现皮下气孔、肩下气孔和心气孔;Mg,Si元素在焊缝中部的烧损最为严重,越靠近热影响区元素的烧损程度越轻;Mg元素的烧损率明显高于Si元素;MIG焊时,Mg,Si元素的烧损率与弧长成反比.

Abstract:

Al-Mg-Si 6082 alloys with thickness of 3 mm and 10 mm were respectively welded by TIG welding and MIG welding,and the good welded joints without the superficial flaws were obtained.Through the metallographic test to the joints,the type and difference of blowhole in the joints were studied,and the reason for the blowhole difference was analyzed.Through the measurement of ingredient contents of Mg and Si alloying elements,the burning loss rule of Mg and Si by argon arc welding was discovered.The results show that the skin pores,under-shoulder pores,and heart stomal pores are easy to emerge in the weld by MIG welding.The nearer to heat-affected zone the lower the element burning loss is.The most serious burning loss of Mg and Si elements is in the middle of the weld,and the burning loss of Mg is obviously higher than that of Si.The burning rate of Mg and Si elements is inversely proportional to the arc length by MIG welding.