Analysis of porosity characteristics of 5052 aluminum alloy welded by hybrid CO2 laser-MIG welding
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摘要: CO2激光-金属惰性气体保护焊(MIG)复合焊接作为一种高效快速的焊接方法,其焊接铝合金较易产生气孔。为了分析中厚度铝合金CO2激光-MIG复合焊接气孔特性,采用在10mm厚的5052铝合金上进行堆焊试验的方法进行了理论分析和实验验证,可知热源间距和背部保护气垫块对铝合金CO2激光-MIG复合焊接气孔有较大的影响,热源间距在2mm～3mm时气孔率最小。结果表明,采用背部保护气垫块可以有效抑制气孔。Abstract: Hybrid CO2 laser-metal inertia gas(MIG) welding is an efficient and fast welding method,however,porosity is prone to produce when welding aluminum alloy.In order to analyze the porosity characteristics of aluminum alloy in medium thickness by means of hybrid CO2 laser-MIG welding,10mm thick 5052 aluminum alloy was welded by means of bead weld.Theoretical analysis and experimental verification was carried out.The results show that the heat source space and the back protection cushion block influence the porosity obviously.The porosity rate is minimum when the heat source spacing is 2mm~3mm.Porosity can be effectively suppressed by the back protection of cushion block.
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Keywords:
- laser technique /
- porosity /
- CO2 laser /
- heat source spacing /
- hybrid welding /
- aluminum alloys in medium thickness
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