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一、前言由于铝及其合金具有较高的比强度(对?而言),良好的低温韧性及抗蚀性等优点.因此其用途可扩大到飞机、车辆、船舶、低温?(?及化学设备等方面然而,对其焊接时,?产生众所周知的焊接缺陷,特别是气孔缺陷,在现场焊接过程中,大部分的修整是由于气孔所致.为了提高焊缝的可靠性和减少气孔的修整次数.近几年来随着铝合金结构材料需要量的增加,越来越迫切要求确定根本防止产生气孔的方法
I. INTRODUCTION Since aluminum and its alloys have the advantages of high specific strength (for?), Good low temperature toughness and corrosion resistance, their use can be extended to aircraft, vehicles, ships, cryogenic applications Equipment, etc. However, when it is soldered, it produces well-known welding defects, especially for the porosity defects, which are mostly caused by the pores in the field welding process.In order to improve the reliability of the welding seam and reduce the stomatal dressing The number of.In recent years with the aluminum alloy structural material requirements increase, more and more urgent need to determine the fundamental method to prevent the generation of pores