铝合金激光双光点焊接

对铝合金薄板激光单光点和双光点焊接(包括不填丝和填丝)的焊缝成形、对接间隙和准直度容许裕度以及气孔状况进行了比较，分析了双光点能量分布的激光对铝合金焊接的影响。结果表明，与激光单光点焊接相比，激光双光点焊接铝合金可以改善焊缝表面质量、增大焊缝熔宽并放宽对接间隙和准直度容许裕度、显著减少焊缝中大气孔的数量，但对焊缝中小气孔数量的影响不明显。填加焊丝可以改善激光单光点焊接铝合金焊缝的表面质量并放宽对接间隙和准直度容许裕度，但将增大焊缝产生大气孔的倾向。采用激光双光点焊接仍可使焊缝中大气孔的数量明显减少。

Twin-Spot Laser Welding of Aluminum Alloy

Single-spot laser and twin-spot laser welding, with or without wire feeding, of aluminum alloy were carried out. The weld shaping, the thresholds of gap width and spot separation, and the states of porosity in weld with various laser welding procedures were compared, and the influences of twin-spot laser on welding of aluminum alloy were analyzed. It showed that in contrast to single-spot laser welding of aluminum alloy, twin-spot laser welding can improve the weld surface quality, increase the weld width and the thresholds of gap width and spot separation, decrease obviously the large porosities in number, but do not the small porosities. Feeding wire in process of single-spot laser welding of aluminum alloy can improve the weld surface quality, increase the thresholds of gap width and spot separation, but increase large porosities in number. Twin spot laser welding with wire feeding can decrease the large porosities in number.