采用双侧双激光束同步填丝焊工艺焊接新型铝合金薄板T形结构,对其接头进行微观组织和成分分布的分析.研究结果表明,热影响区晶粒粗大且晶界明显.微观组织中明显出现双激光束双侧同步焊接所特有的两个熔合线,且两个熔合线附近的组织形态不尽相同.析出相在焊缝中分布均匀,但在熔合线附近成片状排列分布.成分分析表明,由于填充焊丝的Si含量较高,使Si元素在焊缝中略有增加,但是激光束对焊缝底部Si元素烧损比较严重.%The microstructure and composition distribution of the new aluminum alloy T-connection structure welded by double laser bilateral synchronous welding technology is analyzed. The results of the study show that the coarse grains and grain boundaries emerge in the heat-affected zone obviously. There are two fusion lines emerging clearly which only appear in the process of the double laser bilateral synchronous welding. The forms of organization near the two fusion lines are not the same. The precipitated phases in the welding line distribute uniformly, but distribute into arrangement near the fusion lines. The element composition analysis results show that the Si element increases slightly in the weld line because of the relatively high content of the Si element in the weld wires, but the Si element vapor loses obviously on the bottoms of the weld lines due to the laser beams.
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