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以焊前不对铝合金板材做任何处理为前提,采用扩散冷却板条CO2激光系统,开展对1420铝锂合金的双光束激光焊接焊缝气孔控制的实验研究。实验结果表明:在激光表面扫描焊时,表面氧化膜对焊缝中气孔的影响大大高于背面氧化膜;但是,在激光对接焊时,焊缝气孔对背面氧化膜的敏感性和焊缝背面成形有直接的关系。经过实验得出了优化的焊接工艺以达到降低气孔率、提高焊缝质量的目的。还进行了1420铝锂合金的对接焊焊接接头拉伸强度实验。数据显示:选用优化的对接焊工艺,焊接接头的平均拉伸强度可达336.1MPa,为母材的87.5﹪。
Based on the precondition of not processing any aluminum alloy plate before welding, the CO2 laser system of diffusion cooling slab was used to carry out experimental research on the stomatal control of the double beam laser welding weld of 1420 Al-Li alloy. The experimental results show that the influence of the surface oxide film on the porosity of the weld is much higher than that of the back oxide film when the laser surface is scanned; however, the sensitivity of the weld porosity to the back oxide film and the back of the weld Forming has a direct relationship. Through experiments, the optimized welding process is obtained to reduce the porosity and improve the weld quality. Also carried out 1420 Al-Li alloy butt welded joint tensile strength test. The data shows that the optimal butt welding technology is adopted, the average tensile strength of the welded joints can reach 336.1MPa, 87.5% of the base metal.