铝合金厚板CMT补焊工艺试验

Repair welding experiment by CMT welding technology for thick aluminum alloy plate

厚板铝合金产品在焊接生产制造中易出现局部气孔和焊接热裂纹等微小缺陷.对于重要产品需要进行修补,并且需要严格控制修补质量,降低焊接修复次数.针对铝合金厚板焊接结构修复质量提升的需求,利用低热输入、高质量的CMT焊接技术,进行7系高强铝合金CMT补焊工艺试验,与脉冲MIG焊接工艺的焊接接头组织进行了对比.结果表明,相对脉冲MIG焊接工艺,使用CMT工艺进行补焊的焊接温度场低,多次补焊焊接接头软化明显减弱,焊接接头组织恶化程度减弱.结果表明,铝合金厚板采用CMT焊接工艺进行补焊接头质量更为优良.

For the demand of low heat input,high quality welding technology,the repair welding experiment using CMT welding technology have been examined in thick aluminum alloy plate welding. The multiple repair welding was performed for hot cracking test in thick aluminum alloy plate. The results have shown that the hot crack susceptibility of CMT welding is lower than the pulsed MIG welding process. The test showed that CMT welding temperature field was lower,and the microstructure of welding joint was improved significantly compared to the joint welded bypulse MIG welding.