铝合金铸件,特别是一些结构复杂的铸件,在浇铸后或机械加工时常发现裂纹、夹渣、掉砂、缩孔、疏松等各种缺陷。为了能按时完成生产任务,减少经济损失,常常采用补焊的方法。因为铸造铝合金的补焊容易出现裂 Aluminum alloy castings, especially those with complicated structures, often find defects such as cracks, slag inclusions, sand-out, shrinkage cavities and looseness after casting or machining. In order to be able to complete the production tasks on time, reduce economic losses, often using repair welding methods. Because the casting of aluminum welding repair prone to cracking