目前铝合金熔化极气体保护焊接头传统分区过于简单,难于表征解释接头性能及组织演变.本文采用彩色金相腐蚀观察技术,结合焊接热循环特征,进一步把铝合金焊接接头分为焊缝、未混合区、部分熔化区、真实热影响区、母材等区域.对各区微观组织特征进行观察分析,阐述未混合区的形成机理,部分熔化区的晶界液化现象,多层多道焊缝组织的影响规律.结果表明控制热输入,制定合理焊接工艺,减少高温停留时间,控制焊缝稀释率,设计合理的焊接接头,合理控制焊接接头组织对于提高厚板铝合金焊接接头力学性能具有重要意义.
The traditional partitioning of MIG welded joint is very coarse.The understanding regions of welded joint has evolved tremendously.A fusion weld joint was thought to consist of three regions,the fusion zone and HAZ,which is not sufficient.Examination of a welded joint reveals several distinct microstructure regions in this paper.The fusion zone and HAZ is subdivided.The previous technological probes allow one to compare the effects of base metal,welding conditions,welding consumables,constrains and give answers in the "better-worse".
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