搅拌摩擦焊接头形成过程分析
Forming process study of friction stir welding joint
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摘要: 基于搅拌摩擦焊三维模型的切面分析方法,建立了焊接过程中接头切面的演变行为,将搅拌摩擦焊接头形成过程分为挤出阶段、迁移阶段、回填阶段和轴肩作用阶段四个阶段,对搅拌针作用下材料迁移过程进行了分析,指出挤出阶段将原始对接面及其表面氧化物迁移到后退侧,迁移阶段实现洋葱环层状组织的形成,并实现氧化物的碎化、弥散,回填阶段完成洋葱环形貌的最终成形.结果表明,采用切面分析法建立的接头形成过程四阶段能够较好地解释搅拌摩擦焊接头形成机制以及"S线"等缺陷的产生原因.Abstract: Based on the section analysis of three-dimensional model of friction stir welding, the evolution of the joint section of the welding process was established.The forming process of friction stir welding was divided into extrusion stage, migration stage, backfilling stage and shoulder effect stage.The first three stages which were affected by stir pin were analyzed.The analysis of the material migration processes of the first three stages pointed out that the original surface and the residual oxides were migrated to the retreat side in the extrusion stage, the onion ring structure was formed, the oxides were fragmentated and dispersed in the migration stage and the onion ring structure was fully formed in the backfilling stage.The studies showed that if the above three stages could not effectively complete the forming processes, the superposition effect of a variety of defects forming mechanisms would lead to the formation of the final defects.The results show that the four stages of the forming process established by using the section analysis can be used to explain the forming mechanisms of FSW joints and the causes of the "S line" and other defects.
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Keywords:
- friction stir welding /
- section analysis /
- joint forming /
- defect
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期刊类型引用(16)
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