等离子弧焊接SiCp/Al基复合材料焊缝“原位”合金化分析
“In-situ” weld-alloying of plasma arc welding of SiCp/Al MMC
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摘要: 采用等离子弧焊焊接SiCp/Al基复合材料,以Ar+N2为离子气,并以Ti作为合金化填充材料,研究了焊缝"原位"合金化元素Ti对焊缝显微组织的影响。结果表明,采用焊缝原位合金化方法焊接SiC颗粒增强铝基复合材料(SiCp/Al MMCs),可以有效抑制焊缝中针状脆性相Al4C3的形成,并且由于Ti的加入,改善了增强相和Al基体之间的润湿性,形成了稳定的熔池,得到以均匀分布的TiN、AlN等为增强相的新型铝基复合材料焊缝,焊接性能得到有效提高。同时还研究了Ti的添加量对焊缝显微组织的影响,结果发现,随着Ti含量的增加,焊缝中还生成如Ti5Si3等新的增强相。焊缝"原位"合金化等离子弧焊接是焊接SiCp/Al基复合材料的一种新方法。Abstract: Plasma arc welding was used to join SiCp/Al composite and titanium used as alloy filler. Microstructure of the weld is characterized as functions of alloy content. Results show that the acicular harmful phase Al4C3 is completely eliminated in the weld of SiCp/Al MMC by "in-situ" weld-alloying of plasma arc welding with titanium. The wetting property was improved between reinforced phase and Al matrix. A stable weld pool, a novel composite-material welded joint reinforced by TiN and AlN was produced and welding performance was improved effectively because of the use of titanium. "In-situ" weld-alloying of plasma arc welding is a new promising method for joining of SiCp/Al MMCs.
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