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使用CMT熔-钎焊技术以ER4043(A1Si5)焊丝作为填充金属对6061铝合金及表面预涂特种钎剂的304不锈钢异种材料进行了焊接。使用SEM、EDS、XRD及显微硬度试验对焊接接头的显微组织及力学性能进行了研究。结果表明:铝和不锈钢的CMT熔-钎焊缝成形良好,且熔化的焊丝向不锈钢侧铺展比较理想。焊接接头由热影响区、熔合区及钎焊界面层组成。热影响区及熔合区的组织为α-Al固溶体和Al-Si共晶相;在钎焊界面层形成一定厚度的化合物层,主要为FeAl_2相及Al_(0.5)Fe_3Si_(0.5)三元相。拉伸断裂于焊缝/钎焊界面层,断口为脆性断裂,接头强度为84.1MPa。
Solder the 6061 aluminum alloy and the 304 stainless steel dissimilar material with the special pre-coated flux on the ER4043 (A1Si5) wire using CMT fusion-brazing technology. The microstructure and mechanical properties of the welded joint were studied by SEM, EDS, XRD and microhardness test. The results show that the CMT fusion weld between aluminum and stainless steel is well formed and the molten wire spread to the stainless steel side is ideal. Welding joints by the heat affected zone, the fusion zone and brazing interface layer. The α-Al solid solution and Al-Si eutectic phase are formed in the heat-affected zone and the fusion zone. A certain thickness of the compound layer is formed on the brazing interface layer, mainly composed of FeAl_2 phase and Al_ (0.5) Fe_3Si_ (0.5) ternary phase. Tensile fracture in the weld / brazing interface layer, fracture brittle fracture, joint strength of 84.1MPa.