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利用一种新型的复合熔-钎焊工艺焊接铝合金和不锈钢。在MIG熔-钎焊工艺中,因钢的导热性差而导致焊缝钢侧的温度梯度变化剧烈,利用TIG电弧加热钢侧可改善这一现象。TIG辅助电弧改善了熔融金属在钢基体上的润湿性,使熔融金属能充分地在钢侧焊接坡口区正面及背面充分润湿,所得接头成形良好;增加了金属间化合物层内Cr、Ni的含量,提高了其力学性能;同时,改变了化合物层的形貌,增强了其与焊缝的结合强度。TIG辅助焊接工艺下获得接头的平均拉伸强度(146.7 MPa)明显高于无辅助TIG电弧下接头的拉伸强度(96.7 MPa)。
Aluminum alloy and stainless steel are welded by a new type of composite fusion brazing process. In the MIG fusion-brazing process, the temperature gradient on the steel side of the weld changes drastically due to the poor thermal conductivity of the steel, and this phenomenon can be ameliorated by heating the steel side with the TIG arc. TIG auxiliary arc improves the wettability of the molten metal on the steel substrate so that the molten metal can fully wet the front and the back of the weld zone on the steel side, and the obtained joint is well formed. The intermetallic compound layer Cr, Ni content increased its mechanical properties; the same time, changed the compound layer morphology, enhanced its bond strength with the weld. The average tensile strength (146.7 MPa) of the joints obtained under the TIG auxiliary welding process was significantly higher than that of the joints without the auxiliary TIG arc (96.7 MPa).