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摘要
During the remanufacture and repair of ZL101A alloy by TIG technology, owing to the material microstructure different from the substrate, the repaired part often produces color difference, which affects the mechanical properties, aesthetics degree as well as the willing to accept of potential consumers of the repaired object. In this research, 16 kinds of TIG repaired samples with different mechanical properties and repairing color difference were obtained by the orthogonal experiment of different welding current, preheating time and welding speed on the premise of the same material composition of wires and the substrate. After detection, it is found that the type, size and density of dark phases in the repaired part determine the repairing color difference, and the tensile properties of these samples with the small color difference are also higher. Through the regression fitting between the repairing color difference and the tensile strength, it shows that the coincidence degree of the cubic curve is the highest, and the coefficient of determination(CD) reaches 0.955. Ultimately, the rationality of the cubic curve fitting is verified by a set of univariate TIG repairing experiments. ? 2023 Editorial Office of Chinese Journal of Mechanical Engineering.
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