Abstract
The application of Taquchi method in the optimization of PTA hardfacing process for the wear-resistant plate has been studied in this paper. The operation current, powder feeding rate, torch moving rate and torch moving distance are the four factors evaluated in this research. Taguchi methodology is applied to make the association of these factors in optimization and through the observation of microstructure, hardness, wear-resistance and dilution rate to evaluate the effects of these factors on the hardfacing layer of the wear-resistant plate. By the microstructure observation, the more sturdy and compact of the Cr-C dendrite structure, the better the hardness and wear-resistance of the hardfacing layer is. The torch moving distance is the major factor of the surface hardness, and the torch moving rate for the wear, the working current for the dilution rate.
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