Study on Arc Spraying Technique for Repairing Automobile Parts Based on Four Factors Experimental Method

The wear-resisting property and hardness of arc-sprayed coatings is affected by spraying parameters, such as compressed air pressure, spraying current, spraying distance and wire feeding speed. In this paper, the four factors orthogonal experiment method was applied to optimize those four parameters. T12 high-carbon steel wire and SCDP-3 spray gun were used in the experiment. SKODA-Savin plunge wear test machine and the HB3000 Brinell hardness tester were used to measure the wear resistance and hardness of the coating. Based on the analyses of experimental data, the relationship curves of four factors versus the wear resistance and hardness were set up separately. The variance analysis of data shows that the gas pressure and spraying distance have the most significant effect on the wear resistance, wire feeding speed has the effect on the wear resistance, and the spraying current has less effect on the wear resistance. Four factors significantly affect the coating hardness, however the compressed air pressure has the greatest effect on the coating hardness. By the optimization analysis, the optimum parameters are obtained.