Analysis And Study On Induction Remelting Of Sprayed Aluminium Of Q 235 Steel Surface

Based on electromagnetics the theoretical analysis on induction remelting of sprayed aluminium on iron surface is carried out, analytical expression of temperature distribution is given and with which temperature trendline of certain problem at the moment of induction heating is drawn out. According to the basic theory of numerical simulation, the transient temperature field of induction remelting of sprayed aluminium on Q235 steel substrate is simulated. The induction magnetic field and the transient temperature distributing between the substrate surface and the coating at the moment of induction heating is obtained. The influence of the technical parameters on the induction heating simulation result is analyed, and appropriate technical parameters are found. Experiments are carried out according to the numerical simulation results, and the technical parameters obtained from the simulation are used in the experiments. The control factors of the induction heating are studied, the optimum technical condition for induction remelting are found, and quantitative observation and analysis on the sample is carried out with SEM and XRD. Wear-resisting test on the sample is corducted before and after the induction remelting with a friction and attrition testing machine self-made. The results show that at the moment of the induction heating there is a high temperature area at the substrate surface and the coating surface, respectively. Compared to the distributing of temperature field obtained from the theory analysis, the result obtained by numerical simulation is much closer to the experimental result. The adhesive strength between the sprayed aluminum and the iron substrate is increased because of the induction remelting treatments. The remelting effect is the best as the current is 300A and the treating time is 25 second. A metallurgical layer is formed between the coating and the substrate after the induction remelting treatment, which can increase the adhesive strength between the sprayed aluminum and the iron substrate. The metallurgical adhesion is developed between the coating and the substrate after the treatments, and wear-resisting is improved obviously.