Arc sprayed coatings are used mainly in the repairment and anti-wear coating of structures. As a result of arc spraying process, however, residual stresses can occur in the deposited part and base metal. Besides, the deposited part possesses a lot of pores and show the insufficient bonding strength. These residual stresses, pores and bonding conditions have a great influence on the mechanical properties of the deposited part.
In this study, the heat flow problem in multi-pass arc spraying process was modelled and solved by a numerical method and a series of experiments was carried out to measure the temperature change. Secondly the laser beam was irradiated on arc sprayed coatings for quality improvement and the heat flow in this process was also predicted by the same numerical method.
The calculated and experimental results were in relative good agreement for various process parameters. Moreover, as a result of laser treatment of arc sprayed coatings, the pores in coatings could be fully removed, and accordingly the bonding strength was increased through the metallurgical joint between the coating and base metal.