Effect of Welding Process on Properties of Hastelloy C-276 Deposited Metal

The TIG and MIG welding tests and chloride ion corrosion tests were carried out for Hastelloy C276 in order to analyze the mechanical properties, surface morphology, corrosion rate and corrosion mechanism of the deposited metal. The results show that the TIG welding droplet has a 140° angle with the base material which is not wetted and small pores are easily formed during the welding process. The corrosion resistance and elongation of the deposited metal are low, and the corrosion rate increases to 0.11 g/cm2 * h. With the increase of welding power, the dendrite spacing and dendrite segregation of deposited metal can be significantly increased and the corrosion resistance can be reduced. Solution treatment can significantly improve the corrosion resistance of deposited metal with the corrosion rate decreases from 0.02 to 0.008 g/cm2 * h. Slow cooling results in the precipitation of μ phase which deteriorates the corrosion resistance and mechanical properties of the material.