Understanding the performance of welded joint at high temperature corrosive environment has become an objective of scientific investigation recently. This work encompasses the investigations carried out on the Gas tungsten arc welded AISI 4140 and AISI 304 in air-oxidation, molten salt environment of Na2SO4- 60%V2O5 and 2SO4-60% NaCl at 650 °C under cyclic condition are discussed. The resulting oxide scales in the weldment have been characterized systematically using surface analytical techniques. From the results of the experiments, it is observed that the scale thickness on low alloy steel side was found to be higher as compared to stainless steel side. Furthermore, weld interface has been found to be more susceptible to degradation than base metals due to inter diffusion of element across the interface and the formation of intermetallic compound.
The influences of air oxidation and molten salt environments on the hot corrosion behavior of the weldment have been discussed in this paper.
M. Arivarasu, Manikandan, M., Gokulkumar, K., Rajkumar, V., K Ramkumar, D., and Arivazhagan, N., “High temperature studies on welded joint in molten salt power plant environments”, International Journal of ChemTech Research, vol. 6, pp. 409–415, 2014.