Investigation of longitudinal cracks in a hardened layer by MF-10-60-GP welding wire on ST44-2

In the industry, MF-10-60-GRZ welding wire is used according to DIN8555 standard for surface hardening of the guides with the welding method. Cracks called stress release cracks or check cracks can be observed in the welds that have been created by this welding wire. The existence of a longitudinal crack more than the standard leads to reconstructions or rejection of the part. The purpose of this article is to review the various solutions used to remove longitudinal cracks created during surface hardening. In this research, the methods of Submerged Arc Welding (SAW) and Flux Cored Arc Welding (FCAW) were used. The results of surface hardening with different methods showed that there is no practical way to reach a hardened layer of 15 mm, and the only reliable way is to create the low-carbon steel layers (welded metal deposited using ER70s-6) between the hard layers (high-alloy cast iron).