Hardfacing applications on alloy steels require more than welding capability — they demand careful procedure development and a strong understanding of material compatibility.
Our team recently completed the development and qualification of a Procedure Qualification Record (PQR) for a hardfacing application on ASTM A182 F22 Cr-Mo steel.
The procedure utilised a GMAW ERNiCr-3 buttering layer, followed by a GTAW Stellite 6 hardfacing overlay. The nickel alloy buttering layer provides a metallurgically compatible transition between the Cr-Mo substrate and the cobalt-based hardfacing alloy, helping minimise dilution while reducing the risk of cracking.
The final weld produced a controlled multi-pass overlay with consistent bead deposition, allowing the Stellite layer to maintain its required wear-resistant properties.
Procedure development and qualification like this highlight the importance of process control, metallurgical understanding, and disciplined welding practices when working with alloy steels.
