Research on 16Mo3 (16M) Steel Pipes Overlaid with Haynes Nicro625 Alloy Using MIG (131) Method / Badania Rur Ze Stali 16Mo3 (16M) Napawanych Metodą MIG (131) Stopem Haynes Nicro625

Abstract

The paper presents the research on the microstructure and mechanical properties of a pipe made of 16Mo3 steel, overlaid with superalloy based on Haynes NiCro625 nickel. The overlay weld was overlaid using the MIG (131) method. The performed macro - and microscopic tests have shown the correct structure of the overlay weld without any welding unconformities. The examined overlay weld was characterized by a dendritic structure of the primary crystals accumulating towards the heat removal. It has been proved that the content of iron in the surface zone does not exceed 7%, and the steel-superalloy joint shows the highest properties in comparison with the materials joined.