Stainless Steel Cladding of Structural Steel Plate Using the Pulsed Current GMAW Process

摘要

Structural steel was clad with stainless steel using the pulsed current and conventional continuous current gas metal arc welding (GMAW) processes. Geometry, chemical composition, magnetic constituent (γ + δ) content and mi-crostructure of the stainless steel cladding produced by both the processes were studied. With both processes, an interactive layer was formed in the cladding adjacent to its interface with the structural steel. Hardness in the cladding and interactive layer was also studied. The characteristics of the cladding and the hardness of the interactive layer as a result of using pulsed current GMAW were correlated to the pulse parameters, such as mean current, pulse frequency and pulse duration. The characteristics of the pulsed current cladding were also compared to those of the continuous current cladding. It was observed that puIsed current GMAW stainless steel cladding of structural steel is beneficial compared to continuous current GMAW due to thicker deposition, lower dilution and depth of fusion, higher hardness of the cladding and lower hardness of the interactive layer. However, the characteristics of the cladding and interactive layer are found to be governed by the pulse parameters. The right selection of pulse parameters may produce comparatively finer microstructure in the weld cladding, which along with the lower dilution, may be beneficial to the corrosion properties of the cladding.