The Effect of Parameter of MIG Arc Brazing on Microstructure and Bonding Strength of Tin-based Babbitt Alloy ZChSnSb11-6 on ASTM 1045 Steel

Abstract

The effect of parameter of MIG arc brazing on the microstructure and the bonding strength of ZChSnSb11-6 and steel substrate has been studied. A cladding of ZChSnSb11-6 was obtained on the surface of medium carbon steel by MIG arc brazing. The microstructure of ZChSnSb11-6 and the microstructure of the interface between ZChSnSb11-6 and steel substrate have been systematically investigated. The highest bonding strength of ZChSnSb11-6 and the steel substrate is 66.42Mpa when welding voltage is 22V and welding current is 120A. The reason for the enhancement of the bonding strength was discussed. When the hard and brittle SnSb phase near the IMC layer is subjected to tensile stress at the interface between the Tin-based Babbitt alloy and the steel substrate, stress concentration occurs and the initiation and propagation of cracks are promoted. When the welding voltage is 20V, The number of the SnSb phase near the IMC layer decreases while the welding current increases, so the bonding strength increases. When the welding current is 120A, the distribution of SnSb phase changes while the welding voltage increases. When the welding voltage is 22V, the bonding strength is the highest.