TWI Industrial Member Report Summary 320/1986
By D N Noble
Weld overlaying is frequently used for improving wear resistance of components, thereby prolonging their life. Applied correctly, hardsurfacing materials can lead to substantial cost savings by reducing maintenance and replacement costs and by avoiding excessive component breakdown and consequential production losses. However, there are few guidelines available for fabricators to follow when using hardfacing consumables to ensure maximum wear resistance whilst maintaining cost-effectiveness through adequate deposition rates. This report presents data on the influence of deposition conditions on wear properties. Two iron-based self-shielded flux-cored arc welding abrasion resistant consumables were studied, one being a low alloy steel of composition 0.5%C, 6.0%Cr, 1.2%Mo, O.3%Ti and 1.0%Mn, with the other a high chromium austenitic iron containing about 5.0%C, 1.0%Mn, 22.5%Cr and 5.5%Nb. Weld pads were fabricated from these consumables, varying current, voltage and electrode stickout, and samples were taken for laboratory wear testing, metallography and chemical analysis. Correlations between the wear test data, welding conditions and deposit microstructure are presented.