Abstract

The research was aimed to determine the influence of the welding regimes and the filler metal types on the hard-faced weld bead and its Heat Affected Zone (HAZ). The welding process was performed on the plate samples (bead-on-plate test) of low-alloy steel 30CrMoV9. Five filler metals were used, four gas shielding welding wires of different chemical composition and one flux-cored wire. The welding regimes (electricity, voltage and welding speed) were varied, two regimes for each filler metal. After welding, the weld bead dimensions and hardness were measured and the bending test was carried out, as well. Based on the performed measurement and analysis, appropriate conclusions were drawn. Applied filler metal and arc energy can significantly affect the properties of weld beads and HAZ, but used base material 30CrMoV9 requires preheating and/or subsequent heat treatment.

Keywords:Welding; Hard facing; Filler material; Weld bead bending test