A variation of the gas metal arc welding process uses a tubular electrode wherein metallic powders make up the bulk of the core materials (metal-cored electrode). Such an electrode requires a gas shield to protect the molten weld pool from atmospheric contamination. Metal-cored electrodes are to be considered a segment of GMAW by the American Welding Society. Foreign welding associations may group metal-cored electrodes with flux-cored electrodes. Metal-cored wires were patented in 1957, mainly as a means of overcoming a shortage of solid welding wire at that time. Slag levels are low and it is possible to put three or more runs without deslagging. The lack of slag also makes welding easier. Mechanisation allows metal cored wires to be used at high productivity. Few research papers are available in the area of metal-cored arc welding to explain the importance of the wire and how these wires are different from solid and flux-cored wires. A detailed description of the effects of welding variables (in the context of solid wires) on the weld bead penetration, the bead geometry and the reinforcement has been discussed in the AWS handbook. This study has been carried out in order to analyse the behaviour of metal-cored wires with changes in welding variables. During this investigation, the effects of various welding parameters including the welding speed, the welding current and the voltage on the depth of penetration, the weld bead width and the reinforcement were studied using an automatic metal-cored arc welding process. Welding currents were chosen as 315 A, 330 A and 345 A, arc voltages as 29 V, 31 V and 33 V and welding speeds as 180 mm/min, 190 mm/min and 200 mm/min for all experiments. During the investigation, 1.6 mm metal-cored wire (Coredweld 70) was selected for the bead-on-plate study on 15 mm thick mild steel plate under a shielding gas mixture of argon (80%) + CO2 (20%).
Effect of metal-cored arc welding process parameters on weld bead geometry
Welding and Cutting ; 12 , 2 ; 106-111
2013
6 Seiten, 11 Bilder, 1 Tabelle, 5 Quellen
Aufsatz (Zeitschrift)
Englisch
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