Development of ultra-low spatter CO2 gas-shielded arc welding process J-STAR&reg welding

J-STAR&reg Welding is performed with an electrode negative polarity using a rare earth metal added wire in CO2 gas shielded arc. In the welding current over 250 A, a conical arc plasma was formed from the wire tip, and the droplets that transfer to molten pool became fine and continuous, what is called spray transfer, during J-STAR Welding. In the welding current under 200 A, application of waveform control of welding current realized periodic short circuit transfer. As a result, spatter generation was reduced to less than 10% in comparison with that of conventional CO2 gas shielded arc welding method.