Metal Transfer and Spatter Loss in Double Gas Shielded Metal Arc Welding Using Flux-Cored Wire : Study on Double Gas Shielded Metal Arc Welding (Report 2)

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Metal transfer, spatter formation and blowhole formation in double gas shielded metal arc welding using flux-cored wires (DL50, SF-1) of diameter 1.2mm were investigated. The experimental procedure was explained in report 1. The increase of argon proportion in the inner nozzle plays a vital role in spatter formation mechanism and metal transfer mode. As the gas proportion increases, the spatter formation decreases and the arc becomes more stable and a spray-like transfer is obtained. At high welding current and voltage with argon gas flow rate of 7 l/min the spatter that sticks to the nozzle is much less compared to that of DMAG with solid wire, CO_2-arc and conventional MAG welding process, even with long arc time (4 minutes). Under selected welding condition of 300A and 30V the measured spatter was remarkably low, i.e. 0.076 gram. An observation of high speed cinefilm and still camera photographs shows that the metal transfer modes are globular accompanied with short-circuiting, spray-like and explosive transfer. The droplet detachment is either the molten metal moves down along the molten slag pole or falls freely.
社団法人溶接学会の論文
1989-04-01