Metal Transfer and Spatter Loss in Double Gas Shielded Metal Arc Welding : Study on Double Gas Shielded Metal Arc Welding (Report 1)

概要

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Metal transfer, spatter formation and blowhole formation in gas shielded metal arc welding with two separately fed shielding gases and wire electrode (DD50S) of diameter 1.2 mm were investigated. The gas supply was done separately ; through the inner nozzle an inert shielding gas was independently fed, while carbon dioxide was fed to the outer nozzle to shield the welding site from the atmosphere. Metal transfers under separately fed shielding gases can be classified into short circuiting, globular, spray transfer modes. An observation of high speed photograph shows that the droplet formation and metal transfer mode are similar as in the case of argon shielded welding in which a broad arc core and a large arc attachement point that covers the whole wire electrode tip are produced. The spatter weight measured in this process is small compared to CO_2-arc and conventional MAG welding process, which may be due to a projected spray metal transfer. When the welding current and voltage increase the spatter that sticks to the nozzle becomes much less ; even with long arc time (5 minutes) at selected welding condition of 300A and 30V the measured spatter was 0.9 gram.
社団法人溶接学会の論文
1988-10-01