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MAG-TIG (metal active gas-Tungsten inert gas) double-arc welding process is applied to make stable back beads in the first layer during one-side multilayer welding without backing plate. To explain the reason why stable back beads can be formed, a comparison was made between single MAG welding and MAG-TIG double-arc welding. Results indicated that during the optimized condition in MAG-TIG double-arc...
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