Abstract:To achieve high efficiency and cost reduction, large heat input welding such as submerged arc welding (SAW) and metal inert gas arc welding (MIG) using large currents are employed. However, the large heat input given to the weld may produce coarse grains in the HAZ and a reduction of toughness. To avoid these problems, narrow gap welding (NGW) which is effective in reducing heat input and achieving high productivity is often employed. However, the pear-shaped bead cracking may form according to the welding con… Show more
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