| 摘要 |
PURPOSE:To prevent a shrinkage hole and welding defect and to increase a welding speed with an optimal flux by forming the specified connection among the distance between the first pool electrodes, the current value and drag angu lar of the succeeding pool first electrode with the plural electrode multipool submerged arc welding of more than a fixed welding speed. CONSTITUTION:In the plural electrode multipool submerged arc welding of >=1.5m/min welding speed, the pool length and crater angle are optimized with the distance among the electrodes of >=two pieces of the first pool being made <=40mm. The defect of slag contamination is eliminated as well with 10-50 deg. drag angular of the first electrode of the succeeding pool Further with 5-10kW final pool input and yet with <=800A welding current I1 in case of the number (n) of the composing electrodes being a piece, <=1200A in case of two pieces and <=1300A in case of three pieces, and in case of I1>=<550>A <with> <=<0.9(n>-<1)>XI1A the nth electrode current In, the welding is performed with In<=550A in case of I1<=550A. The shrinkage hole is completely prevented and the use of the optimal flux is enabled without welding defects and the productivity is increased by the increase in welding speed.
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