PURPOSE: To escape a generated gas to an atm. and to prevent a welding defect by executing welding so as to cover the opening of the plate end part where a notch is slit and so that a welding bead does not cover the whole notch part space for the formed notch depth.
CONSTITUTION: A notch 2 is slit at the weld zone of the end part of a magnetic steel sheet 1. The width (a) of the notch part 2 is preferably in 0.3W1.5mm and the depth (b) in 1.5W3mm. welding is executed so as to cover the sheet part side opening of this notch part 2 and also so that a welding bead 3 does not cover the whole space of the notch part 2 for a farmed notch depth (b). and the gas generated from the remaining notch part is escaped into an atm. By this method the generation of a welding defect is prevented and also the welding work is made efficient.
ICHI TOMOYUKI
IIDA YOSHIAKI
