| 摘要 |
PURPOSE:To prevent a welding crack by repeatedly projecting at high seed the beam widely oscillating in the energy density having the preheating or postheating action only and the beam narrowly oscillating capable of a penetration or the beam stopping the oscillation capable of penetration. CONSTITUTION:An abutted welding member 1 is welded in the direction of an arrow mark 2 and an electron beam 3 is oscillated at high speed in the X direction of an arrow mark 5 and Y direction of an arrow mark 6 by an electromagnetic deflecting coil 4 and projected on an electron beam pattern 7. The waveform 8 widely oscillating in the energy density having a preheating or postheating action and the waveform 9 narrowly oscillating in the energy density having the action capable of penetration are alternately repeated at high speed to execute welding with oscillating the beam in X and Y directions. In a 2nd method, the oscillation may be stopped temporarily in the section of the waveform 9 due to the action capable of penetration. The weld zone of high quality having no welding crack nor spatters is thus obtd.
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