| 摘要 |
PURPOSE:To uniformize the quantity of shrinkage in the axial direction by maintaining a target transmitted beam current to the difference between the target transmitted beam current and a stored transmitted beam current after cylindrical bodies make a round around the circumference and return to the original position. CONSTITUTION:A command of an incident beam IIN corresponding to the target transmitted beam current I'OUT(S) is given from a controller 18 to a electron beam welding machine 6 and the incident beam current IIN is applied from the electron beam welding machine 6 to a joint part and the welding is performed. Since a transmitted beam current IOUT is not generated for a while at the time of starting the welding, even if the cylindrical bodies 1 and 2 make a round and return to the position K=1 in the peripheral direction, for a while, a signal of I'OUT(S)=IOUT(S) is given to the controller 18 and the transmitted beam current IOUT is controlled to a fixed value. The welding is performed while being controlled so as to attain the target transmitted beam current I'OUT(S) after subtracting the transmitted beam current at the time of starting the welding from the target transmitted beam current in case the welding is performed properly from the position where the transmitted beam current starts to rise.
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