| 摘要 |
PURPOSE:To eliminate the need for the operation for cutting a wire in the stage of ending welding and to enable automatic welding by stopping the feed of the filler wire at the point where the control of the down slope of an electron beam starts at the terminal part of welding. CONSTITUTION:Slope down control is performed by supplying the electron beam energy required for welding up to the time (a) when welding ends and thereafter decreasing gradually the current until the current is made zero at the point (b). A filler wire 5 is fed cooperatively with the irradiation of the electron beam up to the point (a) in this stage and the driving of the supply is stopped when the wire arrives at the point (a). The melting portion of the wire 5 shifts gradually to the surface of materials 1 to be welded in the remaining molten pool and only the surface is melted at the point (d). Since the members 1 move like an arrow B, the wire 5 is disconnected from the materials 1. |
