| 摘要 |
PURPOSE:To provide a titled device which does not break down thermally a material to be welded and can be constituted inexpensively by the constitution wherein a weld line is scanned by superposing the oscillation waveform of a frequency sufficiently higher than the basic signal of the deflection signal of an electron beam on said deflection signal. CONSTITUTION:The detection signal obtained by scanning an electron beam on a material to be welded by a periodic or intermittent signal and detecting the reflected ray generated from the surface of said material by the scanning electron beam and the current signal of an X-axis and a Y-axis inputted to a deflection coil for deflecting said scanning beam are inputted to a signal processing unit so as to be processed therewith, whereby the weld line of electron beam welding is detected. The current signal of the high frequency from a high frequency transmitter is inputted to the X-axis of one deflection signal of the electron beam and an ordinary sine wave signal is inputted to the other Y-axis in the above-mentioned method, and both signals are superposed to deflect the electron beam, whereby the locus of the scanning electron beam is made equivalently wide in line, the current density is decreased and heating power is decreased while the resolving power for the position in the Y-axis direction is kept unvaried. |
