| 摘要 |
PURPOSE:To detect exactly the position of the weld metal at the end part on base metals and to automate electroslag welding by positioning a probe in a slag bath, detecting the potential difference between the probe and the base metal and comparing the same with a reference voltage. CONSTITUTION:A probe 9 is provided above base metals 1, 2, apart at a spacing lfrom the upper part of the metals 1, 2. The probe 9 and the metal 1 are connected by means of lead wires 10, 11 to a voltmeter 12. A slag bath 8 ascends on progression of welding and contacts with the tip of the probe 9, then the probe 9 is dipped in the bath 8 and the potential difference between the probe 9 and the metal 1 is measured by the voltmeter 12. If the potential difference between the probe 9 and the metal conforming the distance between the probe 9 and a molten metal 7 is beforehand investigated empirically and is set as a reference voltage, the output is obtd. always at the specified distance between the probe 9 and the metal 1 irrespectively of the depth in the bath 8 and the position of the molten metal 7 is detected. |
