Frishauf, Holtz, Goodman & Woodward
Arc welding method utilizing reciprocal movement of a torch in width direction of groove to be welded, and continuous movement of torch in longitudinal direction of groove to be welded
 An arc-welding method comprises reciprocally moving a welding electrode substantially vertically toward a groove formed between objects of welding, in the width direction of the groove, following the face of the groove; producing, by a welding torch, an arc between the tip of the electrode and the groove; moving the torch vertically up and down so that one of an arc voltage and arc current of the arc agrees with a previously set value; continuously detecting the vertical position of the torch as a value of voltage indicated by a potentiometer; and reversing the direction of the movement of the torch in the width direction of the groove at the moment when the detected value of voltage agrees with a previously set value of voltage. The method further comprises calculating, for one movement of the torch in the width direction of the groove, the value of the difference between the previously set value of voltage and the value of voltage detected by the potentiometer when the torch is at the lowest position thereof; and reversing the direction of movement of the torch in the width direction of the groove at the moment when the continuously detected value of voltage of the torch agrees with the calculated value of difference. 
Nippon Kokan Kabushiki Kaisha
B
B23K
inventional
Yuji Yasuo Hirokazu
Sugitani Suzuki Nomura