Automatic arc-welding method.

摘要

In an automatic arc-welding method, which comprises: continuously moving a carriage along the longitudinal direction of a groove formed between the objects of welding; reciprocally moving in the width direction of the groove a welding electrode directed substantially vertically to said groove through a welding torch fitted to said carriage, following the groove face of said groove; producting an arc between the tip of said electrode and said groove; moving said torch vertically and down so that the value (Ev) of one of arc voltage and arc current agrees with a previously set value (Eo); on the other hand, continuously detecting a vertical position of said torch as a value of voltage (eY) indicated by a potentiometer; reversing the direction of movement of said torch in the width direction of said groove at the moment when said value of voltage (eY) agrees with a previously set value of voltage (eH); thereby welding said objects of welding in the longitudinal direction of said groove; the improvement characterized by: calculating, for one movement of said torch in the width direction of said groove, a value of sum (eH + eV of said previously set value of vaoltage (eH) and a value of voltage (eV) corresponding to a deviation ( DELTA L) of the distance between said carriage and said objects of welding from a previously set distance (L); and reversing the direction of said torch in the width direction of said groove at the moment when said value of voltage (eY) agrees with said calculated value of sum (eH + eV).