Submerged arc welding control method and submerged arc welding apparatus

Abstract

In a submerged arc welding control method, the convergence of the arc length at arc start can be improved. [Solution] In a submerged arc welding control method that feeds a welding wire and outputs a welding current Iw and welding voltage Vw according to set external characteristics, a current setting value Is and a voltage setting value Vs are set, the external characteristics are set to pass through the intersection point A of the current setting value Is and the voltage setting value Vs, and the slope at the intersection point A is set to a negative value, and the feeding speed of the welding wire is variably controlled so that the welding voltage Vw is equal to the voltage setting value Vs, the operating point of the welding current Iw and welding voltage Vw is converged to the intersection point A of the external characteristics, and the slope is a first slope at the start of the arc, and thereafter it is switched to a second slope which has a larger absolute value than the first slope.

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