Pulse arc welding output control method and arc length variation pulse arc welding output control method

摘要

An output control method is provided for a pulse arc welding in which a welding current (io) flows for one pulse period (Tpb(n)) including a peak period (Tp) with a flow of a peak current (Ip) and a base period (Tb) with a flow of a base current (Ib). External characteristics of a welding power source are preliminarily set by a slope Ks, a welding current reference value Is and a welding voltage reference value Vs. The absolute value va of the welding voltage and the absolute value ia of the welding current are detected. The integration Svb = ∫ (Ks × ia - Ks × Is + Vs - va) dt is calculated from a starting point of an n-th pulse period (Tpb(n)). The n-th pulse period is ended when the integration Svb reaches a predetermined value during a variable base period (Tb). Then the (n+1)-th pulse period (Tpb(n+1)) is started.