Welding method, and welding device for use therein, and method of analysis for evaluating welds

摘要

Described is a method of automatically welding pipes, comprising welding with a pulsation welding current and monitoring, by means of a sensor, the variations occurring in the arc voltage caused by weld pool oscillations. The occurrence of voltage variations with only frequency components below 100 Hz indicates excessive welding through; the occurrence of voltage variations with only frequency components above 100 Hz indicates in sufficient welding through; a welding process showing proper welding through is characterized by the occurrence of voltage variations in two different frequency peaks.