PURPOSE:To stabilize shape, the external appearance and the quality of a welded zone by feedback-controlling a welding current, the welding voltage and the welding speed. CONSTITUTION:The titled welding controller consists of a welding machine 1, a welding torch 1a, a wire feed drum 1b, an electric power unit 2, a gas bomb 3, members 9 to be welded, a microcomputer 10, etc. Signals detected by a welding current detector 4, a welding voltage detector 5, a wire feed quantity detector 6, a welding speed detector 7 and a base metal temperature detector 8 respectively are inputted to the microcomputer 10. The sampling is carried out with the prescribed times/sec with respect to the welding current and the welding voltage to calculate the data approxi mate to a waveform average value. The welding heat gain is calculted from said data and the welding speed and compared with a set value of a welding condition setting part of the microcomputer and if there is a value out of a tolerance as a result of decision, a control signal is given to the eletric power unit 2 or a welding torch driving source. By this method, the welding current, voltage, the welding speed and the welding heat gain are controlled and the control based on the quantitative data to meet a welding phenomenon is carried out and the deterioration and thermal strain of base metals are little and the welding of stable quality is performed.
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