PURPOSE:To stabilize the weld quality by resetting a timer to the initial set time and forming a molten pool extending for the set time at the time of performing the arc cutting while the molten pool is formed. CONSTITUTION:A timer system circuit 5 or a different system from a welding controller 2 is provided and an arc cutting signal output circuit 13, the timer 14 and a power source 15 are connected in series respectively with a general purpose outside output terminal 2a of the controller 2. Furthermore, a switch 16 is connected with a general purpose outside input terminal 2b of the controller 2. When the arc cutting is performed while the molten pool is formed according to a storage program of the controller 2, the controller 2 is stopped abnormally and an arc cutting signal is supplied from the signal output circuit 13 to the timer 14 and the timer 14 is cleared and reset to the set time. Since the proper molten pool is formed at all times at the time of the arc cutting, the weld quantity is stabilized by this method.
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