Consumable electrode arc welding method and consumable electrode arc welding device

A consumable electrode arc welding device in which welding takes place by repeating an arc state and a short circuit state between a welding wire and a workpiece to be welded, the device comprising:

• a switching element for controlling a welding output;
• a welding voltage detector for detecting a welding voltage;
• a welding condition setting unit for setting a set current;
• a short circuit/arc detector for detecting one of the short circuit state and the arc state based on an output of the welding voltage detector;
• a memory for storing the set current, an average feed speed of wire feed speed, a frequency of the wire feed speed, and an amplitude of the wire feed speed in a linked manner;
• a wire feed speed determinator for determining the average feed speed of wire feed speed, the frequency of wire feed speed, and the amplitude of wire feed speed from the memory based on the set current set by the welding condition setting unit;
• and
• a wire feed speed controller for receiving an output of the short circuit/arc detector and an output of the wire feed speed determinator, and controlling the wire feed speed in cyclic change of forward feed and backward feed,
• wherein
• the wire feed speed controller stops the cyclic change and starts a constant control of the wire feed speed at a first feed speed if no short circuit occurs during deceleration of the wire feed speed in the forward feed of the welding wire before one of the wire feed speed reaching a predetermined feed speed, a predetermined time passing from arc generation, and a feed cycle of the welding wire reaching a predetermined angle when one feed cycle of the welding wire is expressed by an angle;
• and if the short circuit occurs during the forward feed at the first feed speed, deceleration from the first feed speed starts and the cyclic change is resumed for welding.

A consumable electrode arc welding device in which welding takes place by repeating an arc state and a short circuit state between a welding wire and a workpiece to be welded, the device comprising:

• a switching element for controlling a welding output;
• a welding voltage detector for detecting a welding voltage;
• a welding condition setting unit for setting a set current;
• a short circuit/arc detector for detecting one of the short circuit state and the arc state based on an output of the welding voltage detector;
• a memory for storing the set current, an average feed speed of wire feed speed, frequency of the wire feed speed, and an amplitude of the wire feed speed in a linked manner;
• a wire feed speed determinator for determining the average feed speed of wire feed speed, the frequency of wire feed speed, and the amplitude of wire feed speed from the memory based on the set current set by the welding condition setting unit;
• and
• a wire feed speed controller for receiving an output of the short circuit/arc detector and an output of the wire feed speed determinator, and controlling the wire feed speed in cyclic change of forward feed and backward feed,
• wherein
• the wire feed speed controller stops the cyclic change and starts a constant control of the wire feed speed at a second feed speed if a short circuit is not opened during acceleration of the wire feed speed in the backward feed of the welding wire before one of the wire feed speed reaching a predetermined feed speed, a predetermined time passing from short circuit generation, and a feed cycle of the welding wire reaching a predetermined angle when one feed cycle of the welding wire is expressed by angle;
• and if the short circuit is opened during the backward feed at the second feed speed, acceleration from the second feed speed starts and the cyclic change is resumed for welding.