Welding device
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsYoshiaki Tanaka, Kazunori Matsumoto, Kimiya Sato, Akira Nakagawa, Hiroki Yuzawa, Hideki Ihara
Life of this patent
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Abstract
In a method and device for performing welding, after the welding current reaches a first current value during a short circuit, the feeding of the welding wire is stopped, slowed down, or moved backward. As a result, the opening of a short circuit is urged to reduce the frequency at which welding is unnecessarily interrupted by an overcurrent protection function. This achieves high weld quality such as the absence of welding defects, and high production efficiency.
Claims4
A device for performing welding by feeding a welding wire and alternately repeating short circuits and arcs, the device comprising:
- a feeding motor for feeding the welding wire;
- a current detector for detecting a welding current;
- a voltage detector for detecting a welding voltage;
- an AS determination unit for detecting a short-circuit state and an arc state based on an output of the voltage detector;
- an output controller for controlling a welding output based on an output of the current detector, the output of the voltage detector, and an output of the AS determination unit;
- a welding output unit for generating a welding output based on an output of the output controller;
- a current setting unit for setting a first current value as a threshold for the welding current;
- and
- a wire feed controller for controlling the feeding of the welding wire based on an output of the current setting unit, the output of the AS determination unit, and the output of the current detector, wherein
- the feeding of the welding wire is stopped, slowed down, or moved backward after the welding current reaches the first current value during a short circuit, the first current value being larger than the welding current at a start of the short circuit.
A device for performing welding by feeding a welding wire and alternately repeating short circuits and arcs, the device comprising:
- a feeding motor for feeding the welding wire;
- a current detector for detecting a welding current;
- a voltage detector for detecting a welding voltage;
- an AS determination unit for detecting a short-circuit state and an arc state based on an output of the voltage detector;
- an output controller for controlling a welding output based on an output of the current detector, the output of the voltage detector, and an output of the AS determination unit;
- a welding output unit for generating a welding output based on an output of the output controller;
- a current setting unit for setting a first current value as a threshold for the welding current;
- a time keeper for counting a time since the welding current reached the first current value;
- an elapsed-time setting unit for setting a first predetermined time, the first predetermined time being an elapsed-time threshold since the welding current reached the first current value;
- and
- a wire feed controller for controlling the feeding of the welding wire based on an output of the current setting unit, an output of the time keeper, an output of the elapsed-time setting unit, the output of the AS determination unit, and the output of the current detector, wherein
- the feeding of the welding wire is stopped, slowed down, or moved backward after the first predetermined time has passed since the welding current reached the first current value during a short circuit, the first current value being larger than the welding current at a start of the short circuit.
Dependencies are inferred from the claim text.