Arc welding method and arc welding device
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsJunji Fujiwara, Yuya Furuyama
Life of this patent
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Abstract
An arc welding method alternately generates a short-circuit state and an arc state. In the method, short circuits are generated also in the arc period. This more than doubles the total number of short circuits, which is the sum of the short circuits generated in the short circuit period and those generated in the arc period. This enables a thin plate to be arc welded at a higher speed, while reducing its burn-through.
Claims14
An arc welding method in which short-circuiting and arcing are generated alternately, the method comprising:
- upon detection of a release of a short circuit in a short circuit period, applying, in an arc period which is a composite arc period comprising a first arc period and a second arc period, following currents:
- a first current having a peak value higher than a value of a current observed when the short circuit is released, and
- a second current lower than the first current, and having a peak value lower than the value of the current observed when the short circuit is released;
- generating a short circuit between the first arc period and the second arc period in the composite arc period, the first arc period and the second arc period being included in a period comprising a falling period in which the first current is reduced to the second current and a second current period in which the second current is applied;
- and
- feeding a welding wire in alternating forward and backward directions.
An arc welding method in which short-circuiting and arcing are generated alternately, the method comprising:
- upon detection of a predictor of a release of a short circuit in a short circuit period, reducing a welding current observed when the predictor is detected to a lower current;
- upon detection of the release of the short circuit in the short circuit period, applying, in an arc period which is a composite arc period comprising a first arc period and a second arc period, following currents:
- a first current having a peak value higher than a value of the welding current observed when the predictor is detected, and
- a second current lower than the first current, and lower than the welding current observed when the predictor is detected, the second current having a peak value higher than the welding current which is reduced to the lower current when the predictor is detected;
- generating a short circuit between the first arc period and the second arc period in the composite arc period, the first arc period and the second arc period being included in a period comprising a falling period in which the first current is reduced to the second current and a second current period in which the second current is applied;
- and
- feeding a welding wire in alternating forward and backward directions.
Dependencies are inferred from the claim text.