# US 11,305,370 B2 · Arc welding control method

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- Number: US 11,305,370 B2
- Document ID: US11305370B2
- Status: Granted
- Kind: B2
- Application number: 16/338,870
- Filed: 2017-09-28
- Published: 2020-05-07
- Granted: 2022-04-19
- Earliest claimed: 2016-10-31
- Assignees: DAIHEN Corporation
- Applicants: Daihen Corporation
- Inventors: Kohei Ono; Toshiaki Nakamata
- Web page: https://patentgrep.com/patent/US11305370B2

## CPC

- B23K 9/23: taking account of the properties of the materials to be welded
- B23K 9/073: Stabilising the arc
- B23K 9/093: {the frequency of the pulses produced being modulable}
- B23K 9/125: {Feeding of electrodes (for stabilising arc B23K9/073)}
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM

## Abstract

In an arc welding control method for controlling welding in which a material of a base material is a galvanized steel sheet, a feed speed of a welding wire is alternately switched between a forward feed period and a reverse feed period, and a short circuit period and an arc period are repeated, during the arc period, a first arc period Ta1 during which a first arc current Ia1 is applied, a second arc period Ta2 during which a second arc current Ia2 is applied, and a third arc period Ta3 during which a third arc current Ia3 is applied are switched over time, and it is controlled so as to be Ia1>Ia2>Ia3. Constant voltage control is performed during the second arc period Ta2, and constant current control is performed during the first arc period Ta1.

## Claims

### Claim 1

An arc welding control method that comprises controlling welding in which a material of a base material is a galvanized steel sheet, a feed speed of a welding wire is alternately switched between a forward feed period and a reverse feed period, and a short circuit period and an arc period are repeated,
wherein during the arc period, a first arc period during which a first arc current Ia1 is applied, a second arc period during which a second arc current Ia2 is applied, and a third arc period during which a third arc current Ia3 is applied are switched over time, to control so as to be Ia1>Ia2>Ia3, wherein constant current control is performed during the first arc period, and wherein constant current control is performed during the third arc period, and
wherein at least one of a value of a time length of the first arc period and a value of the first arc current Ia1 is determined according to a zinc deposition amount per unit area of the base material.

### Claim 2 (depends on 1)

The arc welding control method according to claim 1, wherein constant voltage control is performed during the second arc period.

### Claim 3 (depends on 2)

The arc welding control method according to claim 2, wherein at least one of the value of the time length of the first arc period and the value of the first arc current Ia1 is set to a value such that zinc vapor does not remain in a molten pool after being discharged from the molten pool.

### Claim 4 (depends on 2)

The arc welding control method according to claim 2, wherein a waveform parameter of the feed speed is set so that an average value of repetition frequencies of the forward feed period and the reverse feed period is in a range of 70 Hz to 90 Hz.

### Claim 5 (depends on 4)

The arc welding control method according to claim 4, wherein the waveform parameter is at least a forward feed peak value and a reverse feed peak value.

### Claim 6 (depends on 5)

The arc welding control method according to claim 5, wherein the waveform parameter is set so that the average value of the repetition frequencies lowers as the zinc deposition amount per unit area of the base material increases.

### Claim 7 (depends on 4)

The arc welding control method according to claim 4, wherein the waveform parameter is set so that the average value of the repetition frequencies lowers as the zinc deposition amount per unit area of the base material increases.

### Claim 8 (depends on 1)

The arc welding control method according to claim 1, wherein at least one of the value of the time length of the first arc period and the value of the first arc current Ia1 is set to a value such that zinc vapor does not remain in a molten pool after being discharged from the molten pool.

### Claim 9 (depends on 1)

The arc welding control method according to claim 1, wherein a waveform parameter of the feed speed is set so that an average value of repetition frequencies of the forward feed period and the reverse feed period is in a range of 70 Hz to 90 Hz.

### Claim 10 (depends on 9)

The arc welding control method according to claim 9, wherein the waveform parameter is at least a forward feed peak value and a reverse feed peak value.

### Claim 11 (depends on 10)

The arc welding control method according to claim 10, wherein the waveform parameter is set so that the average value of the repetition frequencies lowers as the zinc deposition amount per unit area of the base material increases.

### Claim 12 (depends on 9)

The arc welding control method according to claim 9, wherein the waveform parameter is set so that the average value of the repetition frequencies lowers as the zinc deposition amount per unit area of the base material increases.