Arc welding control method

Patent metadata

Field	Value
Publication number	US-10065258-B2
Application number	US-201515122278-A
Country	US
Kind code	B2
Filing date	Mar 10, 2015
Priority date	Mar 10, 2014
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

There is provided an arc welding control method of alternating feeding of a welding wire between forward feeding and reverse feeding periodically to generate a short-circuiting period and an arc period in a manner that shifting to the arc period is performed by reducing a welding current in the reverse feeding during the short-circuiting period. Reduction of the welding current is started from a time where a state of the reverse feeding reaches a predetermined reference state.

First claim

The invention claimed is:

1. An arc welding control method of alternating feeding of a welding wire between forward feeding and reverse feeding periodically to generate a short-circuiting period and an arc period in a manner that shifting to the arc period is performed by reducing a welding current in the reverse feeding during the short-circuiting period, the arc welding control method comprising:
outputting, by a feeding-rate setting circuit, a feeding rate setting signal having a predetermined pattern of alternating the forward feeding and the reverse feeding periodically;
outputting, by a feeding control circuit, a feeding control signal for feeding the welding wire at a feeding rate corresponding to the feeding rate setting signal;
outputting, by a reference-state setting circuit, a predetermined reference-state setting signal that specifies a reference state;
performing periodic alternating feeding, by a feeding motor and based on the feeding rate setting signal, the welding wire in a state of forward feeding and a state of reverse feeding to generate the short circuiting period and the arc period;
determining, by a reverse-feeding state discrimination circuit, during the state of reverse feeding, that the state of the reverse feeding reached the reference state; and
starting, by the reverse-feeding state discrimination circuit, reduction of the welding current from a time where the state of the reverse feeding reaches the reference state.

2. The arc welding control method according to claim 1 , wherein the reference state is a reference time period, and the state of reverse feeding includes a time period from start of the reverse feeding until the reference time period.

3. The arc welding control method according to claim 1 , wherein the state of reverse feeding is a feeding rate in a reverse feeding direction, and the reference state is a reference feeding rate.

4. The arc welding control method according to claim 1 , wherein the reference state is a reference phase, and the state of reverse feeding includes a phase of the reverse feeding to the reference phase.

5. The arc welding control method according to claim 1 , wherein the reference state is a reference feeding amount, and the state of reverse feeding includes a feeding amount of the welding wire during the reverse feeding until the feeding amount reaches the reference feeding amount.

6. The arc welding control method according to claim 1 , further comprising:
measuring a time period from a time when the reduction of welding current starts at a time when the shift to the arc period is performed; and
changing the reference state according to the measured time period.

Assignees

• Daihen Corp

Inventors

• Ide Akihiro

Classifications

• B23K9/124

  Circuits or methods for feeding welding wire · CPC title

• B23K9/09

  Arrangements or circuits for arc welding with pulsed current or voltage · CPC title

• B23K9/073 Primary

  Stabilising the arc · CPC title

• B23K9/0738 Primary

  Stabilising of the arc by automatic re-ignition means · CPC title

• B23K9/0953

  using computing means · CPC title