Arc welding control method

Patent metadata

Field	Value
Publication number	US-11267064-B2
Application number	US-201716326698-A
Country	US
Kind code	B2
Filing date	Aug 31, 2017
Priority date	Sep 5, 2016
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

A method of controlling arc welding with a consumable electrode includes repeating the following periods in sequence: a short-circuit welding period to perform short-circuit arc welding; a pulse welding period to perform pulse welding; and a cooling period in which the welding current output is zero.

First claim

The invention claimed is:

1. A method of controlling arc welding with a consumable electrode, the method comprising:
repeating following periods in sequence:
a short-circuit welding period to perform short-circuit arc welding;
a pulse welding period to perform pulse welding; and
a cooling period in which a welding current output is zero,

wherein the pulse welding period starts periodically at a constant interval by adjusting a length of the short-circuit welding period in accordance with a length of time from when feeding of a welding wire as the consumable electrode starts until when a short circuit is detected in the short-circuit welding period.

2. The method according to claim 1 , wherein a welding voltage output in the cooling period is zero.

3. The method according to claim 1 , wherein
in the short-circuit welding period, a welding wire as the consumable electrode is fed in alternating forward and backward directions at a predetermined cycle; and
in the pulse welding period, the welding wire is fed at a constant feed speed.

4. The method according to claim 3 , wherein while the welding wire is fed in alternating forward and backward directions at the predetermined cycle in the short-circuit welding period, an average feed speed of the welding wire is gradually increased to the constant feed speed set in the pulse welding period.

5. The method according to claim 3 , wherein while the welding wire is fed in alternating forward and backward directions at the predetermined cycle in the short-circuit welding period, an average feed speed of the welding wire is increased to the constant feed speed set in the pulse welding period and maintained at the constant feed speed.

6. The method according to claim 1 , wherein the length of the short-circuit start welding period is adjusted by controlling a slope of an average feed speed of the welding wire.

7. The method according to claim 1 , wherein the length of the short-circuit start welding period is adjusted by changing an inflection point at which an increasing average feed speed of the welding wire is switched to a constant feed speed.

8. The method according to claim 1 , wherein
the short-circuit welding period is started when a preceding torch switch signal is turned on and is continued until a predetermined period of time passes, and
while a welding wire is fed in alternating forward and backward directions at a predetermined cycle in the short-circuit welding period, an average feed speed of the welding wire is increased to a constant feed speed set in the pulse welding period so that the pulse welding starts periodically at a constant interval.

9. A method of controlling arc welding with a consumable electrode, the method comprising:
repeating following periods in sequence:
a short-circuit welding period to perform short-circuit arc welding;
a pulse welding period to perform pulse welding; and
a cooling period in which a welding current output is zero,

wherein
the method further comprises a second short-circuit welding period between the pulse welding period and the cooling period,
in the second short-circuit welding period, a welding wire is short-circuited to an object to be welded, and
a length of the second short-circuit welding period is adjusted in accordance with a length of time from when feeding of the welding wire as the consumable electrode starts until when a short circuit is detected in the short-circuit welding period so that the pulse welding period starts periodically at a constant interval.

10. The method according to claim 9 , wherein in the second short-circuit welding period, the welding wire is fed in alternating forward and backward directions at a predetermined cycle while an average feed speed of the welding wire is gradually decreased.

11. The method according to claim 1 , wherein the cooling period is in a range of 10 ms to 250 ms, both inclusive.

12. The method according to claim 1 , wherein
a cooling period at a beginning of welding is shorter than a cooling period during a welding section in continuous welding.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Furuyama Yuya
• Yonemori Shigeki
• Kawamoto Atsuhiro
• Fujiwara Junji
• Matsuoka Noriyuki

Classifications

• B23K9/073 Primary

  Stabilising the arc · CPC title

• B23K9/092

  characterised by the shape of the pulses produced · CPC title

• B23K9/0956

  using sensing means, e.g. optical · CPC title

• B23K9/09

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

• B23K9/124

  Circuits or methods for feeding welding wire · CPC title