Welding method and welding device

Patent metadata

Field	Value
Publication number	US-10058947-B2
Application number	US-201013318648-A
Country	US
Kind code	B2
Filing date	Nov 10, 2010
Priority date	Nov 25, 2009
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

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.

First claim

The invention claimed is:

1. A method for performing welding, the method comprising:
welding in one arc state by feeding a welding wire at a basic feed speed; and
welding in one short circuit state following the welding in the one arc state by feeding the welding wire at the basic feed speed and at a first feed speed, such that a feed speed of the welding wire during the welding in the one short circuit state is changed from the basic feed speed to the first feed speed, the change being initiated after a welding current reaches a predetermined current during the one short circuit,
wherein the predetermined current is larger than the welding current at a start of the one short circuit state, and
the first feed speed is slower than the basic feed speed.

2. The method of claim 1 , wherein
the feed speed of the welding wire is changed after a predetermined time has passed since the welding current reached the predetermined current.

3. The method of claim 1 , wherein
the predetermined current is a predetermined overcurrent protection detection current which is used to determine whether a welding output should be stopped in order to protect a welding device from overcurrent.

4. The method of claim 2 , wherein
the predetermined time is shorter than a predetermined overcurrent protection detection time which is used to determine whether a welding output should be stopped in order to protect a welding device from overcurrent.

5. The method of claim 1 , further comprising:
welding in another arc state following the welding in the one short circuit state by feeding the welding wire at the basic feed speed.

6. A method for performing welding, the method comprising:
welding in one arc state by feeding a welding wire at a basic feed speed; and
welding in one short circuit state following the welding in the one arc state by feeding the welding wire at the basic feed speed and stopping the welding wire, such that a feed speed of the welding wire during the welding in the one short circuit state is stopped, the stop being initiated after a welding current reaches a predetermined current during the one short circuit state, and
the predetermined current is larger than the welding current at a start of the one short circuit state.

7. The method of claim 6 , wherein
the feeding of the welding wire is stopped after a predetermined time has passed since the welding current reached the predetermined current.

8. The method of claim 6 , wherein
the predetermined current is a predetermined overcurrent protection detection current which is used to determine whether a welding output should be stopped in order to protect a welding device from overcurrent.

9. The method of claim 7 , wherein
the predetermined time is shorter than a predetermined overcurrent protection detection time which is used to determine whether a welding output should be stopped in order to protect a welding device from overcurrent.

10. The method of claim 6 , further comprising:
welding in another arc state following the welding in the one short circuit state by feeding the welding wire at the basic feed speed.

11. A method for performing welding, the method comprising:
welding in one arc state by feeding a welding wire at a basic feed speed; and
welding in one short circuit state following the welding in the one arc state by feeding the welding wire at the basic feed speed and at a backward feed speed, such that a feed speed of the welding wire during the welding in the one short circuit state is reversed, the reversal being initiated after a welding current reaches a predetermined current during the one short circuit state, and
the predetermined current is larger than the welding current at a start of the one short circuit state.

12. The method of claim 11 , wherein
the feeding of the welding wire is reversed after a predetermined time has passed since the welding current reached the predetermined current.

13. The method of claim 11 , wherein
the predetermined current is a predetermined overcurrent protection detection current which is used to determine whether a welding output should be stopped in order to protect a welding device from overcurrent.

14. The method of claim 12 , wherein
the predetermined time is shorter than a predetermined overcurrent protection detection time which is used to determine whether a welding output should be stopped in order to protect a welding device from overcurrent.

15. The method of claim 11 , further comprising:
welding in another arc state following the welding in the one short circuit state by feeding the welding wire at the basic feed speed.

16. The method of claim 1 , further comprising:
stopping welding when a predetermined overcurrent protection detection time has passed after the welding current reaches a predetermined overcurrent protection detection current which is used to determine whether a welding output should be stopped in order to protect a welding device from overcurrent, wherein
the predetermined overcurrent protection detection time is used to determine whether a welding output should be stopped in order to protect the welding device from overcurrent.

17. The method of claim 6 , further comprising:
stopping welding when a predetermined overcurrent protection detection time has passed after the welding current reaches a predetermined overcurrent protection detection current which is used to determine whether a welding output should be stopped in order to protect a welding device from overcurrent, wherein
the predetermined overcurrent protection detection time is used to determine whether a welding output should be stopped in order to protect the welding device from overcurrent.

18. The method of claim 11 , further comprising:
stopping welding when a predetermined overcurrent protection detection time has passed after the welding current reaches a predetermined overcurrent protection detection current which is used to determine whether a welding output should be stopped in order to protect a welding device from overcurrent, wherein
the predetermined overcurrent protection detection time is used to determine whether a welding output should be stopped in order to protect the welding device from overcurrent.

19. The method of claim 1 , further comprising:
welding in another short circuit state before the welding in the one arc state by feeding the welding wire at the basic feed speed.

20. The method of claim 6 , further comprising:
welding in another short circuit state before the welding in the one arc state by feeding the welding wire at the basic feed speed.

21. The method of claim 11 , further comprising:
welding in another short circuit state before the welding in the one arc state by feeding the welding wire at the basic feed speed.

Assignees

• Tanaka Yoshiaki
• Matsumoto Kazunori
• Sato Kimiya
• Nakagawa Akira
• Yuzawa Hiroki
• Ihara Hideki
• Panasonic Ip Man Co Ltd

Inventors

• Tanaka Yoshiaki
• Matsumoto Kazunori
• Sato Kimiya
• Nakagawa Akira
• Yuzawa Hiroki
• Ihara Hideki

Classifications

• B23K9/073 Primary

  Stabilising the arc · 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