Welding device

Patent metadata

Field	Value
Publication number	US-10850340-B2
Application number	US-201816106363-A
Country	US
Kind code	B2
Filing date	Aug 21, 2018
Priority date	Nov 25, 2009
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

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 device for performing welding by feeding a welding wire and alternately repeating short circuits and arcs, the device comprising:
a feeding motor for feeding the welding wire;
a current detector for detecting a welding current;
a voltage detector for detecting a welding voltage;
an AS determination unit for detecting a short-circuit state and an arc state based on an output of the voltage detector;
an output controller for controlling a welding output based on an output of the current detector, the output of the voltage detector, and an output of the AS determination unit;
a welding output unit for generating a welding output based on an output of the output controller;
a current setting unit for setting a first current value as a threshold for the welding current; and
a wire feed controller for controlling the feeding of the welding wire based on an output of the current setting unit, the output of the AS determination unit, and the output of the current detector, wherein
the feeding of the welding wire is stopped, slowed down, or moved backward after the welding current reaches the first current value during a short circuit, the first current value being larger than the welding current at a start of the short circuit.

2. The device of claim 1 , wherein
the first current value is equal to a predetermined overcurrent protection detection current value, the predetermined overcurrent protection detection current value being a reference current value used to determine whether a welding output should be stopped in order to protect the device from overcurrent.

3. A device for performing welding by feeding a welding wire and alternately repeating short circuits and arcs, the device comprising:
a feeding motor for feeding the welding wire;
a current detector for detecting a welding current;
a voltage detector for detecting a welding voltage;
an AS determination unit for detecting a short-circuit state and an arc state based on an output of the voltage detector;
an output controller for controlling a welding output based on an output of the current detector, the output of the voltage detector, and an output of the AS determination unit;
a welding output unit for generating a welding output based on an output of the output controller;
a current setting unit for setting a first current value as a threshold for the welding current;
a time keeper for counting a time since the welding current reached the first current value;
an elapsed-time setting unit for setting a first predetermined time, the first predetermined time being an elapsed-time threshold since the welding current reached the first current value; and
a wire feed controller for controlling the feeding of the welding wire based on an output of the current setting unit, an output of the time keeper, an output of the elapsed-time setting unit, the output of the AS determination unit, and the output of the current detector, wherein
the feeding of the welding wire is stopped, slowed down, or moved backward after the first predetermined time has passed since the welding current reached the first current value during a short circuit, the first current value being larger than the welding current at a start of the short circuit.

4. The device of claim 3 , wherein
the feeding of the welding wire is stopped, slowed down, or moved backward after a first predetermined time has passed since the welding current reached the first current value; and
the first predetermined time is shorter than a predetermined overcurrent protection detection time, the predetermined overcurrent protection detection time being a reference time used to determine whether a welding output should be stopped in order to protect the device from overcurrent.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

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

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