CN-122007550-A - Arc starting control method, welding power source, welding system, and recording medium storing program

CN122007550ACN 122007550 ACN122007550 ACN 122007550ACN-122007550-A

Abstract

In gas shielded arc welding, stable arc starting can be performed regardless of the welding method. The arc starting control method in gas metal arc welding using a welding wire or a filler wire includes at least a retraction control period, a start reference period, a feed control method for switching a feed speed alternately between a forward feed period and a reverse feed period and repeating the forward feed period and the reverse feed period as 1 cycle after the retraction control, a transition to a reference value related to a predetermined tip position of the welding wire or filler wire, and a start initial condition period, wherein the feed control method is maintained for a predetermined period under a predetermined welding condition after the start reference period.

Inventors

Xu Peier
Nakaji Sego
SEKIGUCHI SHOTA

Assignees

株式会社神户制钢所

Dates

Publication Date: 20260512
Application Date: 20251110
Priority Date: 20241111

Claims (11)

1. An arc starting control method in gas metal arc welding using a welding wire or a filler wire, The arcing control method is characterized in that, At least, from the start of welding to the transition to the stable welding period, comprises: During the retraction control, the retraction control is performed; After the retraction control, a feed control method is changed to a feed control method in which the feed speed is alternately switched to a forward feed period and a reverse feed period and the forward feed period and the reverse feed period are repeated as 1 cycle, and the feed control method is changed to a predetermined reference value related to the tip position of the welding wire or the filler wire, and During the initial condition, after the reference period, the feeding control method is maintained for a predetermined period under a predetermined welding condition.
2. The arcing control method of claim 1, wherein, In the start reference period, the reference value for the tip position of the welding wire or the filler wire is a predetermined value in at least one of the wire position phase and the feed speed phase.
3. The arcing control method of claim 1, wherein, At least one welding condition other than the feed speed is changed during the start reference period.
4. The arcing control method of claim 1, wherein, In the start initial condition period, the welding current is set to be a pulse waveform for repeating a peak period and a base period, and the start timing of the peak period and the base period is determined according to the tip position of the welding wire or the filler wire.
5. The arcing control method of claim 4, wherein, At least one of the elapsed time and the number of pulses of the welding current is set as a threshold value during the start initial condition period, and the welding current is switched from the start initial condition period to the steady welding period.
6. The arcing control method of claim 5, wherein, The threshold value is changed according to the set welding conditions or welding information.
7. The arcing control method of claim 1, wherein, During the initial starting condition, the set value of the arc voltage is set such that the ratio of the average feeding speed to the set value of the arc voltage is 2.0-6.0.
8. The arcing control method of claim 1, wherein, The retraction control period comprises at least a retraction CC interval, The set value of the welding current in the retraction CC section is changed according to the elapsed time from the end of the previous welding to the start of the next welding.
9. A welding power supply for performing arc starting control in gas metal arc welding using a welding wire or a filler wire, The welding power supply is characterized in that, At least, from the start of welding to the transition to the stable welding period, comprises: During the retraction control, the retraction control is performed; After the retraction control, a feed control method is changed to a feed control method in which the feed speed is alternately switched to a forward feed period and a reverse feed period and the forward feed period and the reverse feed period are repeated as 1 cycle, and the feed control method is changed to a predetermined reference value related to the tip position of the welding wire or the filler wire, and During the initial condition, after the reference period, the feeding control method is maintained for a predetermined period under a predetermined welding condition.
10. A welding system for performing arc starting control in gas metal arc welding using a welding wire or a filler wire, The welding system is characterized in that, At least, from the start of welding to the transition to the stable welding period, comprises: During the retraction control, the retraction control is performed; After the retraction control, a feed control method is changed to a feed control method in which the feed speed is alternately switched to a forward feed period and a reverse feed period and the forward feed period and the reverse feed period are repeated as 1 cycle, and the feed control method is changed to a predetermined reference value related to the tip position of the welding wire or the filler wire, and During the initial condition, after the reference period, the feeding control method is maintained for a predetermined period under a predetermined welding condition.
11. A recording medium storing a program for performing arc starting control in gas metal arc welding using a welding wire or a filler wire, The recording medium is characterized in that, At least, from the start of welding to the transition to the stable welding period, comprises: During the retraction control, the retraction control is performed; After the retraction control, a feed control method is changed to a feed control method in which the feed speed is alternately switched to a forward feed period and a reverse feed period and the forward feed period and the reverse feed period are repeated as 1 cycle, and the feed control method is changed to a predetermined reference value related to the tip position of the welding wire or the filler wire, and During the initial condition, after the reference period, the feeding control method is maintained for a predetermined period under a predetermined welding condition.

Description

Arc starting control method, welding power source, welding system, and recording medium storing program Technical Field The present invention relates to an arc starting control method, a welding power source, a welding system, and a program for performing stable arc starting regardless of the welding method. Background The gas shielded arc welding is performed by various welding methods such as a short circuit welding method, a pulse welding method, and a feed control welding method, depending on the application, but in any of these methods, there is a transition welding period from the start of welding to the time when stable welding is achieved (hereinafter also referred to as a "stable welding period" or a "main welding period"), such as short circuit when an arc is generated, arc instability due to lack of formation of a molten pool, and instability of droplet transition due to fluctuation of welding conditions until a set value is reached. Therefore, conventionally, by controlling this transition welding period (hereinafter also referred to as "arc starting period"), a short circuit at the time of arc generation is stabilized, arc instability and instability of droplet transition are improved, spatter is reduced, and a good bead shape is ensured. Patent document 1 discloses control of an arc starting period in the case of a short-circuit welding method. After the start of welding is instructed, the welding wire feeding speed is set to the backward feeding during the short-circuit period from the time of short-circuit generation to the time of arc generation, the welding wire feeding speed is set to the forward feeding during the arc period from the time of arc generation to the time of the next short-circuit generation, and then the welding is performed by switching the welding wire feeding speed to the constant speed, thereby reducing the amount of spatter generated from the time of arc generation to the time of arc stabilization. Patent document 2 discloses control of an arc starting period in the case of a pulse welding method. When a predetermined time (t 1) elapses from the short-circuit welding control during the arc starting, the pulse welding is shifted to pulse welding, and the rising slope and/or the falling slope of the pulse waveform of the pulse welding output is gentle compared with the pulse waveform of the steady welding (hereinafter also referred to as "main welding"), and after the molten pool is sufficiently formed, the control is performed so that the pulse waveform of the steady welding is output, and the amount of spatter generated from the generation of the arc to the stabilization of the arc can be reduced. Patent document 3 discloses control of the arc starting period of a feed control welding method that alternately switches between a forward feed period and a reverse feed period to produce welding during a short circuit period and an arc period. In the transition welding period from the start of welding to the convergence to the steady welding period, the absolute value of the reverse feed peak and the absolute value of the forward feed peak of the feed speed are increased with the lapse of time, so that the welding state when switching from the transition welding period to the steady welding period can be stabilized. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2013-169555 Patent document 2 International publication No. 2012/032503 Patent document 3 Japanese patent application laid-open No. 2021-74732 Patent document 4 International publication No. 2015/163101 Patent document 5 Japanese patent application laid-open No. 2020-49506 Disclosure of Invention Problems to be solved by the invention As described above, in any of the short-circuit welding method, the pulse welding method, the feed control welding method, and the like, control during the arc starting is performed, but the feed control welding method is the highest in difficulty of control during the arc starting. In the feed control welding method, there are control conditions from the feed control such as the wire frequency and the wire amplitude, and various conditions need to be controlled until a stable welding period is reached, so that control becomes very difficult compared with other methods. As a result, droplet transition and arc instability are likely to occur, and the occurrence of spatter and the shape of the weld bead may be adversely affected. There are various types of feed control welding methods, including a type (hereinafter, also referred to as a "short-circuit feed control method") in which welding is performed based on a manner in which a feed rate of a wire is alternately switched between a forward feed period and a reverse feed period to cause a short-circuit transition between a short-circuit period and an arc period as represented by patent document 4, and a type (hereinafter, also referred to as a "short-circuit suppression feed control m