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Arc start control method for AC arc welding

A technology of AC arc and control method, which is applied in the direction of arc welding equipment, welding equipment, manufacturing tools, etc., and can solve problems such as time-consuming, arc breaking, and easy arc breaking

Active Publication Date: 2006-07-19
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the influence of the inductance value and resistance value of the current path, there is a limit that can shorten the negative polarity period of the electrode, and it is difficult to achieve an electrode negative polarity ratio Rn of several percent from the viewpoint of realization.
In addition, in the electrode negative polarity ratio Rn of about 10% or less, the polarity is switched to EN→EP after the polarity switching from EP→EN, and the polarity switching again becomes an unstable state after the polarity switching. , prone to arc break
[0012] (2) The problem of arc interruption at the time of polarity switching due to low base metal temperature
The adjustment of these parameters is more complicated, and the adjustment takes time

Method used

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  • Arc start control method for AC arc welding
  • Arc start control method for AC arc welding
  • Arc start control method for AC arc welding

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Embodiment Construction

[0038] Hereinafter, various embodiments of the present invention will be described with reference to the drawings.

[0039] figure 1 It is a waveform diagram showing the arc ignition control method of AC arc welding according to the embodiment of the present invention. The figure (A) shows the time change of the welding start signal St, the figure (B) shows the time change of the welding current Iw, the figure (C) shows the time change of the electrode negative polarity ratio Rn, and the figure (D) shows the wire feeding speed of the welding wire Time variation of Wf. Hereinafter, description will be made with reference to this figure.

[0040] At time t1, when the welding start signal St is at a high level as shown in (A), the welding wire is fed to the base metal at a slow decelerated wire-feeding speed Fs as shown in (D). At time t2, when the leading end of the welding wire reaches and touches the base material, the welding wire is switched to the initial wire feeding s...

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Abstract

An arc start control method for AC arc welding is provided. In accordance with the method, upon arc start, a welding wire (1) is supplied at an initial feeding speed (Fi), and DC arc welding with electrode-positive polarity is performed during an initial period (Tdc) of hundreds of milliseconds by applying a DC welding current (Idc) with electrode-positive polarity (EP). Then, the welding is switched to AC arc welding based on an AC welding current, and the wire feeding speed (Wf) is varied from the initial feeding speed (Fi) to a steady-state feeding speed (Fc) with a slope (Sf). The initial feeding speed (Fi) is set so that the DC welding current (Idc) is substantially equal to the average (Iav) of the AC welding current. Also, the initial period (Tdc) is set so that the bead shape by the DC arc welding is substantially the same as the bead shape by the AC arc welding. Further, the slope (Sf) is determined so as to be substantially proportional to the rate of change in the wire welding speed observed when the DC welding current (Idc) is switched to the AC welding current.

Description

technical field [0001] The invention relates to an arc striking control method for improving the arc striking performance of melting pole alternating current arc welding. Background technique [0002] In molten electrode welding, a welding wire as a molten electrode is supplied to the base material at a predetermined speed, and a DC or AC welding voltage Vw is applied between the welding wire and the base material, and welding is performed by a welding current Iw. Therefore, melting pole arc welding (hereinafter only referred to as arc welding) can be divided into melting pole direct current arc welding (hereinafter only called direct current arc welding) and melting pole alternating current arc welding (hereinafter only called alternating current arc welding). Figure 5 It is an example of the waveform diagram of the welding current Iw of this DC arc welding. DC arc welding generally uses the electrode positive polarity EP with the welding wire as the anode and the base met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/00B23K9/095B23K9/067B23K9/09B23K9/12
CPCB23K9/10
Inventor 西坂太志仝红军
Owner DAIHEN CORP
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