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Impulsive arc welding method

A welding method and pulse arc technology, applied in the field of pulse arc welding power sources, can solve problems such as inability to manage arc length and the like

Inactive Publication Date: 2009-10-07
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the arc length cannot be managed by the displayed value of the voltmeter

Method used

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Embodiment Construction

[0030] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0031] FIG. 1 is a block diagram of a pulse arc welding power source according to an embodiment of the present invention. Hereinafter, each block will be described with reference to the drawings.

[0032] The power supply main circuit PM takes a commercial AC power supply (3-phase 200V, etc.) as input, performs output control such as inverter control and chopper control based on the following current error amplification signal Ei, and outputs welding voltage Vw suitable for welding and Welding current Iw. The welding wire 1 is fed inside the welding torch 4 by the rotation of a wire feed roller (roll) 5 of the wire feeding device, and an arc 3 is generated between the welding wire 1 and the base material 2 .

[0033] The voltage detection circuit VD detects the aforementioned welding voltage, and outputs a welding voltage detection signal Vd. The reference voltage wa...

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Abstract

Use only inert gas in the shielding gas, pass the pulse waveform welding current (Iw) consisting of peak current and base current, and detect the welding voltage (Vw) between the melting electrode (1) and the base metal (2) , limit the welding voltage detection value (Vd) within the specified fluctuation range (Vc±ΔVc) from the reference voltage waveform (Vc) of the pulse waveform, calculate the welding voltage limit value (Vft), and control the output of the welding power source so that In a pulsed arc welding power source in which the welding voltage limit average value (Vfa) after averaging the welding voltage limit value (Vft) is approximately equal to the preset voltage setting value (Vs), even if an abnormal voltage is superimposed, the arc The length-proportional voltage value is displayed on the welding power source's voltmeter.

Description

technical field [0001] The present invention relates to a pulse arc welding power source for displaying a voltage value roughly proportional to the arc length in a voltmeter in pulse arc welding using only argon as a shielding gas. Background technique [0002] In arc welding, especially in molten electrode arc welding, an appropriate arc length, which is the distance between the tip of the electrode and the base metal, is used to stabilize the welding state and improve the welding quality such as bead formation. important condition. The arc length is generally approximately proportional to the average value Vav of the voltage (welding voltage Vw) between the electrode and the base metal. Therefore, in the fusion electrode arc welding power supply, the output control is performed so that the welding voltage average value Vav is substantially equal to the preset voltage setting value Vs, and the arc length is controlled to an appropriate value. Furthermore, in order to main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/09
Inventor 上园敏郎
Owner DAIHEN CORP