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Output control method for welding power supply

A technology of welding power supply and output control, applied in welding equipment, manufacturing tools, arc welding equipment, etc., to achieve the effect of improving welding quality and stability

Active Publication Date: 2009-08-05
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the external characteristics that can be formed by this prior art are in the case of a straight line falling to the right with a slope of -Rr0

Method used

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  • Output control method for welding power supply
  • Output control method for welding power supply
  • Output control method for welding power supply

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0080] The basic calculation formula used for the output control method of the welding power source concerning this invention is demonstrated below. Between the output voltage setting value Er, the inductance setting value Lr, the external characteristic slope setting value Rr, the welding current i, the welding voltage v, and the welding current control setting value Irc, the above formula (2) is established.

[0081] Irc=∫((Er—v—Rr·i) / Lr)·dt

[0082] Here, (Er−Rr·i) represents the external characteristic as described above, so when it is extended and replaced with the function Er(i), it becomes the following formula.

[0083] Irc=∫((Er(i)—v) / Lr)·dt...(3) formula

[0084] This calculation formula is a basic calculation formula of the present invention.

[0085] figure 1 It is a graph showing an example of the function Er(i) of the external characteristic shown by the broken line. In this figure, the horizontal axis represents the welding current i, and the vertical axis ...

Embodiment approach 2

[0102] image 3 It is a graph showing the external characteristic function related to Embodiment 2 of the present invention. In this figure, the horizontal axis represents the welding current i, and the vertical axis represents the output voltage setting value Er. This figure is similar to the above figure 1 Correspondingly, the external characteristics L1 are the same. Hereinafter, description will be made with reference to this figure.

[0103] This graph is composed of three external characteristics L1-L3. The function of the external characteristic L1 is the above (4)

[0104] and (5) formula. The external characteristic L2 is the following function.

[0105] i≦It1 Er=a21·i+b21

[0106] It1

[0107] It2

[0108] In addition, the external characteristic L3 can be expressed by the following formula.

[0109] i≦It1 Er=a31·i+b31

[0110] It1

[0111] The welding state of the external characteristic L1 is an arc gene...

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Abstract

The invention provides an output control method of welding source. In melting electrode arc welding power, the expected external characteristic and inductance are electrically formed, thereby improving the welding quality. The external characteristic functional circuit (ERF) is built-in with a plurality of external characteristics, takes welding current detection signal (id) as input to output the output voltage setting signal (Er) of the welding power. The inductance setting circuit (LR) outputs the inductance setting signal (Lr) for setting the appropriate inductance of the welding power. The current setting variation calculating circuit (DIR) takes the output voltage setting signal (Er), welding voltage detection signal (vd) and inductance setting signal (Lr) as the input to output that current setting variation signal delta Ir=(Er-vd) / Lr. The current setting integrating circuit (IIR) integrates the current setting variation signal (delta Ir) and calculates the welding current control setting signal (Irc). The welding current (i) is output and controlled according to the welding current control setting signal (Irc).

Description

technical field [0001] The present invention relates to an output control method of a welding power source capable of setting an appropriate inductance value and an appropriate external characteristic to desired values ​​in the welding power source. Background technique [0002] Figure 4 It is a structural diagram of a general melting electrode arc welding device. The welding power supply PS is output-controlled so that the external characteristics become constant-voltage characteristics, and outputs a welding voltage v and a welding current i suitable for welding. The welding wire 1 is fed through the inside of the welding torch 4 by the rotation of the feeding roller 5 coupled with the wire feeding motor WM, and is powered via the power supply chip 4 a to generate an arc 3 with the base material 2 . [0003] Figure 5 It is a figure which shows an example of the external characteristic of the above-mentioned welding power supply. In this graph, the horizontal axis repr...

Claims

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Application Information

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IPC IPC(8): B23K9/10B23K9/173
Inventor 上园敏郎
Owner DAIHEN CORP
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