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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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Example Embodiment
[0079] [Embodiment 1]
[0080] The basic calculation formula used in the output control method of the welding power source according to the present invention will be described below. Among 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 equation (2) holds.
[0081] Irc=∫((Er—v—Rr·i) / Lr)·dt
[0082] Here, (Er-Rr·i) represents the external characteristics as described above, so when it is expanded and replaced as a function Er(i), it becomes the following equation.
[0083] Irc=∫((Er(i)—v) / Lr)·dt......(3)
[0084] This arithmetic is the basic arithmetic 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 a broken line. The horizontal axis of the graph represents the welding current i, and the vertical axis represents ...
Example Embodiment
[0101] [Embodiment 2]
[0102] image 3 This is a graph showing the external characteristic function related to Embodiment 2 of the present invention. The horizontal axis of the graph represents the welding current i, and the vertical axis represents the output voltage setting value Er. The figure and the above figure 1 Correspondingly, the external characteristics L1 are the same. Hereinafter, description will be made with reference to the figure.
[0103] The graph is composed of three external characteristics L1 to 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 equation.
[0109] i≦It1 Er=a31·i+b31
[0110] It1
[0111] The welding state of the external characteristic L1 is the arc gener...
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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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