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Alternating current arc welding power supply

A technology of welding power supply and AC arc, which is applied in the direction of arc welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of uneven welding quality, achieve good welding quality, and shorten the effect of current drop period

Active Publication Date: 2008-11-12
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, welding quality varies due to changes in weldability

Method used

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  • Alternating current arc welding power supply
  • Alternating current arc welding power supply
  • Alternating current arc welding power supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0094] figure 1 It is a block diagram of the AC arc welding power supply related to Embodiment 1 of the present invention. In this figure, for the above Figure 10 The same symbols are assigned to the same blocks, and descriptions thereof are omitted. Below, yes and Figure 10 The different dotted boxes are illustrated.

[0095] A series circuit composed of the first switching element TR1 and the first resistor R1 is connected in parallel with the second electrode negative polarity switching element TN2. And the series circuit formed by the second switching element TR2 and the second resistor R2 is connected in parallel with the positive polarity switching element TP1 of the first electrode.

[0096] The first period control circuit SNP1 takes the electrode negative period setting signal Tnr, the electrode positive period setting signal Tpr and the comparison signal Cp as inputs, as will be described later figure 2 As shown, output electrode negative period signal Stn, el...

Embodiment approach 2

[0107] image 3 It is a block diagram of the AC arc welding power supply related to the second embodiment of the present invention. In this figure, for the above Figure 10 or figure 1The same symbols are assigned to the same blocks and their explanations are omitted. Hereinafter, different blocks indicated by dotted lines will be described.

[0108] A parallel connection composed of the third switching element TR3 and the third resistor R3 is inserted between the DC voltage generated by the secondary rectifier group D2a~d and the polarity switching circuit (the bridge formed by TN1~2 and TP1~2). circuit. The second period control circuit SNP2 takes the electrode negative period setting signal Tnr, the electrode positive period setting signal Tpr and the comparison signal Cp as inputs, such as Figure 4 As described above, the electrode negative period signal Stn, the electrode positive period signal Stp, the electrode negative polarity switching element control signal Sn...

Embodiment approach 3

[0116] Figure 5 It is a block diagram of the AC arc welding power supply related to Embodiment 3 of the present invention. This figure is the situation of the main circuit of the power supply which generates positive and negative DC voltage types by the secondary rectifier group D2a-d. Therefore, the polarity switching circuit is formed by one electrode negative polarity switching element TN and one electrode positive polarity switching element TP. In this figure, for the above Figure 10 or figure 1 The same symbols are assigned to the same blocks, and descriptions thereof are omitted. Hereinafter, different blocks will be described.

[0117] The series circuit composed of the first switching element TR1 and the first resistor R1 is combined with figure 1 Similarly, it is connected in parallel with the electrode negative polarity switching element TN. In addition, the series circuit composed of the second switching element TR2 and the second resistor R2 is combined wi...

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PUM

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Abstract

This invention provides an alternating current arc welding power, which reduces the current to a ruled value when the polarity is switched and in non-melting / melting the electrode arc welding. Because the reducing speed can be accelerated without the effect of loading state, so that the steady welding can be maintained. When the electrode straight polarity is switched to the negative polarity, a second electrode straight polarity switch component (TP2) forming a bridge circuit is only enabled to be in the conducting state, and a second switch component (TR2) is in the conducting state; the second resistor (R2) is inserted into a conducting circuit to improve the reducing speed of the circuit, at the same time, when the electrode negative polarity is switched to the electrode straight polarity, a first electrode straight polarity switch component (TP2) forming a bridge circuit is only enabled to be in the conducting state, and a first switch component (TR2) is in the conducting state; the first resistor (R1) is inserted into a conducting circuit to improve the reducing speed of the circuit.

Description

technical field [0001] The present invention relates to an AC arc welding power source capable of switching output polarity at high speed in AC non-melting electrode arc welding or AC melting electrode arc welding to improve weldability. Background technique [0002] In the following description, the case of the AC non-melting electrode arc welding power source is given as the AC arc welding power source, but the same applies to the case of the AC melting electrode arc welding power source. [0003] Figure 10 It is a block diagram showing a conventional AC non-melting electrode arc welding power source. Each block will be described below with reference to this figure. [0004] The inverter circuit INV takes a commercial power supply such as three-phase 200V as input, rectifies / smooths it to generate a DC voltage, and performs inverter control to output a high-frequency AC voltage based on an error amplification signal Ea described later. The high-frequency transformer INT...

Claims

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Application Information

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IPC IPC(8): B23K9/10
Inventor 西坂太志
Owner DAIHEN CORP