Welding set

A welding device and arc welding method technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as arc instability, achieve stable droplet growth, high welding stability, and prevent instability Effect

Active Publication Date: 2013-03-06
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the set voltage is set extremely large or extremely small relative to the recommended voltage, the arc will easily become unstable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0037] figure 1 It is a block diagram of the welding apparatus concerning Embodiment 1.

[0038] refer to figure 1 , The welding device 100 includes: a power circuit 102 , a power control device 104 , a welding wire feeding device 106 , and a welding torch 4 .

[0039] The power supply control device 104 controls the power supply circuit 102 so that the welding current Iw and the welding voltage Vw output to the welding torch 4 become values ​​suitable for welding.

[0040] The welding wire feeding device 106 feeds the welding wire 1 to the welding torch 4 . Although not shown in the figure, shielding gas mainly composed of carbon dioxide gas is released from the tip portion of the welding torch 4 . An arc 3 is generated between the welding wire 1 protruding from the tip of the welding torch 4 and the base material 2 , and the welding wire 1 is melted to weld the base material 2 . The wire feeding device 106 includes a feeding speed setting circuit FR, a feeding control ci...

Embodiment approach 2

[0098] In Embodiment 1, the magnitude of the high-level current is changed based on the voltage difference between the set voltage Vr and the reference voltage Vcr, but in Embodiment 2, based on the voltage difference between the set voltage Vr and the reference voltage Vcr, voltage difference to make figure 2 The period of the indicated high-level current (the first arc period Ta1 ) changes.

[0099] Figure 7 It is a block diagram showing the structure of 100 A of welding apparatuses concerning Embodiment 2. In the following description, only the parts different from Embodiment 1 will be described, and the same symbols as those in Embodiment 1 will be assigned the same symbols and will not be described repeatedly.

[0100] refer to Figure 7 , The welding device 100A includes: a power circuit 102 , a power control device 104A, a welding wire feeding device 106 and a welding torch 4 .

[0101] The power control device 104A is in figure 1 In the configuration of the ill...

Embodiment approach 3

[0110]In the first embodiment, only the amplitude center current setting signal Ihcr is increased or decreased according to the voltage difference (Vr-Vcr), and in the second embodiment, only the first arc period Ta1 is increased or decreased.

[0111] In Embodiment 3, upper and lower thresholds are set for the voltage difference, and only the amplitude center current setting signal Ihcr is increased or decreased until the threshold value is reached. For the voltage difference exceeding the threshold value or the voltage difference smaller than the threshold value, only the first arc period Ta1 increases and decreases.

[0112] Figure 8 It is a block diagram showing the structure of the welding apparatus 100B which concerns on Embodiment 3. In the following description, only the parts different from Embodiment 1 will be described, and the same symbols as those in Embodiment 1 will be assigned the same symbols and will not be described repeatedly.

[0113] refer to Figure ...

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Abstract

The present invention provides a welding set which can realize stable droplet growth and stable arc production. The welding device (100) have a power supply circuit (102) and a power control unit (104). The power control unit (104), in accordance with during the short circuit after the next arc during the initial 1 (Ta1) during the arc current and the output level in the late stage of arc during 2 of the arc (Ta2) during the period of output with a constant voltage control of the welding arc voltage corresponding to the current mode control switching power supply circuit (102). The power supply control device which according to increase or decrease will be repeated to produce waveform in the center of the amplitude of the current high level of current mode control power circuit. The power control device which corresponds to the current setting of the welding current, can calculate the recommended voltage value, according to the recommended voltage and the voltage setting of the welding voltage is the voltage between message center current increase or decrease amplitude. Thus, even if the voltage value is changed, unstable arc can also be prevented.

Description

technical field [0001] The invention relates to a welding device, in particular to a welding device for carbon dioxide gas arc welding. Background technique [0002] Japanese Patent Publication No. 4-4074 (Patent Document 1) discloses a molten electrode arc welding method in which short circuits and arc generation are repeated between a molten electrode and a base material. The melting electrode arc welding method repeats the formation process of the droplet and the transition process of the droplet to the base metal. [0003] Figure 13 It is a diagram for explaining the molten electrode arc welding method in which short circuits and arc generation are repeated. [0004] refer to Figure 13 , in the molten electrode arc welding method that repeats short circuit and arc generation, the processes (a) to (f) described below are repeated in order. (a) The initial state of the short circuit when the droplet is in contact with the molten pool; (b) The middle stage of the short ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/10
Inventor 井手章博惠良哲生
Owner DAIHEN CORP
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