Welding device

A welding device and welding voltage technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as difficult to manage input heat or weld bead shape, achieve stable droplet growth, high welding stability, and prevent deformation get unstable effect

Active Publication Date: 2013-03-27
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, it is difficult to manage the heat input or bead shape by adjusting the set voltage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0038] figure 1 It is a block diagram of the welding apparatus of Embodiment 1.

[0039] 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 .

[0040] The power control device 104 controls the power circuit 102 so that the welding current Iw and the welding voltage Vw output to the welding torch 4 become values ​​suitable for welding.

[0041] 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 is discharged 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 circuit FC, a feeding motor...

Embodiment approach 2

[0099] In Embodiment 1, the magnitude of the high-level current was changed based on the voltage difference between the set voltage Vr and the average voltage Va, but in Embodiment 2, the magnitude of the high-level current was changed based on the voltage difference between the set voltage Vr and the average voltage Va. figure 2 The period of the indicated high-level current (the first arc period Ta1).

[0100] Figure 7 It is a block diagram showing the structure of 100 A of welding apparatuses of Embodiment 2. In the following description, only the parts different from Embodiment 1 will be described, and the same parts as Embodiment 1 will be given the same reference numerals, and the description will not be repeated.

[0101] 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 .

[0102] The power control device 104A is in figure 1 The configuration of the p...

Embodiment approach 3

[0111] In Embodiment 1, only the amplitude center current setting signal Ihcr is increased or decreased based on the voltage difference (Vr-Va), that is, the voltage error signal Vh. In Embodiment 2, only the first arc is increased or decreased based on the voltage difference. Period Ta1.

[0112] In Embodiment 3, upper and lower thresholds are set for the voltage difference, only the amplitude center current setting signal Ihcr is increased or decreased until the threshold, and only the first arc period Ta1 is increased or decreased for a voltage difference exceeding the threshold or a voltage difference smaller than the threshold.

[0113] Figure 8 It is a block diagram showing the structure of welding apparatus 100B of Embodiment 3. In the following description, only the parts different from Embodiment 1 will be described, and the same parts as Embodiment 1 will be given the same reference numerals, and the description will not be repeated.

[0114] refer to Figure 8, ...

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Abstract

The invention provides a welding device, realizing stable growth of molten drops and stable generation of an electric arc. The welding device (100) comprises a power circuit (102) and a power control device (104). The power control device (104) controls the power circuit (102) in the following way that a high-level current is outputted within a first electric arc period (Ta1) at the early stage of an electric arc period after the short-circuit period; and an electric arc current corresponding to a welding voltage controlled by a constant voltage is outputted within a second electric arc period (Ta2) at the later stage of the electric arc period. In addition, the power control device (104) controls the power circuit (102) in the way that the high-level current is generated by superposing a waveform which is increased and decreased repeatedly on a vibration amplitude center current. Furthermore, the power control device (104) makes the vibration amplitude center current higher or lower in accordance with the reduction of the voltage difference between an average voltage (Va) and a rated voltage (Vr). In this way, under the condition that the rated voltage is changed, an increase of the difference between the average voltage and the rated voltage is rapidly eliminated, and the electric arc is kept stable.

Description

technical field [0001] The present invention relates to a welding device, in particular to a welding device for carbon dioxide arc welding. Background technique [0002] Japanese Patent Publication No. 4-4074 (Patent Document 1) discloses a consumable-electrode arc welding method in which short-circuiting and arc generation are repeated between a consumable electrode and a base material. In this consumable electrode arc welding method, the formation process of the droplet and the transition process of the droplet to the base material are repeated. [0003] Figure 13 It is a diagram for explaining the consumable-electrode arc welding method in which short-circuiting and arc generation are repeated. [0004] refer to Figure 13 , in the consumable-electrode arc welding method in which short-circuiting and arc generation are repeated, the processes (a) to (f) described below are repeatedly performed in order. (a) The initial short-circuit state when the droplet is in contact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/073B23K9/10
Inventor 井手章博惠良哲生
Owner DAIHEN CORP
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