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welding device

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, prevent instability, and high welding stability. Effect

Active Publication Date: 2016-05-04
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

PROBLEM TO BE SOLVED: To provide a welding device capable of achieving a stable growth of droplets and stable generation of an arc. SOLUTION: The welding device 100 includes an electric power supply circuit 102 and a power supply controller 104. The power supply controller 104 controls the electric power supply circuit 102 such that a high level current is output in a first arc period Ta1 in an initial period of an arc period subsequent to a short circuit period and an arc current corresponding to a constant voltage controlled welding voltage is output in a second arc period Ta2 in a latter period of the arc period. In addition, the power supply controller 104 controls the electric power supply circuit 102 to superimpose a repeatedly increasing and decreasing waveform on an amplitude center current so as to generate a high level current. Furthermore, the power supply controller 104 calculates a recommended voltage Vc corresponding to a current set value of a welding current and increases or decreases the amplitude center current Ihcr depending on a voltage difference between the recommended voltage Vc and a voltage set value Vr of a welding voltage. In this way, the arc is prevented from being unstable even when the voltage set value Vr is altered.

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 Patents(China)
IPC IPC(8): B23K9/16B23K9/10
Inventor 井手章博惠良哲生
Owner DAIHEN CORP
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