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Arc welding device and arc welding method

A technology of arc welding and welding current, which is applied in the direction of arc welding equipment, welding equipment, manufacturing tools, etc. It can solve the problems of arc instability, inability to effectively suppress magnetic deflection, and difficulty in shortening the arc length, etc., to achieve suppression of magnetic Blow and effect of arc interruption

Active Publication Date: 2019-04-30
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, in the conventional method, since it takes time to detect the magnetic blow, there is a delay from the occurrence of the magnetic blow to the function of the arc interruption prevention control, and the magnetic blow cannot be effectively prevented.
In addition, in high-current welding of 400A or more, the magnetic field generated by the welding current itself becomes larger, and magnetic deflection is more likely to occur than in the case of less than 400A, and the rigidity of the arc cannot be maintained sufficiently in the conventional current control.
Especially in submerged arc welding, it is difficult to shorten the arc length because a space is formed in the molten metal by the arc force
In addition, even if the arc voltage is excessively reduced to forcibly shorten the arc length, the arc will be buried very deeply, welding stability cannot be guaranteed, and a short circuit may occur in some cases, making the arc very unstable
Therefore, the magnetic bias blow cannot be effectively suppressed in the existing method

Method used

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Experimental program
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Effect test

Embodiment approach 1

[0077] figure 1 It is a schematic diagram which shows one structure of the arc welding apparatus concerning this Embodiment 1. The arc welding device according to Embodiment 1 is a consumable electrode type gas shielded arc welding machine for submerged arc welding, and includes a welding power source 1 , a welding torch 2 , and a wire feeder 3 .

[0078] The welding torch 2 is made of conductive material such as copper alloy, guides the welding wire 5 to the welded part of the base material 4, and has the function of providing an arc 7 (refer to image 3 ) The cylindrical shape of the contact tip that produces the required welding current I. The contact tip is in contact with the welding wire 5 inserted inside, and supplies the welding current I to the welding wire 5 . In addition, the welding torch 2 is formed into a hollow cylindrical shape surrounding a contact tip, and has a nozzle for spraying shielding gas to a part to be welded. The shielding gas is used to prevent ...

Embodiment approach 2

[0144] The arc welding apparatus according to Embodiment 2 differs from Embodiment 1 in terms of the configuration related to the setting of the lower limit current value Imin. Therefore, the above-mentioned difference will be mainly described below. Since other structures and effects are the same as those in the embodiment, corresponding parts are assigned the same reference numerals and detailed descriptions are omitted.

[0145] Figure 6 It is a schematic diagram which shows one structure of the arc welding apparatus concerning this Embodiment 2. The arc welding apparatus according to Embodiment 2 includes the same welding power source 201 as Embodiment 1. FIG. The control unit 212 according to Embodiment 2 includes a timer unit 12g that counts the time during which the current value of the welding current I is limited by the limiting unit 12f. The comparison value output from the comparison unit 12e is input to the timing unit 12g, and the timing unit 12g counts the tim...

Embodiment approach 3

[0150] Since the arc welding apparatus according to Embodiment 3 is different from Embodiment 1 in the detection method of magnetic deflection blow, the above-mentioned difference will be mainly described below. Since other configurations and effects are the same as those in the embodiment, corresponding parts are given the same reference numerals and detailed descriptions are omitted.

[0151] Figure 7 It is a schematic diagram which shows one structure of the arc welding apparatus concerning this Embodiment 3. The arc welding device according to Embodiment 3 includes the same welding power source 301 as Embodiment 1. FIG. The comparison unit 12e of the control unit 312 according to Embodiment 3 does not output the current value Id of the welding current I detected by the current detection unit 14, but compares the welding current control setting value Irc output from the constant voltage control unit 12b with With a given threshold value, a comparison value indicating the...

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Abstract

An arc welding device is provided with components of a power supply circuit (11) which supplies welding current through applying welding voltage between a welding wire (5) and a mother material (4); and a control part (12) which makes the set volage of the power supply circuit (11) related to the welding voltage periodically change. The arc welding device generates an arc between the front end ofthe welding wire (5) and the mother material (4) through supplying the welding current so that the front part enters a space which is surrounded by the recessed molten part formed on the mother material (4) through the arc for welding the mother material (4). The arc welding device is provided with a voltage detecting part (13) for detecting the welding voltage, and a current detecting part (14) for detecting the welding current. The control part (12) controls welding current supplying based on the detected welding voltage and the welding current, thereby obtaining a constant-voltage characteristic. When the welding current reduces, deviation from the constant-voltage characteristic is temporarily allowed, thereby maintaining the welding current above a preset lower-limit current value.

Description

technical field [0001] The present invention relates to an arc welding device and an arc welding method. Background technique [0002] One of the welding methods is arc welding of the consumable electrode type. The consumable electrode arc welding method is a technique in which an arc is generated between a welding wire fed to a portion to be welded of a base material and the base material, and the base material is welded by the heat of the arc. It is known that when the base material is a magnetic material, an arc deflection phenomenon or an arc interruption phenomenon called magnetic blow occurs due to a magnetic field generated in the base material, and this causes welding instability and welding defects. [0003] Especially in arc welding in which the welding current is periodically fluctuated during welding, arc interruption due to magnetic blow tends to occur when the welding current decreases. When magnetic blow occurs, the arc is largely deflected by the magnetism,...

Claims

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Application Information

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IPC IPC(8): B23K9/095B23K9/18
CPCB23K9/095B23K9/18
Inventor 马场勇人森大辅
Owner DAIHEN CORP