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Double-wire feeding arc welding method and multi-layer surfacing method

An arc welding method, welding method technology, applied in the direction of arc welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of insufficient undercut filling and weakened surface tension, etc., achieve efficient reciprocating welding, suppress unevenness, Suppresses undercut and underfill effects

Active Publication Date: 2008-02-06
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Document 3, the molten pool is brought into a high-temperature state by the heat input from the two arcs, and the surface tension is weakened, so occurrences of undercut and underfill are not improved.
Furthermore, due to constraints caused by the interference between the two arcs, the distance between the two welding wires may not be set to the desired distance at which the high-speed weldability is maximized.

Method used

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  • Double-wire feeding arc welding method and multi-layer surfacing method
  • Double-wire feeding arc welding method and multi-layer surfacing method
  • Double-wire feeding arc welding method and multi-layer surfacing method

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Effect test

Embodiment approach 1

[0034] Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings.

[0035] FIG. 1 is a configuration diagram of a double wire feed arc welding device according to Embodiment 1 of the present invention. This figure shows the case where the first welding wire 11 is used as the preceding welding wire, and the second welding wire 12 is used as the following welding wire. The following description will be made with reference to this figure.

[0036] The welding power supply PS outputs the welding voltage Vw and the welding current Iw between the power supply core 4 and the base metal 2 in order to generate the arc 3 for the first welding wire 11 (leading welding wire), and outputs to control the rotation of the first feeding motor M1 The first feed control signal Fc1 and the second feed control signal Fc2 for controlling the rotation of the second feed motor M2.

[0037] The first feeding motor M1 rotates and drives the first feeding roll...

Embodiment approach 2

[0051] FIG. 4 is a diagram showing a multi-layer build-up welding method using the above-mentioned double wire feed arc welding method according to Embodiment 2 of the present invention. The first welding wire 11 and the second welding wire 12 are fed from one welding torch 6, and the welding torch 6 is reciprocated to perform welding of each layer. The figure (A) shows the time of moving the welding torch 6 in the forward direction and welding, and the figure (B) shows the time of moving the welding torch 6 in the direction of the return and welding. Hereinafter, description will be made with reference to this figure.

[0052] As shown in the figure (A), when welding in the forward direction, the first welding wire 11 is used as the leading welding wire, and the second welding wire 12 is used as the following welding wire. Therefore, the arc 3 is generated between the first welding wire 11 as the preceding welding wire and the base material 2 to perform molten electrode arc ...

Embodiment approach 3

[0060] Since construction machinery, keels / bridges, etc. are welded structures with thick plates, the amount of deposited metal at the welded part needs to be large, and the welding construction takes a long time. Therefore, recently, welding work has often been carried out with a welded joint of a narrow cut in which the cut width becomes narrow and the cut depth becomes deep. In such narrow-gap welding, as described above, when a material that reduces the viscosity of the molten metal is used for the base material or the welding wire, undercut and insufficient filling tend to occur.

[0061] Fig. 6 is a cross-sectional view of a welded part with a narrow gap. As shown in the figure, crystal grains called columnar crystals of the welded portion formed by the narrow gap welded joint meet at the central portion of the weld metal. Furthermore, the width of the bead is relatively narrow relative to the depth of fusion, so that the central portion where the heat-shrinking crystal...

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Abstract

In the double-wire feeding arc welding method of the present invention, the first (leading) welding wire (11) and the second (backward) welding wire (12) that are insulated from each other are fed from the welding nozzle (6) at the front end of the welding torch, and the molten metal Welding the low-viscosity iron and steel materials, the welding current (Iw) is energized in the above-mentioned leading welding wire, and the arc (3) is generated to form a molten pool (21). The above-mentioned molten pool (21) under the pressure of the electric arc (3) is excavated to the raised position. Therefore, when welding iron and steel materials with low molten metal viscosity, a good bead shape without unevenness, undercut, and underfill can be obtained.

Description

technical field [0001] The present invention relates to a technique for improving the welding performance of a double wire feed arc welding method in which two wires are fed close together for welding. Background technique [0002] Conventionally, various double wire feeding arc welding methods have been proposed in which two welding wires are fed from one or more welding torches to perform welding. The double wire feed arc welding method enables high deposition welding and high-speed welding compared to the general molten electrode arc welding method using one wire. Hereinafter, conventional techniques related to this double wire feed arc welding method will be described. [0003] (Prior Art 1) [0004] In the molten electrode arc welding method of prior art 1 described in Patent Document 1, the leading welding wire and the following welding wire are inserted into the tip under the condition that the angle formed by the leading welding wire and the following welding wire ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/12B23K9/04
Inventor 上山智之大绳登史男三田常夫
Owner DAIHEN CORP
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