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Flux-cored wire, welding method, and weld metal

A technology of flux-cored welding wire and welding wire, applied in the field of welding metal, can solve the problems of low welding speed, burn-through, weld bead or undercut bead shape, etc. Effect

Active Publication Date: 2021-11-09
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In such a posture where the molten pool is affected by gravity, such as a vertical welding posture, if the welding current is increased or the welding speed is increased, it is easy to cause burn-through, welding flashes, and poor bead shape such as undercuts.
Therefore, in welding in this posture, it is necessary to perform welding at a low welding speed in a low current range, and there is room for improvement from the viewpoint of the efficiency of the welding operation.
Especially for overhead welding, in the welding posture, since the molten pool is most significantly affected by gravity, it is most necessary to reduce the welding current and welding speed, and it is difficult to improve the energy efficiency.

Method used

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  • Flux-cored wire, welding method, and weld metal
  • Flux-cored wire, welding method, and weld metal
  • Flux-cored wire, welding method, and weld metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～13

[0250]

[0251] Using a flux-cored wire having a composition shown in Table 1 or 2, a welding test was carried out according to the above (welding conditions). In addition, in the composition of the flux, oxides and carbonates were not actively added in Examples 1 to 13, and the content of oxides and carbonates relative to the total mass of the welding wire was 0.5 for all flux-cored wires. %the following.

[0252] [Table 1]

[0253] Table 1

[0254]

[0255] [Table 2]

[0256] Table 2

[0257]

[0258] Contains only BaF as fluoride powder in flux 2 This kind of flux-cored wire of Comparative Example 1 also contains SrF as fluoride powder 2 , AlF 3 and CaF 2 When one or more fluorides are selected from the group formed, a significant improvement in the wire feeding speed can be seen, which is a result of excellent weldability.

[0259] In addition, by making the composition of the fluoride powder appropriate, even in overhead welding with a welding current of 2...

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Abstract

The present invention relates to a flux-cored wire for positive polarity gas-shielded arc welding use, in which a flux contains a metal powder and also contains BaF2 and SrF2 and AlF3 and / or CaF2 as fluorides wherein the content of BaF2 is 1.0 to 4.5%, the content of SrF2 is 2.0% or less, the content of CaF2 is 0.45% or less and the content of AlF3 is 0.70% or less, at least one of metal elements constituting the flux and the fluorides is a strong deoxidizing metal element having a specified standard formation Gibbs energy, and the content of each of an oxide and a carbonate in the flux is 0.5% or less.

Description

technical field [0001] The present invention relates to a flux-cored welding wire, and particularly relates to a flux-cored welding wire which is suitable for all-position welding and is excellent in welding operability and welding efficiency. In addition, the present invention relates to a welding method and a weld metal using the flux-cored wire. Background technique [0002] For a long time, flux-cored welding wire has versatility, and can be applied to all postures including flat welding, vertical welding, horizontal welding, and overhead welding. However, welding is more difficult in horizontal welding, vertical welding, and overhead welding than in flat welding, and it is difficult to obtain good welding operability in all postures. [0003] In this regard, Patent Document 1 discloses a flux-cored wire for gas-shielded arc welding, which combines Al, Mg and BaF 2 The necessary flux components are contained in specific amounts, and the flux filling rate and the conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/368B23K35/30
CPCB23K35/0266B23K35/362B23K35/3602B23K35/3605B23K35/3053B23K35/383C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54B23K35/368
Inventor 迎井直树泉谷瞬八岛圣
Owner KOBE STEEL LTD
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