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Flux-cored wire for gas protection of arc welding

A gas shielded and arc welding technology, which is applied in the direction of arc welding equipment, welding medium, welding equipment, etc., can solve problems such as difficulty in maintaining the shape of the weld bead and easy sagging of welded metal, and achieve the effect of improving strength and ensuring stability

Active Publication Date: 2013-09-18
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the vertical forward welding in the high current region using the flux-cored wire described in Patent Document 2, there is a problem that the weld metal tends to sag and it is difficult to maintain a good bead shape.

Method used

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  • Flux-cored wire for gas protection of arc welding
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  • Flux-cored wire for gas protection of arc welding

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no. 1 Embodiment approach 》

[0022] The first embodiment relates to a mild steel flux-cored welding wire.

[0023] The gas-shielded arc welding flux-cored wire of the present invention contains a specified amount of oxygen that forms particles.

[0024] Titanium oxide raw material, C, the total of the Si-equivalent amount of metal Si and the Si-equivalent amount of Si oxide, the Si-equivalent amount of metal Si, Mn, the total of the Al-equivalent amount of metal Al, and Mg, and the Na-equivalent amount of Na compounds and the total of the K-equivalent amount in the K compound, and the F-equivalent amount in the F compound. In addition, the flux filling rate based on the total mass of the welding wire is a predetermined amount.

[0025] In addition, the titanium oxide raw material has a predetermined amount of TiO2 based on the total mass of the titanium oxide raw material. 2 , Si, Al, Mn, Fe, Mg, Ca, and there is an oxide containing any one or more of Ti, Fe, Mn, Al, and Si on the particle surface of th...

no. 2 Embodiment approach 》

[0075]The second embodiment relates to FCW corresponding to low-temperature toughness. In the second embodiment, in order to achieve low temperature toughness at -40°C, predetermined amounts of B and Ni are added to the flux-cored wire of the first embodiment, and the contents of Cr, Nb, and V are limited to predetermined amounts.

[0076]

[0077] B segregates at the γ grain boundary, has the effect of suppressing the formation of proeutectoid ferrite, and is effective for improving the toughness of the weld metal. When the B content based on the total mass of the wire is less than 0.0003% by mass, most of B is immobilized as nitrides as BN, the effect of suppressing the formation of proeutectoid ferrite disappears, and no improvement in toughness can be recognized. On the other hand, when it exceeds 0.0130% by mass, the strength of the weld metal increases remarkably and the toughness decreases.

[0078] Therefore, the B content is 0.0003 to 0.0130% by mass.

[0079]

...

no. 3 Embodiment approach 》

[0086] The third embodiment relates to FCW corresponding to ultra-low temperature toughness. In the third embodiment, predetermined amounts of B and Ni, and Cr and Nb are added to the flux-cored wire of the first embodiment. The content of V is limited to a predetermined amount, and by adding a predetermined amount of metal Ti, toughness can be ensured even at an extremely low temperature of -60°C. In addition, Mo may be contained in a predetermined amount.

[0087]

[0088] Metal Ti refers to one or more of "pure metal Ti" and "alloy Ti".

[0089] Ti refines crystal grains and has a deoxidizing effect and an effect of improving toughness. When the Ti-equivalent amount of metal Ti based on the total mass of the welding wire is less than 0.05% by mass, the effect cannot be confirmed. On the other hand, when it exceeds 0.40% by mass, a large amount of Ti compounds such as TiC precipitates, the strength increases remarkably, and the toughness decreases. Therefore, the Ti eq...

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Abstract

The present invention provides a flux-cored wire for gas protection of arc welding which guarantees normal welding work at high current and form a good weld bead when the welding is performed vertically. The flux-cored wire for gas protection of arc welding contains prescribed quantity of titanium oxide, C, the combination of silicon convertion amount of metal silicon and silicon conversion amount of silicon oxide, silicon conversion amount of metal silicon, combination of aluminum conversion amount and magnesium, combination of sodium conversion amount of sodium compound and kalium conversion quantity of kalium compound, and fluorine conversion amount of fluorine compound. Filling ratio of flux is limited. Titanium oxide comprises prescribed amounts of titanium dioxide, silicon, aluminum, iron, magnesium and calcium, and a compound formed by more than one of the titanium, the iron, the magnesium, aluminum and silicon exists on the surface of a particle. Furthermore, in the oxide, the percent of the atoms of the aluminum and the silicon meets the formulation of 1<=Al+Si<=10.

Description

technical field [0001] The invention relates to a gas-shielded arc welding flux-cored welding wire. Background technique [0002] Conventionally, gas-shielded arc welding using a flux-cored wire has been performed in various fields in order to efficiently perform welding work. In all-posture welding, a titanium dioxide-based flux-cored wire with good welding workability and bead shape is often used (for example, refer to Patent Document 1). In various industries that mostly use such welding materials, there is a growing demand for higher energy efficiency in welding operations in order to further reduce costs and shorten construction periods. [0003] In response to such a request, a technology for preventing the sticking of slag and improving slag detachability has been disclosed (for example, refer to Patent Document 2). [0004] [Patent Document 1] Japanese Patent Laid-Open No. S56-39193 [0005] [Patent Document 2] JP-A-57-190798 [0006] However, in vertical forward...

Claims

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Application Information

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IPC IPC(8): B23K35/22B23K9/16
CPCB23K9/16B23K35/22B23K35/3608B23K35/368B23K35/24
Inventor 柿崎智纪小池贵之笹仓秀司佐藤统宣
Owner KOBE STEEL LTD
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