Flux-cored wire for electrogas welding and electrogas welding metal

A gas-electric welding and welding wire technology, which is applied in the field of 1-electrode gas-electric welding flux-cored wire and gas-electric welding metal, can solve the problems of difficulty in obtaining elongation, deterioration of toughness, high tensile strength, etc., and achieve excellent welding workability, good impact value, The effect of high elongation

Active Publication Date: 2009-08-12
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, if a large amount of alloying elements such as Mn, Ni, and Mo are added from the welding wire in this way, the dilution of the base metal is likely to change due to the voltage deflection during welding construction, etc., so the chemical composition of the weld metal fluctuates drastically, and it has been confirmed that it is not possible to meet the requirements. The condition of the specified performance
[0007] In particular, from the standpoint of construction efficiency, the demand from users is to develop welding wires that can be applied to a wide range of plate thicknesses from thin plates to thick plates. Welding wires for thick steel materials, because alloy components are added to ensure strength, Therefore, in the relative thin plate, the tensile strength becomes too high, and it is difficult to obtain the elongation in the tensile test, and it is confirmed that the elongation of 22% relative to the ship class standard applied in the shipbuilding field is insufficient.
In addition, toughness also tends to deteriorate

Method used

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  • Flux-cored wire for electrogas welding and electrogas welding metal
  • Flux-cored wire for electrogas welding and electrogas welding metal
  • Flux-cored wire for electrogas welding and electrogas welding metal

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Embodiment Construction

[0050] Conventionally, Ni has been mainly added to the welding wire to improve the strength reduction and toughness of the weld metal due to the increase in welding heat energy due to thickening. Therefore, even when the plate thickness of the welded plate is as thick as 60 mm, it has been confirmed that the amount of Ni in the gas welding metal becomes 2% by mass or more. However, if a welding wire with a large Ni content is used to weld a relatively thin 25mm welded plate, the heat energy will decrease and the hardenability will increase. direction, but the strength becomes too high due to an excessively large alloy composition mainly composed of Ni, and a tendency to deteriorate the toughness and make it difficult to obtain elongation is confirmed. Therefore, the inventors of the present invention have developed a component that can effectively deal with the decrease in strength and the deterioration of toughness even if the amount of the alloy component is small when the t...

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PUM

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Abstract

The invention relates to a flux-cored wire for electrogas welding, in the total quality of wire, including 0.03 to 0.07 quality % of C, 0.3 to 0.8 quality % of Si, 1.5 to 2.2 quality % of Mn, 0.4 to 1.5 quality % of Ni, 0.05 to 0.60 quality % of Cr and Mo, 0.02 to 0.20 quality % of Ti, 0.005 to 0.020 quality % of B, and 0.20 to 0.50 quality % of Mg, wherein, the Al is equal to or less than 0.10%, with 1.0 to 2.0% of slagging agent. The slagging agent, in the total quality of the wire, includes 0.30 to 0.70 quality % of F and 0.02 to 0.20 quality % of K, wherein, the [A]=(Cr+Mo) / Ni is equal to 0.10 to1.0 and [B]=C / (Ti+20*B) is equal to 0.12 to 0.58. With the components, the invention can increase the intensity, extension rate and the flexibility of the welded metal, with more excellent welding operation.

Description

technical field [0001] The present invention relates to a single-electrode gas-electric welding flux-cored wire and a gas-electric welding metal capable of performing vertical one-layer bead welding with a plate thickness of 25 mm to 70 mm. Background technique [0002] As a high-efficiency vertical welding method, electrogas arc welding is used in a wide range of fields such as ships, oil storage tanks and bridges. In recent years, with the rapid economic and industrial development of China and East Asian countries, the increase in the size of container ships has been rapidly promoted for the purpose of efficient transportation of containerized cargo due to the increase in logistics volume. [0003] Along with the increase in size of container ships, thickening of ship side shells, hatch coamings, and the like is advancing, and steel plates having a plate thickness of 50 mm or more are used. As a construction method capable of efficiently welding such thick steel plates, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/368B23K35/30
CPCB23K35/3066C22C38/002C22C38/02C22C38/04C22C38/50C22C38/54C22C38/58
Inventor 石崎圭人桥本哲哉
Owner KOBE STEEL LTD
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