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High-strength and high-toughness metal powder type flux-cored wire with no need of being pre-heated before welded

A flux-cored wire, high-strength and toughness technology, used in metal processing equipment, welding media, welding equipment, etc., can solve the problems of low yield strength of deposited metal, inability to meet strength requirements, mismatched structural steel strength, etc. The effect of high application efficiency, good low temperature impact toughness and high yield strength

Active Publication Date: 2013-04-10
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1) Chinese Patent Application No. 200610014242.1 is a kind of low-hydrogen high-toughness acidic flux-cored welding wire. The flux-cored welding wire involved is slag-type rather than metal-powder type. Strength requirements for structural steel with yield strength greater than 590MPa
[0004] 2) Chinese patent application number 201110131892.5 is an acidic flux-cored welding wire for ultra-low hydrogen and low-temperature steel. The flux-cored welding wire involved is slag type rather than metal powder type. Strength greater than 590MPa structural steel strength does not match
[0006] Search the current existing welding wire patents, there is no flux-cored welding wire that does not need to be preheated before welding and matches the structural steel with a yield strength greater than 590MPa

Method used

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  • High-strength and high-toughness metal powder type flux-cored wire with no need of being pre-heated before welded
  • High-strength and high-toughness metal powder type flux-cored wire with no need of being pre-heated before welded
  • High-strength and high-toughness metal powder type flux-cored wire with no need of being pre-heated before welded

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Embodiment Construction

[0029] Below in conjunction with embodiment this patent is further explained and illustrated. But the scope of protection of this patent is not limited to the specific implementation.

[0030] The silicon content of ferrosilicon in the embodiment is 45%; the molybdenum content of ferromolybdenum is 55%; the titanium content of ferrotitanium is 33%; the carbon content of medium carbon ferromanganese is 1.1%, and the manganese content is 80%. The content of ceria in rare earth oxide is 99.95%.

[0031] The steel sheath of the flux-cored wire is made of 12×0.6, 12×0.8 and 14×1.0mm cold-rolled carbon steel strips, and its chemical composition is shown in Table 1. The steel strip is filled with 16~23% flux core powder, and the finished welding wire with a diameter of 1.2~1.6mm is formed by rolling and drawing. .

[0032] Table 1 Chemical composition of the steel strip used for the manufacture of the flux-cored welding wire of the present invention

[0033]

[0034] Table 2 ...

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Abstract

The invention provides a high-strength and high-toughness metal powder type flux-cored wire with no need of being pre-heated before welded. Steel skin is 79-84% of a total weight of a welding wire and a flux core is 16-21% of the total weight of the welding wire. The steel skin is manufactured by using a cold rolling carbon steel strip and comprises the following components: 0.02-0.055% of C, 0.005-0.0085% of Si, 0.15-0.35% of Mn and the balance of iron; and the flux core comprises the following components: 12-18% of nickel powder, 2-4% of manganese powder, 3-7% of silicon iron, 2-6% of ferro-molybdenum, 0.8-2.5% of ferrotitanium, 1-5% of mid-carbon ferromanganese, 0.8-2.5% of potassium fluosilicate and rear earth oxide in sum, and the balance of iron powder. The flux-cored wire provided by the invention has the advantages of good welding process, high melting efficiency and less slag quantity; the yield strength of deposited metal can be more than 590 MPa; the impact rigidity at a temperature of -50 DEG C can be more than 70J; and the diffusible hydrogen is in an ultralow hydrogen level.

Description

technical field [0001] The invention relates to a gas shielded welding welding material, in particular to a high-strength and toughness metal powder type flux-cored welding wire which does not need to be preheated before welding. Background technique [0002] Flux-cored welding wire has been widely used in the construction of steel structures such as ships, bridges and offshore platforms due to its advantages of good welding processability and high welding efficiency. With the development of society, the strength level of the applied structural steel is getting higher and higher, and the strength of the supporting flux-cored welding wire is also increased, which brings about the problem of crack sensitivity of high-strength weld metal becoming increasingly prominent. At present, there are few high-strength flux-cored wires that match the structural steel with a yield strength greater than 590MPa, and preheating measures are required before welding, and sometimes even post-he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/368
Inventor 彭冀湘薛钢张成杰
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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