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Metal powder flux-cored wire for high-strength steel

A technology of flux-cored welding wire and high-strength steel, applied in metal processing equipment, welding media, welding equipment, etc., can solve the problems of not allowing cellulose-type electrodes, high strength, and high sensitivity to cold cracks, and achieve high welding melting Deposition efficiency and deposition speed, improvement of thermal cracking resistance, reduction of welding fume and spatter

Inactive Publication Date: 2012-07-11
KUSN GINTUNE WELDING
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Problems solved by technology

[0003] However, in the welding of X80 steel on the second line of the West-East Gas Pipeline, due to the high strength of this steel type and its high sensitivity to cold cracks, it is not allowed to use cellulose-type electrodes for welding bead priming

Method used

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  • Metal powder flux-cored wire for high-strength steel
  • Metal powder flux-cored wire for high-strength steel

Examples

Experimental program
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Effect test

Embodiment Construction

[0018] A metal powder-type flux-cored wire for high-strength steel, which uses low-P, S low-carbon steel strips as the wire sheath, uses a flux-cored transition alloy, and is manufactured using a general-purpose flux-cored wire manufacturing process. The filling ratio is 10%-20%.

[0019] Select the cold-rolled steel strip, and use the total mass composition of the matching welding wire as shown in Table 1:

[0020] Table 1: Embodiment ①~⑥ drug core composition

[0021]

[0022] The diameter of the welding wire is 1.2mm. After the above-mentioned flux-cored welding wire is made, it is connected with DC reverse, the voltage is 28V, the current is 250A, the dry elongation is 18mm, and the moving speed is 250mm / min. The mechanical properties of the weld are shown in Table 2.

[0023] Table 2 Examples ① ~ ⑥ obtained weld mechanical properties

[0024]

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Abstract

The invention discloses a metal powder flux-cored wire for high-strength steel, which comprises carbon steel sheath and a flux core with the filling ratio of 10-20%. The metal powder flux-cored wire is characterized in that in the overall weight percent of the wire, components in the flux core include 1.00-3.00% of Mn (manganese), 0.20-1.50% of Si (silicon), 0.005-0.050% of F (fluorine), 0-0.1% of Ti (titanium) and 0-0.004% of B (boron). The flux-cored wire is applicable to backing weld of the high-strength steel of an X80 pipeline, and when in welding, deposition efficiency is high, speed is high, arc is stable, splash is little, a welding bead is smooth and beautiful in appearance, and post-welding slag is little.

Description

technical field [0001] The invention belongs to the field of welding materials and relates to a shielding gas welding flux-cored welding wire, which is especially suitable for welding X80 pipeline steel. Background technique [0002] Pipeline transportation is mainly used for long-distance transportation of oil and natural gas. It has the remarkable characteristics of economy, safety, uninterrupted, and less damage to the environment. Therefore, countries all over the world are vigorously developing it. In order to adapt to the complex geological conditions and climate environment along the transportation, its development trend is high strength and high toughness. [0003] However, in the welding of X80 steel on the second line of the West-East Gas Pipeline, due to its high strength and high sensitivity to cold cracks, it is not allowed to use cellulose-type electrodes for welding bead priming. Contents of the invention [0004] In order to solve the above problems, the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30
Inventor 蔡鸿祥庄石城
Owner KUSN GINTUNE WELDING
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