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Alkaline flux-cored wire for pipeline girth welding and up-and-down feeding automatic welding

A technology of automatic welding and flux-cored wire, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of low efficiency, achieve the effects of reducing defects, small transition particles, and strong arc force

Inactive Publication Date: 2020-05-26
KUSN GINTUNE WELDING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the efficiency of this process is lower than that of downward welding, more welding consumables are required for large-angle grooves, and the rutile flux core contains relatively high hydrogen content, and most of the hydrogen content of the welding wire deposited metal is greater than 4ml / 100g

Method used

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  • Alkaline flux-cored wire for pipeline girth welding and up-and-down feeding automatic welding
  • Alkaline flux-cored wire for pipeline girth welding and up-and-down feeding automatic welding
  • Alkaline flux-cored wire for pipeline girth welding and up-and-down feeding automatic welding

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Embodiment Construction

[0028] The technical solutions of the present invention will be further described below in conjunction with specific examples, but the present invention is not limited to these examples.

[0029]A basic flux-cored wire used for pipeline ring welding and automatic welding from top to bottom. It is composed of a carbon steel sheath covering a flux-cored welding wire.

[0030] Table 1 Carbon steel skin component content

[0031] C Si mn Al 0.010-0.030 0.01-0.03 0.10-0.30 0.005～0.035 P S Fe 0.005-0.010 0.005-0.010 margin

[0032] The weight of the flux core accounts for 12.5% ​​to 21.0% of the total weight of the welding wire. Table 2 shows the weight percentages of the flux core components in the examples except iron.

[0033] The specification of the welding wire of the present invention is 0.045-0.062 or 1.2mm-1.6mm.

[0034] The operability test uses the base metal X70 and X80 pipes, and the specifications and components are shown i...

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Abstract

The invention discloses an alkaline flux-cored wire for pipeline girth welding and up-and-down feeding automatic welding. A flux core comprises the following components of aluminum, magnesium, manganese, silicon, nickel, molybdenum, carbon, aluminum-magnesium oxide, manganese-iron-silicon oxide, barium fluoride, lithium fluoride, other arc stabilizers, rare metal yttrium, lanthanum and cerium elements and the balance iron and other unavoidable impurities. The alkaline flux-cored wire can meet the requirements of upward feeding, downward feeding, hot welding, filling and cosmetic welding of a pipeline and is used for automatic welding of the pipeline, a welding joint can meet the tensile requirement of an X70 / X80 pipeline, and the Charpy impact value of the joint at the temperature of 40 DEG C below zero can reach 54 J.

Description

technical field [0001] The invention belongs to the field of welding materials, and in particular relates to an alkaline flux-cored welding wire used for pipe ring welding and automatic welding from top to bottom. Background technique [0002] The long-distance pipeline girth welding welding process includes root welding, heat welding, filling and covering. One of the application processes is: root welding with cellulose hand electrodes first, followed by self-protected semi-automatic welding filling and covering. This kind of process has high requirements on welder's technique and technology, and it is easy to cause weld bead defects such as slag inclusion and lack of fusion due to improper human operation; and in the application of automatic pipeline welding, if mixed gas gas shielded solid or metal powder core welding wire is used, Generally, it is welded with a narrow groove from the bottom, and the precision of groove preparation is high. Special equipment or power sup...

Claims

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Application Information

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IPC IPC(8): B23K35/02B23K35/30
CPCB23K35/0266B23K35/3053
Inventor 周峙宏庄石城林祐禾
Owner KUSN GINTUNE WELDING
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