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Low-hydrogen electrode with favorable low-temperature impact toughness

A low-temperature impact toughness, low-hydrogen welding rod technology, used in welding media, manufacturing tools, welding equipment, etc., can solve the problems of welding rod arc instability, welding defects, uneven slag coverage, etc., to achieve good welding process performance, improve low temperature Effect of reducing impact toughness and low temperature brittleness

Active Publication Date: 2015-04-29
TIANJIN GOLDEN BRIDGE WELDING MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, low-hydrogen electrodes achieved the purpose of reducing the hydrogen content by increasing the fluorite content. However, too much fluorite content will lead to unstable arc and uneven slag coverage, which directly leads to poor process performance of the electrode and damage to the welding process. Insufficient pool metal protection and eventual weld defects

Method used

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  • Low-hydrogen electrode with favorable low-temperature impact toughness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A low-hydrogen welding rod, using H08A wire rod as the welding core material, the mass percentage of each component in the coating of the welding rod is:

[0015] 40% marble, 16% fluorite, 6% silicon powder, 6% ferromanganese, 7% ferrosilicon, 9% ferrotitanium, 5% rutile, 2% mica, 8% iron powder, and 1% magnesium powder. The particle size of the fluorite powder is 100% over 100 mesh.

[0016] The mass component content and particle size requirements of each component in the coating of the electrode are:

[0017] Marble: CaCO 3 ≥95%, S≤0.020%, P≤0.010%, 100% passing mesh particle size is 60 mesh; Fluorite: CaF 2 ≥95%, SiO 2 ≤4.5%, S≤0.020%, P≤0.030%, 100% passing mesh particle size is 100 mesh; silicon powder: SiO 2 ≥98%, Al 2 o 3 ≤1.0%, S≤0.010%, P≤0.015%, 100% passing mesh particle size is 250 mesh; ferromanganese: Mn: 78~85%, C≤1.5%, S≤0.020%, P≤0.020%, 100 % The particle size of passing mesh is 60 mesh; ferrosilicon: Si: 43.5~46%, Mn≤0.7%, S≤0.02%, P≤0.040%, 1...

Embodiment 2

[0019] A low-hydrogen electrode, its components and the mass percentage ratio of each component are the same as in Example 1, except that the particle size of fluorite powder is 100% and over 120 mesh.

Embodiment 3

[0021] A low-hydrogen welding rod, its components and the mass percentage ratio of each component are the same as in Example 1, except that the particle size of fluorite powder is 100% and exceeds 150 mesh.

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Abstract

The invention provides a low-hydrogen electrode with favorable low-temperature impact toughness, wherein the electrode using corresponds to a top low-carbon steel H08A welding core of the requirement of GB / T3429-2002, and electrode medicine skin comprises the following components in percentage by weight: 35-45% of marble, 15-18% of fluorite, 4-8% of silicon micro powder, 4-8% of ferromanganese, 5-8% of ferrosilicon, 8-11% of ferrotitanium, 3-6% of rutile, 1-3% of mica, 6-10% of ferrous powder and 0.5-1.5% of magnesium powder, wherein the fluorite is characterized in that CaF2>=95%, SiO2<=4.5%, S<=0.020%, P<=0.030%, and 100% of meshes of granularity is 100 meshes of fluorite. According to the invention, through controlling the adding amount of fluorite and controlling the fluorite granularity 100% of 100 meshes, the obtained low-hydrogen electrode has good welding process performance, and the welding seam tissue low-temperature brittleness is lowered obviously.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a low-hydrogen welding rod with good low-temperature impact toughness. Background technique [0002] In actual production, especially in industries such as energy, petroleum, various liquefied gas storage and transportation, and pipeline construction, due to environmental conditions, steel and weld structures are required to have good low-temperature impact toughness to avoid formation of cold crack. The occurrence of weld cold cracks is related to the distribution of stress, strain and hydrogen in the local area of ​​welded joints. Therefore, in order to avoid the occurrence of cracks, the welding structure is required to be reasonably designed, and at the same time, higher requirements are placed on the hydrogen content in the weld. [0003] The reduction of hydrogen content in the deposited metal of low-hydrogen carbon steel electrodes mainly depends on the dehydrogenation r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/365B23K35/30
Inventor 侯来昌王力唐艳丽
Owner TIANJIN GOLDEN BRIDGE WELDING MATERIALS GRP
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