Low-spatter ultralow-hydrogen welding rod excellent in minus 100 DEG C impact toughness

A technology of impact toughness and ultra-low hydrogen, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems affecting the weld forming performance and destroying the arc stability, so as to improve low temperature toughness and enhance welding Process performance, effect of overcoming spatter problem

Inactive Publication Date: 2017-06-13
HAINING RUIAO METAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of a large amount of fluorite will destroy the stability of the arc and affect the weld formability

Method used

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  • Low-spatter ultralow-hydrogen welding rod excellent in minus 100 DEG C impact toughness
  • Low-spatter ultralow-hydrogen welding rod excellent in minus 100 DEG C impact toughness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The composition (percentage by weight) of the coating includes: 12% marble, 4% fluorite, 14% cryolite, 3% strontium carbonate, 2% zirconium quartz, 0.2% boron iron, 1.8% nickel-magnesium alloy, 1.6% aluminum-silicon alloy, Rare earth oxide 1.2%, alginate 0.5%, feldspar 0.2%, and appropriate amount of binder.

[0040] After conversion, the sum of silicon content in zirconium quartz and aluminum-silicon alloy is 2.6%.

[0041] The welding core material (weight percentage) includes 0.02% C, 0.003% S, 0.004% P, 5% Ni, 1% Mo, 0.2% Nb, and the rest is Fe and unavoidable impurities.

[0042]After the above-mentioned coating is prepared, it is sent into a pressure coating machine to be wrapped on the welding core, and then dried and baked to produce the welding rod of the present invention.

Embodiment 2

[0044] The composition (percentage by weight) of the coating includes: 6% marble, 1% fluorite, 20% cryolite, 1% strontium carbonate, 0.2% zirconium quartz, 0.5% boron iron, 3% nickel-magnesium alloy, 3% aluminum-silicon alloy, 0.2% rare earth oxide, 0.8% alginate, 0.8% mica, 3% ferronickel, and appropriate amount of binder.

[0045] After conversion, the sum of silicon content in zirconium quartz and aluminum-silicon alloy is 2.5%.

[0046] The welding core material (weight percentage) includes 0.01% C, 0.002% S, 0.003% P, 0.5% Ni, 2% Mo, 0.1% Nb, and the rest is Fe and unavoidable impurities.

[0047] After the above-mentioned coating is prepared, it is sent into a pressure coating machine to be wrapped on the welding core, and then dried and baked to produce the welding rod of the present invention.

Embodiment 3

[0049] The composition (percentage by weight) of the coating includes: 18% marble, 5% fluorite, 5% cryolite, 5% strontium carbonate, 3% zircon quartz, 0.1% boron iron, 0.5% nickel-magnesium alloy, 0.6% aluminum-silicon alloy, Rare earth oxide 2%, alginate 0.2%, feldspar 0.4%, mica 0.4%, nickel iron 2%, molybdenum iron 1%, and an appropriate amount of binder.

[0050] After conversion, the sum of silicon content in zirconium quartz and aluminum-silicon alloy is 2.7%.

[0051] The welding core material (weight percentage) includes 0.01% C, 0.001% S, 0.004% P, 1.5% Ni, 1% Mo, 0.5% Nb, and the rest is Fe and unavoidable impurities.

[0052] After the above-mentioned coating is prepared, it is sent into a pressure coating machine to be wrapped on the welding core, and then dried and baked to produce the welding rod of the present invention.

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Abstract

The invention discloses a low-spatter ultralow-hydrogen welding rod excellent in minus 100 DEG C impact toughness. The low-spatter ultralow-hydrogen welding rod excellent in minus 100 DEG C impact toughness comprises a coating and a core wire, and is characterized in that the coating is composed of, by weight, 5-20% of marble, 1-5% of fluorite, 5-20% of cryolite, 1-5% of strontium carbonate, 0.1-3% of zircon, 0.1-0.5% of ferroboron, a proper amount of binder and the like; and the core wire is low-sulfur low-phosphorous low-alloy steel composed of, by weight, 0-0.1% of C, 0-0.004% of S and 0-0.005% of P. The welding rod is low in spatter, ultralow in weld metal hydrogen, excellent in low-temperature toughness and adaptive to all-position welding.

Description

technical field [0001] The invention relates to an electric welding electrode for low-temperature steel, in particular to an electric welding electrode for low-temperature steel with ultra-low hydrogen content. Background technique [0002] The world's economic and social development has driven the rapid development of the energy field. Spherical tanks and related storage and transportation equipment used to store ethylene, liquefied petroleum gas, and liquefied natural gas have driven the development of low-temperature steel and supporting welding materials. [0003] Due to the complex structure of the tank body, the high degree of construction constraints, and the need for field construction, etc., cold welding cracks often occur, which damages the welding quality and brings hidden dangers to structural safety. The hydrogen content of welding diffusion directly determines the cold crack sensitivity, so the industry continues to use ultra-low hydrogen welding consumables. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/365B23K35/40B23K35/30
CPCB23K35/0261B23K35/3053B23K35/3066B23K35/3602B23K35/3605B23K35/365B23K35/404
Inventor 李晶
Owner HAINING RUIAO METAL TECH CO LTD
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