Gas shield metal core welding wire used for high-strength steel welding based on ULCB structure

A high-strength steel and gas-shielded technology, which is applied in the direction of welding/welding/cutting articles, welding media, welding equipment, etc., can solve the problems of low impact toughness and high alloying degree of weld metal, and achieve high strength and excellent weld metal Effects of low temperature impact toughness and good arc stability

Active Publication Date: 2014-02-19
江苏伯翰焊接材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] When welding high-strength steel with a tensile strength of 650-1000MPa and excellent low-temperature toughness, using existing welding consumables, the carbon content of the weld metal is higher than that of the base metal, and the alloying degree of the weld metal is relatively high, and the hardenability is relatively high. Significantly larger than the base metal, cold cracking tends

Method used

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  • Gas shield metal core welding wire used for high-strength steel welding based on ULCB structure
  • Gas shield metal core welding wire used for high-strength steel welding based on ULCB structure
  • Gas shield metal core welding wire used for high-strength steel welding based on ULCB structure

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Effect test

Embodiment 1

[0032] Gas-shielded metal-cored welding wire for high-strength steel welding based on ULCB organization, including a sheath and a flux core, the sheath is made of a low-carbon steel strip, and the chemical composition of the low-carbon steel strip is shown in Table 3, wherein the weight percentage of carbon The content is 0.025-0.035%; the width × thickness of the steel strip is 12 × 0.8mm; the chemical composition (weight %) of the core is: manganese: 12%, ferrosilicon alloy: 5.5%, chromium: 2%, nickel: 12% , molybdenum: 3.5%, zirconium silicon alloy: 1.5%, calcium fluoride: 2%, titanium iron: 1.5%, and the remaining 63% is iron powder. The filling rate of the powder in the flux-cored wire is 16.5%.

Embodiment 2

[0034] A gas-shielded metal-cored welding wire for high-strength steel welding based on ULCB structure, including a sheath and a flux core, the material and size of the sheath are the same as in Example 1, and the chemical composition (weight %) of the flux core is: manganese: 10% , ferrosilicon alloy: 5%, chromium: 2%, nickel: 12%, molybdenum: 3%, zirconium silicon alloy: 1%, sodium fluoride: 1%, titanium iron: 0.5%, and the remaining 65.5% is iron powder, The filling rate of the powder in the flux-cored wire is 17.5%.

Embodiment 3

[0036] A gas-shielded metal-cored welding wire for high-strength steel welding based on ULCB structure, including a sheath and a flux core, the material and size of the sheath are the same as in Example 1, and the chemical composition (weight %) of the flux core is: manganese: 12% , ferrosilicon alloy: 4.5%, chromium: 1.2%, nickel: 14%, molybdenum: 3.5%, zirconium silicon alloy: 1.5%, calcium fluoride: 1.5%, titanium ferro: 0.4%, and the remaining 68.5% is iron powder. The filling rate of the powder in the flux-cored wire is 19.2%.

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Abstract

The invention discloses a gas shield metal core welding wire used for high-strength steel welding based on a ULCB structure. The gas shield metal core welding wire comprises an outer skin and a flux core. The outer skin is composed of a mild-carbon steel strip. By weight,, carbon accounts for 0.025-0.035% of the mild-carbon steel strip is. The width of the steel strip is 10-12mm, and the thickness of the steel strip is 0.6-0.8mm. The flux core comprises, by the weight, 7-12% of manganese, 3-16% of ferrosilicon, 0.5-2% of chromium, 8-14% of nickel, 2-4% of molybdenum, 0.5-3% of zirconium silicon alloy, 0.5-3.5% of fluoride and 0.5-3.5% of ferrotitanium, and the balance is iron power. The filling rate of the flux core is 15-21%. Mixed gas of argon and carbon dioxide is selected as shielding gas for welding, and the carbon dioxide content is 5-20%. The metal core welding wire has good welding technology performance, formed weld joints are beautiful, the strength of deposited metal can reach 800-950MPa, and impact toughness at the low temperature of 40 degrees below zero can reach above 60J.

Description

technical field [0001] The invention belongs to the field of welding in material processing engineering, and in particular relates to a high-strength steel metal-cored welding wire used in argon+carbon dioxide mixed gas shielded welding. Background technique [0002] High-strength ultra-low carbon bainitic (ULCB) steel has excellent strength-toughness matching and good weldability, and has been gradually used in ships, oil pipelines, high-rise buildings, large storage tanks and offshore platforms to replace low-alloy High-strength (HSLA) steel, and mainly used in welded structures. [0003] When welding high-strength steel with a tensile strength of 650-1000MPa and excellent low-temperature toughness, using existing welding consumables, the carbon content of the weld metal is higher than that of the base metal, and the alloying degree of the weld metal is relatively high, and the hardenability is relatively high. Significantly larger than the base metal, cold cracking tends...

Claims

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Application Information

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IPC IPC(8): B23K35/24B23K35/363
CPCB23K9/16B23K35/3053B23K35/368B23K2103/04
Inventor 张天理栗卓新荆洪阳马司鸣徐连勇
Owner 江苏伯翰焊接材料有限公司
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