Submerged-arc welding flux for high-strength steel with strength not smaller than 780MPa, manufacture method and welding wire

A high-strength steel, submerged arc welding technology, used in arc welding equipment, welding media, manufacturing tools, etc., can solve the problem of blank flux for submerged arc welding, and achieve low crack sensitivity, high toughness and crack sensitivity. Effect

Inactive Publication Date: 2013-04-03
ATLANTIC CHINA WELDING CONSUMABLES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Major domestic steel mills such as Baosteel and Anshan Iron and Steel have developed high-strength steel varieties and series products with a strength level of ≥780MPa, but the corresponding flux for submerged arc welding is still blank

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] SiO 2 5kg, MgO 32kg, Al 2 o 3 24kg, CaF 2 28 kg, CaO 4.0 kg, MnO 2.0 kg, TiO 2 Put 5.0 kg of powder in a mixer, stir and mix evenly, add 18 kg of sodium water glass to mix and granulate, then bake at a low temperature of 150°C, sinter at a high temperature of 750°C, and sieve to obtain a flux product.

[0057] Match the flux with special welding wire (the components of the welding wire are: C 0.083, Mn 1.75, Si 0.12, S 0.004, P 0.009, Cr 0.30, Ni 2.88, Mo 0.46, Cu 0.15, and the balance is Fe) by weight percentage, for a thickness of 20mm The submerged arc welding experiment of the Q690D steel plate has excellent welding process performance. The mechanical properties of the weld metal are as follows: the tensile strength of the welded joint is 800-840MPa, the hardness of the weld is 215-255HV10, and the Charpy impact energy of the weld is Akv (-40°C) = 95-115J; Charpy impact energy in the heat-affected zone is Akv (-40°C) = 90-110J.

[0058] The chemical composi...

Embodiment 2

[0060] SiO 2 7kg, MgO 35kg, Al 2 o 3 22kg, CaF 2 26 kg, CaO 4.0 kg, MnO 4.0 kg, TiO 2 Put 2.0 kg of industrial pure powder in a mixer, stir and mix evenly, add 18 kg of sodium silicate to mix and granulate, then bake at 150°C, sinter at 750°C, and sieve to obtain flux products.

[0061] The flux is matched with special welding wire (the components of the welding wire are: C 0.083%, Mn 1.75%, Si 0.12%, S 0.004%, P 0.009%, Cr 0.30%, Ni 2.88%, Mo 0.46%, Cu 0.15% , the balance is Fe), the submerged arc welding experiment is carried out on the 20mm thick Q690D steel plate, the welding process performance is excellent, the mechanical properties of the weld metal are tested: the tensile strength of the welded joint is 790-830MPa, and the hardness of the weld is 210 -248HV10, the Charpy impact energy of the weld is Akv (-40°C) = 90-110J; the Charpy impact energy of the heat-affected zone is Akv (-40°C) = 90-115J.

[0062] The chemical composition of the high-strength steel pl...

Embodiment 3

[0064] SiO 2 8kg, MgO 38kg, Al 2 o 3 18kg, CaF 2 25 kg, CaO 5.0 kg, MnO 3.0 kg, TiO 2 Put 3.0kg of industrial pure powder in a mixer, stir and mix evenly, add 18 kg of sodium silicate to mix and granulate, then bake at 150°C, sinter at 750°C, and sieve to obtain flux products.

[0065] The flux is matched with special welding wire (the components of the welding wire are: C 0.083%, Mn 1.75%, Si 0.12%, S 0.004%, P 0.009%, Cr 0.30%, Ni 2.88%, Mo 0.46%, Cu 0.15% , the balance is Fe), the submerged arc welding experiment is carried out on the 20mm thick Q690D steel plate, the welding process performance is excellent, the mechanical properties of the weld metal are tested: the tensile strength of the welded joint is 795-835MPa, and the hardness of the weld is 210 -248HV10, the Charpy impact energy of the weld is Akv (-40°C) = 100-125J; the Charpy impact energy of the heat-affected zone is Akv (-40°C) = 90-110J.

[0066] The chemical composition of the high-strength steel pl...

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Abstract

The invention discloses a submerged-arc welding flux for high-strength steel with a strength level not smaller than 780MPa, relating to the field of welding. The welding flux comprises the following components in percentage by weight: 5-13% of SiO2, 30-40% of MgO, 15-30% of Al2O3, 20-30% of CaF2, 1-4% of CaO, 2-6% of MnO and 1-6% of TiO2. The welding rod flux, disclosed by the invention, is matched with a special welding wire to weld the high-strength steel with the strength level not smaller than 780MPa, and a welding seam has the excellent properties such as high strength, high toughness and low crack sensitivity similar to those of a high-strength steel body.

Description

technical field [0001] The invention relates to a flux, in particular to a flux, a preparation method and a special welding wire for submerged arc welding of high-strength steel with a strength level ≥ 780 MPa. Background technique [0002] With the rapid development of science and technology, low-alloy high-strength steel has been widely used, and the application of high-strength steel with a strength level of ≥780MPa in important projects such as vehicles, cranes, pressure vessels, construction machinery, petrochemicals, and power generation equipment is also increasing. widely. Because of their high strength and impact toughness, they meet the performance requirements of various fields and are very popular among people. [0003] Countries around the world also pay special attention to the development and research of high-strength steel with a strength level of ≥780MPa. Through technological innovation or the addition of trace elements, more and more varieties and series ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362B23K35/30B23K9/18
Inventor 杨飞贾兴旺
Owner ATLANTIC CHINA WELDING CONSUMABLES
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