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Nickel base 625 welding wire of single-surface welding and double-surface molding argon arc backing welding without argon filling on back surface

A technology of single-sided welding, double-sided welding, and bottoming welding, which is applied to welding media, welding equipment, welding/cutting media/materials, etc. The welding seam is beautiful and the welding process is excellent.

Inactive Publication Date: 2016-04-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, tungsten argon arc welding (TIG) bottoming and argon filling on the back are generally used in the welding process of nickel-based 625 alloy pipes. Unstable welding quality and difficulty in implementing argon filling in some special environments

Method used

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  • Nickel base 625 welding wire of single-surface welding and double-surface molding argon arc backing welding without argon filling on back surface
  • Nickel base 625 welding wire of single-surface welding and double-surface molding argon arc backing welding without argon filling on back surface
  • Nickel base 625 welding wire of single-surface welding and double-surface molding argon arc backing welding without argon filling on back surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The ENiCrMo3T nickel-based 625 welding wire used for welding nickel-based alloy pipes uses 10×0.4mm nickel strip 625 as the outer skin (the composition is shown in Table 1), the filling rate is 22.5%, and the wire diameter is 2.0mm. The chemical composition (weight %) of drug core is: TiO 2 : 3.0%, SiO 2 : 2.0%, ZrO 2 : 1.7%, MnO 2 : 0.9%, Al 2 o 3 : 2.2%, MgO: 0.3%, NbO: 2.0%; Fe2 o 3 : 4.0%, Cr: 21.4%, Mo: 8.2%, Nb: 1.9%, MoFe: 3.0%, Co: 0.4%, Ce: 0.3%, and the balance is nickel powder. The front uses pure Ar as the shielding gas, the gas flow rate is 15-20L / min, the DC reverse connection method is adopted, and the welding current is 90-110A.

Embodiment 2

[0039] The ENiCrMo3T nickel-based 625 welding wire used for welding nickel-based alloy pipes uses 12×0.5mm nickel strip 625 as the outer skin (the composition is shown in Table 1), the filling rate is 30%, and the welding wire diameter is 2.4mm. The chemical composition (weight %) of drug core is: TiO 2 : 4.2%, SiO 2 : 0.9%, ZrO 2 : 1.5%, MnO 2 : 0.9%, Al 2 o 3 : 3.0%, MgO: 0.3%, NbO: 2.4%; Fe 2 o 3 : 4.0%, Cr: 20.5%, Mo: 8.2%, Nb: 2.3%, MoFe: 2.7%, Co: 0.5%, and the balance is nickel powder. The front uses pure Ar as the shielding gas, the gas flow rate is 15-20L / min, the DC reverse connection method is adopted, and the welding current is 120-150A.

Embodiment 3

[0041] The ENiCrMo3T nickel-based 625 welding wire used for welding nickel-based alloy pipes uses 8×0.3mm nickel strip 625 as the sheath (the composition is shown in Table 1), the filling rate is 18%, and the wire diameter is 2.0mm. The chemical composition (weight %) of drug core is: TiO 2 : 2.6%, SiO 2 : 1.1%, ZrO 2 : 1.0%, MnO 2 : 1.1%, Al 2 o 3 : 0.3%, MgO: 0.5%, NbO: 2.8%; Fe 2 o 3 : 3.5%, Cr: 20.4%, Mo: 7.7%, Nb: 6.6%, MoFe: 3.0%, Co: 0.5%, Ce: 0.4%, and the balance is nickel powder. The front uses pure Ar as the shielding gas, the gas flow rate is 15-20L / min, the DC reverse connection method is adopted, and the welding current is 90-110A.

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Abstract

The invention discloses a nickel base 625 welding wire of single-surface welding and double-surface molding argon arc backing welding without argon filling on a back surface, and belongs to the technical field of material processing engineering. A nickel strip 625 skin is adopted; a flux-cored wire comprises the following components in percentage by weight: 3-12% of TiO2, 1-6% of SiO2, 0.1-3% of ZrO2, 0.1-3% of MnO2, 0.1-5% of Al2O3, 0.1-2% of MgO, 2-6% of NbO, 2-4% of Fe2O3, 15-30% of Cr, 5-15% of Mo, 3-8% of Nb, 1-6% of MoFe, 0.1-2% of Co, 0-1% of Ce, and the balance of nickel powder; and the flux-cored filling rate is 15-40%. The welding wire is used for welding a nickel base alloy pipe, is excellent in high-temperature fluidity of welding slag and welding line deposited metal, can realize single-surface welding and double-surface molding without needing argon filling on the back surface, excellent in back surface protection of welding slag and beautiful in molding of welding lines on frontal and back surfaces.

Description

technical field [0001] The invention belongs to the technical field of material processing engineering, and in particular relates to a nickel-based 625 welding wire for single-side welding and double-side forming argon arc bottom welding without argon filling on the back. technical background [0002] According to reports from the International Nickel Research Group (INSG) and the World Bureau of Metal Statistics (WBMS), the global nickel production-to-consumption ratio is gradually decreasing, and the demand for nickel in countries around the world is increasing year by year. Because of its excellent high-temperature mechanical properties and high-temperature corrosion resistance, nickel-based alloy pipes are widely used in nuclear power, marine oil production, shipbuilding and metallurgy industries. Inconel625 (Ni-Cr-Mo-Nb) alloy tube is a nickel-based superalloy with excellent corrosion resistance. It has the manufacturing certification of pressure vessels with a wall tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3033B23K35/406
Inventor 栗卓新王恒
Owner BEIJING UNIV OF TECH
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