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Back slag self-protecting flux-cored wire for T92/P92 steel tungsten electrode argon arc backing weld

A technology of argon tungsten arc and flux-cored wire, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of complicated process and low efficiency, and achieve the effect of simplifying the construction process and improving production efficiency

Active Publication Date: 2011-03-09
CHINA ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the argon-arc back welding of T92 / P92 steel mostly adopts back argon protection measures, the process is complicated and the efficiency is low, and there is no report on the flux-cored welding wire that realizes the self-protection of slag on the back.

Method used

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  • Back slag self-protecting flux-cored wire for T92/P92 steel tungsten electrode argon arc backing weld
  • Back slag self-protecting flux-cored wire for T92/P92 steel tungsten electrode argon arc backing weld
  • Back slag self-protecting flux-cored wire for T92/P92 steel tungsten electrode argon arc backing weld

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A high-quality low-carbon steel strip-coated alloy powder with a width of 13 mm and a thickness of 0.3 mm is selected. The composition and content of the powder are (expressed in mass fraction): fluorite: 3%, rutile: 28%, and quartz: 5%. , Feldspar: 3%, Cryolite: 3%, Sodium Carbonate: 1%, Metal Manganese: 7%, Ferrosilicon: 4%, Nickel Powder: 2%, Chromium Powder: 26%, Molybdenum Powder: 1.5%, Tungsten Iron: 3.5%, ferro-vanadium: 1.5%, ferro-niobium: 0.4%, ferro-boron: 0.2%, manganese nitride: 0.8%, the rest is iron powder; filling rate: 37-39%.

Embodiment 2

[0029] A high-quality low-carbon steel strip-coated alloy powder with a width of 13 mm and a thickness of 0.3 mm is selected. The composition and content of the powder are (expressed in mass fraction): fluorite: 4%, rutile: 24%, and quartz: 8%. , Feldspar: 2%, Cryolite: 7%, Sodium Carbonate: 2%, Metal Manganese: 5%, Ferrosilicon: 3%, Nickel Powder: 3%, Chromium Powder: 24%, Molybdenum Powder: 1.2%, Tungsten Iron: 4%, ferro-vanadium: 2.5%, ferro-niobium: 0.6%, ferro-boron: 0.3%, manganese nitride: 1.0%, the rest is iron powder; filling rate: 36-38%.

Embodiment 3

[0031] A high-quality low-carbon steel strip-coated alloy powder with a width of 13 mm and a thickness of 0.3 mm is selected. The composition and content of the powder are (expressed in mass fraction): fluorite: 2%, rutile: 22%, and quartz: 6%. , Feldspar: 4%, Cryolite: 5%, Sodium Carbonate: 1.5%, Metal Manganese: 3%, Ferrosilicon: 2%, Nickel Powder: 4%, Chromium Powder: 28%, Molybdenum Powder: 0.8%, Tungsten Iron: 5%, ferro-vanadium: 3.5%, ferro-niobium: 0.8%, ferro-boron: 0.4%, manganese nitride: 1.2%, the rest is iron powder; filling rate: 35-37%.

[0032] After the welding wires prepared in Examples 1, 2 and 3 were made into samples according to the following welding specifications, the composition of the deposited metal (as shown in Table 1) and the mechanical properties at room temperature (as shown in Table 2) were measured according to the requirements of relevant standards. Shown) and high-temperature short-term mechanical properties (as shown in Table 3).

[0033] T...

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Abstract

The invention provides a back surface slag melting self protection flux-cored wire for T92 / P92 steel tungsten electrode argon arc backing weld and belongs to the material processing engineering welding filed. The aim of the invention is to provide a welding wire for argon arc backing weld which has simple welding process and high efficiency. The welding wire adopts a steel belt bag to cover alloypowder. A fill rate is between 35 and 39 percent, and the powder of the flux-cored wire consists of the following components in weight percentage: 2 to 4 percent of fluorite, 22 to 28 percent of rutile, 5 to 8 percent of quartz, 2 to 4 percent of feldspar, 3 to 7 percent of cryolite, 1 to 2 percent of sodium carbonate, 3 to 7 percent of metallic manganese, 2 to 4 percent of ferrosilicon, 2 to 4 percent of nickel powder, 24 to 28 percent of chromium powder, 0.8 to 1.5 percent of molybdenum powder, 3.5 to 5 percent of ferrotungsten, 1.5 to 3.5 percent of ferrovanadium, 0.4 to 0.8 percent of ferroniobium, 0.2 to 0.4 percent of ferroboron, 0.8 to 1.2 percent of nitrogenized manganese and the balance of iron powder. The welding wire has the advantages of the welding seam back surface slag melting self protection, simple construction process and the like.

Description

technical field [0001] The invention belongs to the field of welding in material processing engineering, and in particular relates to a back slag self-protection agent suitable for the bottom weld bead bottoming welding of the small-diameter tube T92 used for the superheater and reheater of the power station boiler and the thick-walled tube P92 steel used for the main steam pipeline cored wire. Background technique [0002] With the rapid development of the power industry, TP2 / P92 steel developed by Japan has been widely used in the construction of supercritical and ultra-supercritical thermal power units. At present, the bottom argon arc bottom welding of T92 / P92 steel mostly adopts back argon protection measures, the process is complicated and the efficiency is low, and there is no report on the flux cored wire that realizes the back slag self-protection. Contents of the invention [0003] The purpose of the present invention is to solve the problems in the prior art, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/362
Inventor 陈玉成徐德录韩钰丛相州李现兵马光聂京凯王立全
Owner CHINA ELECTRIC POWER RES INST