A flux-cored wire for soldering diphasic stainless steel

A technology of duplex stainless steel and flux-cored welding wire, applied in welding medium, welding equipment, welding/cutting medium/material, etc., to achieve the effect of fine spatter particles, good pitting corrosion resistance and less spatter particles

Active Publication Date: 2008-04-09
CHANGZHOU XINDE WELDING MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when welding duplex stainless steel, the use of traditional austenitic stainless steel welding consumables cannot meet the requirements of pitting corrosion and impact toughness of its joints. Therefore, a flux-cored welding wire specially designed for 2205 duplex stainless steel is developed to make its joints have Good pitting resistance, excellent impact toughness and reasonable two-phase structure

Method used

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  • A flux-cored wire for soldering diphasic stainless steel
  • A flux-cored wire for soldering diphasic stainless steel
  • A flux-cored wire for soldering diphasic stainless steel

Examples

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Embodiment Construction

[0030] All the welding wires in the examples are produced by the "FCWM50 Flux Core Wire Drawing Machine" manufactured by Kunming Heavy Machinery Factory: 304L austenitic stainless steel strips with a width of 8-12mm and a thickness of 0.25-0.5mm are selected. First roll it into a U shape, and then add mixed medicinal powder with a particle size of 80 mesh sieves into the U-shaped groove, and the filling rate of the medicinal powder is 17-24%. Close the U-shaped groove so that the powder is wrapped in it.

[0031] The specific implementation plan is as follows:

[0032] 1. Use 8×0.25 (width 8mm, thickness 0.25mm) 304L stainless steel strip. Roll it into a U shape first. Get 35 grams of metallic chromium powder, 13 grams of metallic molybdenum powder, 3 grams of metallic nickel powder, 5 grams of metallic manganese powder, 4 grams of aluminum-magnesium alloy powder, 1 gram of ferrosilicon powder, 5 grams of quartz powder, 0 gram of zircon powder, Feldspar powder 4 grams, rutile...

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Abstract

The invention relates to a flux-cored wire for welding duplex stainless steel, and the flux-cored wire is used in the welding field of the material processing technology. During the welding of the duplex stainless steel, joint pitting erosion and impact elasticity can not be met by utilizing austenite stainless steel welding material. The invention provides the flux-cored wire for welding the duplex stainless steel, 17 percent to 24 percent flux-cored powder is filled into stainless steel belt. The invention is characterized in that the mass percent of the components of the flux-cored is as follows: 35 percent to 40 percent of chromium powder, 11 percent to 15 percent of molybdenum powder, 2 percent to 4 percent of nickel powder, 3 percent to 5 percent of manganese powder, 1 percent to 5 percent of magnesia chrome, 1 percent to 3 percent of ferrosilicon, 4 percent to 9 percent of rock crystal, 2 percent to 6 percent of feldspar, 21 percent to 30 percent of rutile, 0.5 percent to 4 percent of Al2O3, 0 percent to 5 percent of zircon, 0.5 percent to 3 percent of Bi2O3, and 0.5 percent to 3 percent of manganese nitride. The invention leads the duplex stainless steel welding joint to have the anti good pitting erosion performance and the good impact elasticity.

Description

technical field [0001] It belongs to the field of welding in material processing engineering. The invention is mainly used in the welding of 2205 duplex stainless steel widely used in natural gas, oil pipelines, heat exchangers, pressure vessels, ships, aircraft, transportation tools, military and other fields. Background technique [0002] With the development of modern industrial technology, traditional austenitic stainless steel has exposed its insufficient resistance to local corrosion such as stress corrosion, pitting corrosion and crevice corrosion, especially the fracture caused by stress corrosion, which is extremely harmful. Duplex Stainless Steels (DSS for short) combines the advantages of austenitic stainless steel and ferritic stainless steel, has good toughness, strength and weldability, and its yield strength can reach twice that of ordinary stainless steel; its excellent The neutral chloride stress corrosion resistance far exceeds that of 18-8 austenitic stain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/22B23K35/30
Inventor 栗卓新李伟李国栋魏琪
Owner CHANGZHOU XINDE WELDING MATERIAL TECH
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