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A seamless self-shielded flux-cored wire for welding low-nitrogen and non-magnetic naval steel

A technology of flux-cored welding wire and self-protection, applied in welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problem that it is difficult to achieve full-position repair, there is no public report on self-protecting flux-cored welding wire, and it must be in the workshop. To achieve the effect of excellent welding process performance, stable arc and fast solidification speed

Active Publication Date: 2022-03-04
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Welding processes such as MIG shielded welding and laser welding must be carried out in the workshop due to the limitation of equipment
Thermite welding is a kind of self-propagating welding technology. It has the characteristics of simple operation conditions and no need for electricity and gas. It can quickly repair the damaged armor in the field environment, but it can only be repaired on the plane and it is difficult to achieve all-position repair.
However, there is no public report on the self-shielding flux-cored wire matching the low-nitrogen non-magnetic naval steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0037] The preparation method of the seamless self-shielding flux-cored wire is: filling the flux-core powder in the stainless steel strip drawn into an O shape, and then undergoing high-frequency welding, diameter reduction and surface ceramic spraying, that is, It is a seamless self-shielded flux cored wire for welding low nitrogen and nonmagnetic naval steel.

[0038] The diameter of the seamless self-shielding flux-cored welding wire is 1.6 mm.

[0039] The purity of the barium fluoride is ≥99%, and the particle size of the barium fluoride is ≤0.3mm.

[0040] The purity of the marble is ≥99%, and the particle size of the marble is ≤0.3mm.

[0041] The purity of the aluminum powder is ≥99%, and the particle size of the aluminum powder is ≤0.3mm.

[0042] The Si content of the silicon powder is 74-76 wt%, and the particle size of the silicon powder is ≤0.3mm.

[0043] The purity of the manganese powder is ≥99%; the particle size of the manganese powder is ≤0.3mm.

[0044...

Embodiment 1

[0054] A seamless self-shielded flux-cored wire for welding low-nitrogen and non-magnetic naval steel. The seamless self-shielding flux-cored welding wire described in this embodiment is the same as the specific implementation mode except for the following.

[0055] The seamless self-protecting flux-cored welding wire is composed of 70wt% stainless steel strip and 30wt% flux core powder.

[0056] The chemical composition and content thereof of the stainless steel strip are: C is 0.03wt%; Si is 1wt%; Mn is 1.8wt%; Cr is 18wt%; Ni is 8wt%; P is 0.003wt%; S is 0.006 wt%; the balance is Fe and unavoidable impurities.

[0057] The chemical composition and content of the drug core powder are: 40wt% barium fluoride; 5wt% marble; 8wt% aluminum powder; 2wt% silicon powder; 7wt% manganese powder; 2wt% manganese nitride %; nickel powder is 10wt%; chromium powder is 5wt%; iron powder is 21wt%.

[0058] The mechanical properties of the weld metal formed by the seamless self-shielding fl...

Embodiment 2

[0060] A seamless self-shielded flux-cored wire for welding low-nitrogen and non-magnetic naval steel. The seamless self-shielding flux-cored welding wire described in this embodiment is the same as the specific implementation mode except for the following.

[0061] The seamless self-protecting flux-cored welding wire is composed of 75wt% stainless steel strip and 25wt% flux core powder.

[0062] The chemical composition and content thereof of the stainless steel strip are: C is 0.08wt%; Si is 0.8wt%; Mn is 1.7wt%; Cr is 20wt%; Ni is 11wt%; P is 0.02wt%; 0.02wt%; the balance is Fe and unavoidable impurities.

[0063] The chemical composition and content of the drug core powder are: barium fluoride is 41wt%; marble is 6wt%; aluminum powder is 9wt%; silicon powder is 3wt%; manganese powder is 8wt%; manganese nitride is 3wt% %; nickel powder is 11wt%; chromium powder is 6wt%; iron powder is 13wt%.

[0064] The mechanical properties of the weld metal formed by the seamless self...

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Abstract

The invention relates to a seamless self-protected flux-cored welding wire for low-nitrogen non-magnetic ship steel welding. The technical scheme is as follows: the seamless self-protecting flux-cored welding wire is composed of 70-80wt% stainless steel strip and 20-30wt% flux-cored powder, and the flux-cored powder is filled in the stainless steel strip. The chemical composition and content of the stainless steel strip are: C is 0.03-0.08wt%, Si≤1wt%, Mn≤2wt%, Cr is 18-20wt%, Ni is 8-11wt%, S≤0.03wt%, P ≤0.03wt%, the balance is Fe and inevitable impurities; the chemical composition and content of the core powder are: barium fluoride is 40-43wt%, marble is 5-8wt%, aluminum powder is 8-8 10wt%, silicon powder is 2-4wt%, manganese powder is 7-10wt%, manganese nitride is 2-5wt%, nickel powder is 10-13wt%, chromium powder is 5-7wt%, and the balance is iron powder. The welding seam metal formed by the method for welding low-nitrogen non-magnetic ship steel has high strength, good plasticity and toughness, non-magnetic properties and excellent seawater corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of seamless self-protecting flux-cored welding wire. In particular, it relates to a seamless self-shielded flux-cored welding wire for welding low-nitrogen and non-magnetic naval steel. Background technique [0002] 917 non-magnetic steel is a non-magnetic steel with Mn-Al composition developed in my country in the 1960s and 1970s. It is the main steel used in shipbuilding. Its carbon content and alloy composition are relatively high, and it belongs to a completely non-magnetic single-phase austenite structure. Carbon steel. With the gradual development of ships with large displacement, large tonnage and deep sea, new requirements are put forward for the strength and corrosion resistance of steel used for hull structures. Although the comprehensive performance of 917 steel is good, although it can meet the design and use requirements of various ships for many years, the actual value of the yield strength is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/368B23K35/40
CPCB23K35/3086B23K35/3616B23K35/368B23K35/406B23K35/0266
Inventor 王红鸿孟庆润
Owner WUHAN UNIV OF SCI & TECH
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