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Gas protection welding wire for low-magnetic steel

A technology of gas shielding and low magnetic steel, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of unstable austenite structure, easy decomposition, high cost, etc., and achieve stable austenite structure , low thermal cracking sensitivity, and low relative permeability

Inactive Publication Date: 2016-12-21
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When welding low-magnetic steel with these two welding materials, the weld is not a pure austenite structure, which is unfavorable to the magnetic permeability of the joint; the austenite structure of the weld is unstable, and it is easy to decompose and produce cracks; it is easy to appear during the welding process. Porosity and inclusions
[0005] The AT-Y316L special stainless steel flux cored wire for low magnetic steel involved in literature [4], because its carbon content is too different compared with the base metal, it is easy to appear hardened structure on the weld side of the welded joint fusion zone, which is easy to cause weld Cracking; carbon migration bands appear on the carbon steel side, reducing the performance of the joint; the welding process is complicated during the welding process, with low efficiency and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The gas shielded welding wire for steel of this embodiment has the chemical composition and content of the deposited metal (mass fraction%):

[0047] C: 0.15%;

[0048] Mn: 4.0%;

[0049] Si: 0.30%;

[0050] Ni: 13%;

[0051] Mo: 4.0%;

[0052] Ti: 0.10%;

[0053] Cr: 10%;

[0054] S and P are impurity elements, which enter the deposited metal during smelting of raw materials, and the content control range: S<0.005%; P<0.015%;

[0055] The balance is Fe.

[0056] The manufacturing process of this embodiment is: carry out vacuum smelting according to the proportion of alloy elements and pure iron. During smelting, after the pure iron, Cr, Ni, and Mo are melted in a vacuum state, Ti and Si are added in sequence, and an inert gas is used when adding Mn. Protects against evaporation. After all the alloy elements are melted for 30 minutes, it is cast into an ingot, and then the finished welding wire is made by forging, rolling, coiling and wire drawing. The diameter ...

Embodiment 2

[0059]The gas shielded welding wire for steel of this embodiment has the chemical composition and content of the deposited metal (mass fraction%):

[0060] C: 0.18%;

[0061] Mn: 5.0%;

[0062] Si: 0.40%;

[0063] Ni: 14%;

[0064] Mo: 4.5%;

[0065] Ti: 0.15%;

[0066] Cr: 13%;

[0067] S and P are impurity elements, which enter the deposited metal during smelting of raw materials, and the content control range: S<0.005%; P<0.015%;

[0068] The balance is Fe.

[0069] The manufacturing process of this embodiment is the same as that of Embodiment 1. The welding and performance testing process of the welding wire deposited metal test plate is the same as that of Embodiment 1. The properties of the deposited metal after welding are shown in Table 1. .

Embodiment 3

[0071] The gas shielded welding wire for steel of this embodiment has the chemical composition and content of the deposited metal (mass fraction%):

[0072] C: 0.21%;

[0073] Mn: 6.0%;

[0074] Si: 0.50%;

[0075] Ni: 15%;

[0076] Mo: 5.0%;

[0077] Ti: 0.20%;

[0078] Cr: 16%;

[0079] S and P are impurity elements, which enter the deposited metal during smelting of raw materials, and the content control range: S<0.005%; P<0.015%;

[0080] The balance is Fe.

[0081] The manufacturing process of this embodiment is the same as that of Embodiment 1. The welding and performance testing process of the welding wire deposited metal test plate is the same as that of Embodiment 1. The properties of the deposited metal after welding are shown in Table 1.

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Abstract

The invention discloses a gas protection welding wire for low-magnetic steel, and belongs to the field of welding materials. The welding wire comprises components including, by mass percent, 0.15% to 0.35% of C, 4% to 10% of Mn, 0.30% to 1.0% of Si, 13% to 20% of Ni, 3% to 7% of Mo, 0.1% to 0.4% of Ti, 10% to 26% of Cr, smaller than 0.005% of S, smaller than 0.015% of P and the balance Fe. When the disclosed welding wire is used for argon tungsten-arc welding or metal inert gas protection welding of the low-magnetic steel, an obtained welding line has the good mechanical property, the low magnetic conductivity can be ensured, and the welding wire is particularly suitable for welding of working welding lines, with the requirement for the service environment without magnetism or with the low magnetism, of manganese aluminum low magnetic steel.

Description

technical field [0001] The invention belongs to welding materials in the technical field of welding, in particular to a gas-shielded welding wire for manganese-aluminum low magnetic steel. Background technique [0002] Manganese-aluminum single-phase austenitic low-magnetic steel includes 917 steel, 45Mnl7A13 steel, 20Mn23Al steel and other steel types. This type of steel has simple composition, low price, and low relative magnetic permeability. It is widely used in shipbuilding, special vehicles, and degaussing. Structures or components with low magnetic permeability such as stations, military equipment, and transformer cores. In the application process, the welded joints of such structures or components or the relative magnetic permeability of the weld metal is low, which is the key to the entire structure. [0003] According to the retrieval of prior art documents, document [1] discloses a welding method of 917 low magnetic steel + CCSB steel dissimilar steel (applicatio...

Claims

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Application Information

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IPC IPC(8): B23K35/30
CPCB23K35/3086
Inventor 薛小怀金余旭吕雅诗袁璐姚萱
Owner SHANGHAI JIAO TONG UNIV
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