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Ultrahigh-strength low-temperature welding wire

An ultra-high-strength, low-temperature technology, applied in the direction of welding media, welding equipment, welding/cutting media/materials, etc., can solve the problems of increasing the cost of welding wire, and achieve cold crack resistance, good plasticity, low temperature toughness, and high strength. Effect

Inactive Publication Date: 2016-10-12
KUNSHAN MCC BAOSTEEL WELDING CONSUMABLES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high-strength steel welding materials with a yield strength of 690 MPa, the alloy system used is mainly Mn-Ni-Mo alloy system, in which the Ni content is more than 2.5%, and the Mo content is more than 0.45%. Increase wire cost

Method used

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  • Ultrahigh-strength low-temperature welding wire
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  • Ultrahigh-strength low-temperature welding wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The composition and percentage of welding wire alloy are: C: 0.1%, Mn: 1.4%, Si: 0.4%, Ni: 2.8%, Mo: 0.45%, Cr: 0.4%, microalloy: Ti: 0.045%, Zr: 0.020 %, the rest is iron; the content of non-gold elements is: S: 0.010%, P: 0.015%, N: 70PPm, O: 50PPm.

Embodiment 2

[0027] C: 0.08%, Mn: 1.45%, Si: 0.9%, Ni: 2.8%, Mo: 0.35%, Cr: 0.55%, microalloy: Ti: 0.010%, and the rest is iron; the content of non-gold elements is: S: 0.008%, P: 0.01%, N: 50PPm, O: 40PPm.

Embodiment 3

[0029] C: 0.07%, Mn: 1.55%, Si: 0.6%, Ni: 3.0%, Mo: 0.55%, Cr: 0.60%, microalloying: Zr: 0.015%, and the rest is iron; the content of non-gold elements is: S: 0.010%, P: 0.015%, N: 70PPm, O: 50PPm.

[0030] The above three specific implementation methods are respectively made through the process sequence of welding wire smelting, off-line pickling, welding wire drawing, welding wire copper plating, welding wire layer winding, and adding welding wire annealing process in the welding wire drawing process. The welding cladding metal performance index of the welding wire of the present invention is shown in Table 1, the welding application parameters of the welding wire are shown in Table 2, and the performance parameters after welding are shown in Table 3.

[0031] Table 1

[0032]

[0033] Table 2

[0034]

[0035] table 3

[0036]

[0037] In order to compare the difference in conventional performance between the welding wire designed by the present invention and th...

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Abstract

The invention provides an ultrahigh-strength low-temperature welding wire. The ultrahigh-strength low-temperature welding wire is composed of an alloy system and non-metallic elements. The alloy system adopts a Mn2-Ni3-Cr-Mo system, and the alloy components comprise, by weight percentage, smaller than or equal to 0.10% of C, 1.4%-2.0% of Mn, 0.4%-0.9% of Si, 1.8%-2.1% of Ni, 0.3%-0.5% of Mo, 0.2%-0.6% of Cr, at least one of microalloy Ti and Zr and the balance iron, wherein the content of Ti is smaller than or equal to 0.020%, and the content of Zr is smaller than or equal to 0.020%. The non-metallic elements comprise, by weight percentage, smaller than or equal to 0.010% of S, smaller than or equal to 0.015% of P, smaller than or equal to 70PPm of N and smaller than or equal to 50PPm of O. The welding wire guarantees that deposited metal has high strength and also has good plasticity and low-temperature toughness, and the cold crack resistance of weld metal under a low or proper preheating temperature condition is guaranteed.

Description

technical field [0001] The invention relates to an ultra-high-strength low-temperature welding wire. Background technique [0002] In order to ensure the safety and reliability of high-strength steel welded structures, improve the service life of products, and avoid brittle failure accidents, improving the strength and toughness of weld metal by selecting high-quality welding materials has always been the focus of welding technicians' research work. Focusing on the strengthening and toughening of low-alloy high-strength steel weld metal, welding technicians at home and abroad have conducted a large number of experimental studies. For weld metal with a yield strength of no more than 550MPa, Ti-B microalloying can be used to make the weld metal obtain Uniform and fine acicular ferrite structure, so as to realize the strengthening and toughening of weld metal; and for weld metal with yield strength exceeding 550MPa, due to the increase of weld alloying degree, the matrix struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30
CPCB23K35/3066
Inventor 李好生
Owner KUNSHAN MCC BAOSTEEL WELDING CONSUMABLES