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Light beam-electron beam composite brazing method for high-nitrogen steel

A technology of electron beam and high-nitrogen steel, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of reducing the comprehensive performance of welding joints, weakening material performance, and large deformation of welding surface, etc., to overcome air holes Disadvantages, weakened grain growth, and good welding quality

Active Publication Date: 2019-01-04
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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Problems solved by technology

At present, high-nitrogen steel welding technology is mainly based on friction welding, friction stir welding, TIG welding, MIG welding, explosive welding, gas shielded welding, laser and its hybrid welding. The nitrogen content of the steel itself is high, and the welding porosity problem caused by the nitrogen precipitation of the base metal often occurs during the welding process, which in turn induces the appearance of other hard and brittle phases, weakens the properties of the material, and reduces the overall performance of the welded joint
[0003] The Chinese patent "Laser MIG Arc Hybrid Welding Method for High Nitrogen Steel" (application number 201210385839.2) provides a method for brazing high nitrogen steel using laser-MIG arc hybrid welding technology; Joint Strength Welding Device and Its Welding Method" (ZL201610363272.7) provides a new idea of ​​improved laser-arc hybrid welding of high nitrogen steel, and simultaneously solves the welding porosity of high nitrogen steel through the method of magnetic control and temperature control and poor toughness of welding heat-affected zone
However, the above composite welding method is not suitable for self-made high nitrogen steel 1Cr26Mn22N (by 0.9-2.1 parts N, 51-65 parts Fe, 1.9-2.7 parts Ni, 23-28 parts Cr, 19-25 parts Mn, 1.2-1.6 parts Mo , 0.2-0.6 parts of C, 0.02-0.05 parts of S, 0.05-0.08 parts of P and 0.5-0.8 parts of Si (by weight), there are still problems of base metal melting, nitrogen loss and weld width during welding In addition, due to the melting of the base metal and the loss of nitrogen elements, the welding surface is deformed greatly

Method used

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Experimental program
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Effect test

Embodiment 1

[0031] For 0.9 parts of N, 65 parts of Fe, 1.9 parts of Ni, 23 parts of Cr, 19 parts of Mn, 1.2 parts of Mo, 0.2 parts of C, 0.02 parts of S, 0.05 parts of P and 0.5 parts of Si (by weight) The steel is brazed, and first prepared is composed of 25 parts of Pd, 46 parts of Ni, 36 parts of Cr, 2.8 parts of vanadium-nickel-coated graphene, 12 parts of Mn, 7 parts of Re, 6 parts of Si and 2 parts of B (by weight). The brazing paste, the specific preparation method of this solder paste is as follows:

[0032] The first step, utilize FAD5001 electronic balance, weigh 15g distilled water, 15g water-based binder, molar concentration be 15.97mol / L alcohol 6g and 5g acetone, above-mentioned water-based binder is made of zinc phosphate 36 weight parts, chlorinated 45 parts by weight of ammonium, 15 parts by weight of polyethylene glycol, 14 parts by weight of butyl cyanoacrylate, and 11 parts by weight of ammonium persulfate; meanwhile, configure Pd, Ni, Cr, vanadium-nickel graphene, Mn,...

Embodiment 2

[0043] For 2.1 parts of N, 51 parts of Fe, 2.7 parts of Ni, 28 parts of Cr, 25 parts of Mn, 1.6 parts of Mo, 0.6 parts of C, 0.05 parts of S, 0.08 parts of P and 0.8 parts of Si (by weight) The steel is brazed, first prepared by 28 parts of Pd, 39 parts of Ni, 39 parts of Cr, 5.8 parts of vanadium-nickel-coated graphene, 15 parts of Mn, 11 parts of Re, 9 parts of Si and 5.5 parts of B (by weight). The brazing paste, the specific preparation method of this solder paste is as follows:

[0044] The first step, utilize FAD5001 electronic balance, weigh 30g distilled water, 30g water-based binder, 13g molar concentration be the alcohol of 15.97mol / L and 12g acetone, above-mentioned water-based binder is made of 24 parts by weight of zinc phosphate, chlorine 61 parts by weight of ammonium chloride, 23 parts by weight of polyethylene glycol, 22 parts by weight of butyl cyanoacrylate, and 7 parts by weight of ammonium persulfate; meanwhile, configure Pd, Ni, Cr, vanadium-plated nickel...

Embodiment 3

[0054] For 1.5 parts of N, 58 parts of Fe, 2.3 parts of Ni, 25.5 parts of Cr, 22 parts of Mn, 1.4 parts of Mo, 0.4 parts of C, 0.035 parts of S, 0.065 parts of P and 0.65 parts of Si (by weight) The steel is brazed, first prepared by 26.5 parts of Pd, 42.5 parts of Ni, 37.5 parts of Cr, 4.3 parts of vanadium-nickel-coated graphene, 13.5 parts of Mn, 9 parts of Re, 7.5 parts of Si and 3.75 parts of B (by weight). The brazing paste, the specific preparation method of this solder paste is as follows:

[0055] The first step, utilizes FAD5001 electronic balance, weighs 22.5g distilled water, 22.5g water-based binder, 10.5g molar concentration is the alcohol of 15.97mol / L and 8.5g acetone, and above-mentioned water-based binder is made of zinc phosphate 30 weight parts, 53 parts by weight of ammonium chloride, 19 parts by weight of polyethylene glycol, 18 parts by weight of butyl cyanoacrylate, and 8 parts by weight of ammonium persulfate; meanwhile, configure Pd, Ni, Cr, vanadium-...

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Abstract

The invention discloses a light beam-electron beam composite brazing method for high-nitrogen steel. The method comprises the following steps that firstly, solder paste is prepared and applied to a to-be-welded surface of a welded part; secondly, the two ends and the center of the welded surface are subjected to optical radiation heating welding through xenon arc lamp light beam welding; thirdly,a side A of the to-be-welded surface is brazed through electron beam defocusing welding, and the welding parameters are set as follows: the vacuum degree is (2.5-5) x 10-8MPa, the electron beam current is 25-45mA, the partial beam amount of the electron beam current is 1.2-3.6mm, the welding speed is 8.5-11.5dm / min, the acceleration voltage is 45-65kV, and the focusing current is 2350-2760mA; andfourthly, a side B of the to-be-welded surface is brazed through electron beam focusing welding, and the welding parameters are set as follows: the electron beam current is 25-33mA, the partial beam amount of the electron beam current is 0.01-0.55mm, the welding speed is 3.5-7.5dm / min, the acceleration voltage is 45-65kV, and the focusing current is 2180-2250mA. During welding, high-nitrogen steelbase metal is not melted, nitrogen elements are not lost, pores are not prone to being formed, the welding heat affected zone and residual stress are reduced, and the mechanical properties of a brazed connector are enhanced.

Description

technical field [0001] The invention relates to the technical field of high-nitrogen steel welding, in particular to a method for beam-electron beam composite brazing high-nitrogen steel. Background technique [0002] High-nitrogen steel has the advantages of corrosion resistance, oxidation resistance, wear resistance and excellent mechanical properties. It is one of the important materials for the manufacture of aviation, ships and weapons. The welding technology of high-nitrogen steel is an important process that determines its application scope. links. At present, high-nitrogen steel welding technology is mainly based on friction welding, friction stir welding, TIG welding, MIG welding, explosive welding, gas shielded welding, laser and its hybrid welding. The nitrogen content of the steel itself is high, and the welding porosity problem caused by the nitrogen precipitation of the base metal often occurs during the welding process, which in turn induces the appearance of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K35/40
CPCB23K1/0056B23K35/40
Inventor 王星星李帅何鹏彭进龙伟民王世清倪增磊
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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