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Welding process for one-time brazing forming of parts with different heat capacities

A welding process and component technology, applied in the field of welding process, can solve the problems of flow, incomplete penetration of solder, melting, etc., to achieve the effect of simple production operation and beautiful welding seam

Pending Publication Date: 2022-03-29
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Different heat capacity components absorb different heat in the vacuum brazing process. If the process is not suitable, it will cause problems such as incomplete penetration or excessive melting and flow of solder.

Method used

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  • Welding process for one-time brazing forming of parts with different heat capacities
  • Welding process for one-time brazing forming of parts with different heat capacities

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A welding process for one-time brazing of parts with different heat capacities, comprising the following steps:

[0045] S1. Surface treatment:

[0046] The welding parts of the thin-walled part 1 and the high heat capacity metal substrate 2 are sequentially polished, pickled and cleaned with metallographic sandpaper to remove surface oil, oxidation and residual metal powder particles; use metallographic sandpaper to remove silver-based solder 3 The oxide layer, and then ultrasonic cleaning, the ultrasonic frequency is 300kHz, the ultrasonic power is 800w, and the ultrasonic cleaning time is 10mim;

[0047] Among them, the material of the thin-walled part 1 is Kovar 4J29; the thin-walled part 1 is a thin-walled tube with a diameter of 50mm;

[0048] The material of the high heat capacity metal substrate 2 is oxygen-free copper TU00;

[0049] The silver-based solder 3 is AgCu28 series welding wire, the composition and content of the silver-based solder 3 are: Cu 26wt%,...

Embodiment 2

[0068] A welding process for one-time brazing of parts with different heat capacities, comprising the following steps:

[0069] S1. Surface treatment:

[0070] The welding parts of the thin-walled part 1 and the high heat capacity metal substrate 2 are sequentially polished, pickled and cleaned with metallographic sandpaper to remove surface oil, oxidation and residual metal powder particles; use metallographic sandpaper to remove silver-based solder 3 The oxide layer, and then ultrasonic cleaning, the ultrasonic frequency is 400kHz, the ultrasonic power is 1500w, and the ultrasonic cleaning time is 25mim;

[0071] Wherein, the material of the thin-walled part 1 is stainless steel; the thin-walled part 1 is a thin-walled tube with a diameter of 100mm;

[0072] The material of the high heat capacity metal base 2 is oxygen-free copper TU0;

[0073] The silver-based solder 3 is AgCu28 series welding wire, and the composition and content of the silver-based solder 3 are: Cu 27wt...

Embodiment 3

[0092] A welding process for one-time brazing of parts with different heat capacities, comprising the following steps:

[0093] S1. Surface treatment:

[0094] The welded parts of the thin-walled part 1 and the high-heat-capacity metal substrate 2 are sequentially polished with metallographic sandpaper, pickled and cleaned to remove surface oil, oxidation and residual metal powder particles, and the thin-walled part 1 is nickel-plated, plated The thickness of the nickel layer is 8 μm; the oxide layer on the silver-based solder 3 is removed with metallographic sandpaper, and then ultrasonic cleaning is performed, the ultrasonic frequency is 200kHz, the ultrasonic power is 400w, and the ultrasonic cleaning time is 5mim;

[0095] Among them, the material of the thin-walled part 1 is Kovar 4J29; the thin-walled part 1 is a thin-walled tube with a diameter of 20 mm;

[0096] The material of the high heat capacity metal substrate 2 is oxygen-free copper TU00;

[0097] The silver-b...

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Abstract

The invention discloses a one-time brazing forming welding process for parts with different heat capacities. The one-time brazing forming welding process comprises the following steps that S1, surface treatment is conducted, specifically, all the parts are cleaned, and welding flux is polished; a welding ring is manufactured according to the size and the shape of the part, spot welding is conducted on the built-in welding ring through a laser spot welding machine, and spot welding of the built-in welding ring is not needed; s3, vacuum brazing is conducted, specifically, the assembled workpiece is placed in a vacuum brazing furnace, the temperature rise gradient is controlled, gradient temperature rise is conducted according to the temperature rise speed of about 5 DEG C / min, 4 DEG C / min, 2-3 DEG C / min and 1 DEG C / min, and the uniform temperature of the part and the welding flux is kept; s4, precision machining; and S5, heat treatment, wherein the workpiece is placed in a vacuum furnace to be subjected to low-temperature heat treatment. The welding process meets the brazing standard, meets the quality design requirement of a welding joint, is feasible, is high in yield, and can meet the welding of special parts.

Description

technical field [0001] The invention relates to the technical field of brazing, in particular to a welding process for one-time brazing forming of parts with different heat capacities. Background technique [0002] In many industries, such as medical CT and nuclear magnetic resonance equipment, there are many structures that use designed copper to weld with other thin-walled tubes to play a role in heat dissipation, and its brazing is difficult. [0003] Kovar, stainless steel, and oxygen-free copper are dissimilar materials with large differences in chemical composition and physical properties. For vacuum brazing, the difference in expansion coefficient is the most important factor, which makes brazing inherently difficult. [0004] Different heat capacity components absorb different heat during vacuum brazing. If the process is not selected properly, it will cause problems such as incomplete penetration or excessive melting and flow of solder. Contents of the invention ...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 王非杨平刘锦慧岳佳伟杨维娟赵永兵
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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