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A method for improving the strength of brazed welds based on ultrasonic fine-grain treatment of thin-layer melts in narrow gaps

A technology of weld strength and inner thin layer, applied in the field of material welding, can solve the problems of low strength of brazing weld metal, coarsening of weld metal grains, long brazing cycle, etc., to avoid dissolution and corrosion, welding The effect of obvious refinement of seam metal and uniform composition

Active Publication Date: 2020-06-09
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The present invention aims to solve the problem that the existing conventional brazing connection method causes coarsening of weld metal grains and uneven structure due to long brazing cycle and high brazing temperature, which leads to low strength of brazing weld metal, and the brazing seam metal becomes the entire brazing joint. The weak link of the joint leads to the problem of low joint strength, and a method for improving the strength of the brazed weld based on the ultrasonic fine-graining treatment of the thin layer of melt in the narrow gap is provided

Method used

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  • A method for improving the strength of brazed welds based on ultrasonic fine-grain treatment of thin-layer melts in narrow gaps
  • A method for improving the strength of brazed welds based on ultrasonic fine-grain treatment of thin-layer melts in narrow gaps
  • A method for improving the strength of brazed welds based on ultrasonic fine-grain treatment of thin-layer melts in narrow gaps

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specific Embodiment approach 1

[0030]Specific Embodiment 1: In this embodiment, a method for improving the strength of a brazing weld based on ultrasonic fine-graining treatment of a thin layer of melt in a narrow gap is specifically implemented through the following steps:

[0031] 1. Assemble the base metal and solder into the parts to be welded, and adjust the lap gap of the base metal to 0.05-2mm;

[0032] 2. Control the ultrasonic frequency to 20-100kHz, the amplitude to 1-50μm, and the brazing temperature to 220-720°C, and conduct ultrasonic brazing for 1-60s on the part to be welded to complete the preliminary brazing;

[0033] 3. Adjust the brazing temperature to 180-550°C, keep it for 5-20 minutes, then control the ultrasonic frequency to 20-100kHz and the amplitude to 1-50μm, apply ultrasonic vibration to the brazing part, the ultrasonic vibration time is 1s-10min, and then Cooling in the furnace or air cooling to room temperature completes the method for improving the strength of the brazed seam ...

specific Embodiment approach 2

[0035] Embodiment 2: This embodiment differs from Embodiment 1 in that: in step 1, the brazing filler metal is an aluminum-based alloy, a zinc-based alloy or a tin-based alloy. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0036] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: in step 1, the gap between base metals is 0.1 mm. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a method for improving strength of soldered seams on the basis of thin-melt ultrasonic fine crystallization treatment in narrow gaps, and relates to the technical field of material welding. The invention aims at solving the problems that for an existing soldering connection method, due to the fact that the welding cycle is long and the welding temperature is high, soldered seam metal is large in crystal size and nonuniform in texture, and the soldered seams are low in strength. The method comprises the steps that 1, soldering materials and parent metal are assembled into a to-be-soldered part, and parent metal lapping gaps are adjusted and controlled; 2, preliminary soldering is conducted; and 3, thin-melt ultrasonic fine crystallization treatment is conducted. After soldering is conducted through the method, the crystal size of the soldered seams is obviously refined, and toughness of the soldered seams is greatly improved. According to the method, the technology is simple, the operation cost is low, fine crystal strengthening of the soldered seams of aluminum-alloy, copper-alloy, magnesium-alloy and aluminum-matrix composite materials and ceramic and ceramic-matrix composite materials can be achieved, and the method can be used for the engineering application field of complex structural components.

Description

technical field [0001] The invention relates to the technical field of material welding. Background technique [0002] Aluminum alloys, copper alloys, magnesium alloys, titanium alloys, aluminum matrix composites, ceramics and ceramic matrix composites have been widely used in the fields of national defense, aerospace, machinery, chemical industry and electronics. focus of researchers' attention. Brazing is a commonly used material joining method at present. During the brazing connection, in order to promote the diffusion, dissolution and chemical reaction between the base metal and the liquid solder near the brazing interface, generally speaking, the welding cycle is long and the welding temperature is high, which will cause the brazing weld metal grains to be coarse. The problem of low strength of the brazed weld caused by chemicalization and uneven structure. [0003] In order to refine the brazing seam metal and improve the strength of the brazing seam, Chinese patent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/06B23K3/08
CPCB23K1/06B23K3/08
Inventor 闫久春吴炳智
Owner HARBIN INST OF TECH
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