Method for testing mechanical property of braze welding connector

A technology of brazing joints and testing methods, applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of lack of testing methods for mechanical properties of brazed plate-fin structures, inaccurate test results, etc. Reliable test results, simple and clear results

Inactive Publication Date: 2014-12-03
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to address the above problems and propose a method for testing the mechanical properties of brazed joints. On the basis of preparing tensile samples, design corresponding fixtures and apply electronic universal tests with heating furnaces, temperature control systems and data acquisition systems. The mechanical test system measures and records the load-displacement curve, and integrates it to obtain the total energy consumption. The maximum load at the time of...

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  • Method for testing mechanical property of braze welding connector
  • Method for testing mechanical property of braze welding connector
  • Method for testing mechanical property of braze welding connector

Examples

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Embodiment 1

[0062] see figure 1 . A method for testing the mechanical properties of a brazed joint, comprising the following steps:

[0063] (1) Preparation of T-shaped tensile specimen 8

[0064] Adopting the base material of metal materials including carbon steel, aluminum alloy, copper alloy and titanium alloy with a thickness of h=0.9mm, cutting the base material into profiles with a length of 150 mm and a width of 160 mm, and bending them at 90°, Bending the 150mm short side of the profile into an L-shaped structure that is 105mm long and 45mm short.

[0065] Then align the two L-shaped structural parts at the level of 45mm on the short side (back to back), and place a high-temperature resistant nickel-based solder BNi in the middle 2 , Nickel-based solder BNi 2 The thickness is h c =70μm; then brazed with a clamp to obtain a T-shaped welded piece.

[0066] During the implementation, it was found that when the bending angle of the base metal is greater than 90°, the tightness o...

Embodiment 2

[0089] A method for testing the mechanical properties of a brazed joint, the basic content of which is the same as that of Embodiment 1.

[0090] The difference between embodiment 2 and embodiment 1 is:

[0091] The loading rate for testing the mechanical properties of the T-shaped tensile specimen 8 joint at room temperature is 2mm / min, and the preload is 200N.

[0092] The load-displacement curve figure of embodiment 2 test is referring to Figure 4 .

Embodiment 3

[0094] A method for testing the mechanical properties of a brazed joint, the basic content of which is the same as in Example 1.

[0095] The difference between embodiment 3 and embodiment 1 is:

[0096] Austenitic stainless steel with thickness h=0.5mm; nickel-based brazing material BNi 2 The thickness is h c =40μm.

[0097] T-shaped tensile test specimen 8 Welding section 1 has a length of 30mm and a width of 15mm; tensile section 2 has a length of 60mm and a width of 15mm; clamping end 3 has a width of 25mm and a length of 30mm, and the pin on the clamping end 3 The hole 4 has a diameter of 6mm.

[0098] The testing temperature of the heating furnace 9 is 200° C.; the holding time of the testing temperature is 10 minutes.

[0099] The loading rate is 3mm / min and the preload is 200N.

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Abstract

The invention relates to a method for testing a mechanical property of a braze welding connector. The method comprises the following steps: (1) preparing a T-shaped tensile sample; (2) preparing test equipment including an electronic universal testing machine, a clamp, a heating furnace, a temperature control system and a control system; (3) installing the T-shaped tensile sample; (4) testing the mechanical property of a T-shaped tensile sample connector in an environment of the room temperature; (5) testing the mechanical property of the T-shaped tensile sample connector in a high-temperature environment; (6) representing the mechanical property of the connector: integrating a load-displacement curve, dividing the area of a fractured surface to obtain fracture total energy, calculating interface fracture energy (refer to the specification) and a maximal load (refer to the specification) when in fracturing, wherein the interface fracture energy and the maximal load are main parameters representing the mechanical property of the tensile sample. The T-shaped connector sample conforming to the real structure stress situation is provided; the problem that the method for testing the mechanical property of the braze soldering plate-fin structure is in lack and the rest result is incorrect can be solved; the test method is simple, data can be automatically acquired, error in manual operation can be avoided, more efficiency in test can be achieved, and the test result is more accurate.

Description

technical field [0001] The invention belongs to the technical field of plate-fin structure brazing process manufacturing mechanics, and in particular relates to a sample design and testing method for testing the mechanical properties of brazing joints. Background technique [0002] The stainless steel plate-fin heat exchanger has the characteristics of compact structure, high heat exchange efficiency, high temperature resistance and corrosion resistance. At present, heat exchange technology is changing from large-scale to compact and miniaturized. Due to its high-efficiency and compact features, heat exchangers with plate-fin structures are becoming more and more popular in integrated high-temperature systems, and are widely used in nuclear power, Petroleum, chemical industry, aerospace, metallurgy, transportation and other fields. In the new generation of high-temperature gas-cooled reactors, the plate-fin structure is not only the most feasible form of heat exchange unit,...

Claims

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Application Information

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IPC IPC(8): G01N3/18
Inventor 周帼彦舒双文陈兴涂善东王琼琦
Owner EAST CHINA UNIV OF SCI & TECH
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