Measuring device and method for weld strength

A technology of weld strength and measuring device, which is applied in the direction of measuring device, strength characteristics, and the use of stable tension/pressure test material strength, etc., can solve the problem of inability to measure the strength of welded joints, and achieve the convenience and convenience of measurement Fast fixation, the effect of improving accuracy

Active Publication Date: 2019-03-29
YINBANG CLAD MATERIAL
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  • Description
  • Claims
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Problems solved by technology

due to L f b , as the tensile force F increases, the fins preferentially reach the tensile strength σ f Fracture occurs, unable to measure weld joint strength

Method used

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  • Measuring device and method for weld strength
  • Measuring device and method for weld strength
  • Measuring device and method for weld strength

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Experimental program
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Embodiment

[0074] First, prepare the corresponding ratio of E-7 adhesive 42 according to the test requirements. A sample is cut from the brazed material containing the fins 43 and the base plate 45 by using the electric spark cutting method, and a compact 41 similar to the structure formed by the two fins 43 in the sample is made or selected for use. The size of the sample after the cutting is: the length of the substrate is 30mm, the width is 10mm (that is, the length of the weld is 10mm), the width of the weld is 1.2mm, and the area of ​​the weld is 1.2*10=12mm 2 The fin 43 is located at the middle position of the base plate 45, and the length of the clampable part of the fin 43 is 30 mm. Grinding treatment is performed on each surface to be pasted of the sample and the pressing block 41. The surface to be adhered of the pressing block 41 is bonded between the two sides of the fin 43 of the sample through an adhesive 42.

[0075] Place the well-bonded sample in a furnace, and heat up to ...

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Abstract

The invention provides a measuring device and a measuring method for welding seam strength. The measuring device comprises a fin slot and a substrate slot, wherein the fin slot is a square structure; the side surface of the fin slot is provided with a wedge-shaped slot; the width of the upper end of the wedge-shaped slot is smaller than that of the upper end of the fin slot; the wedge-shaped slot is used for fixing a fin of a sample; the substrate slot is a square structure; and the side surface of the substrate slot is provided with a T-shaped slot which is used for fixedly mounting a substrate of the tested sample. According to the measuring device and the measuring method for the welding seam strength, a welding seam is fractured before a fin in a test sample tensile test process; meanwhile, the device can be used for clamping fins at the two sides, and can apply tensile force in a direction perpendicular to the plate surface of a composite plate, so that an inclination problem is avoided, the tensile strength value of a braze-welding welding seam can be measured more accurately, and the measuring accuracy is improved.

Description

Technical field [0001] The invention mainly relates to the technical field of metal welding, in particular to a measuring device and a measuring method for the brazing seam strength of fins and substrates. Background technique [0002] Plate-fin heat exchangers are widely used in automotive heat dissipation systems, and they have many advantages such as high heat dissipation efficiency, simple structure, and light weight. In the power station air cooling system, the plate-fin heat exchanger can also play a role in saving water resources and protecting the environment. [0003] Plate-fin heat exchangers mainly use brazing technology to weld the fins on an aluminum / aluminum (or aluminum / steel) composite substrate to form a metallurgical joint weld. At present, the evaluation of this type of brazed weld is mainly focused on the use of shear strength test method or metallographic observation method. Shear test requires high sample processing accuracy, requires high flatness, and fin m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/02
CPCG01N3/02G01N3/08G01N2203/0296
Inventor 孙畅李龙周德敬
Owner YINBANG CLAD MATERIAL
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