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Test piece, middleware, pre-welding test piece and preparation method thereof

A technology of middleware and test piece, which is applied in the field of laser welding, can solve the problems of inaccurate effective weld length, wasting test pieces, and affecting the accuracy of shear tensile test results, etc., so as to reduce the risk of off-cutting and reduce the relative Length, the effect of reducing the risk of off-cutting

Active Publication Date: 2020-07-03
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventors found that the problem of the first solution is: since there is no cutting mark on the test piece and the length of both sides is long, the process of cutting the weld along the length direction of both sides of the test piece is time-consuming and prone to off-cutting. Furthermore, it is impossible to obtain a complete shear tensile standard specimen, which affects the test accuracy of the shear tensile specimen; even when the degree of shear deviation is large, the shear tensile requirements cannot be met, and the daily laser welding test must be re-prepared. required test pieces, thus greatly reducing the preparation efficiency of test pieces required for daily laser welding pre-welding tests
However, the inventors found that the problem of the second scheme is: the length of the effective weld is usually inaccurate, which seriously affects the accuracy of the shear tensile test results, and this scheme needs to consume four test pieces each time, wasting a lot of test pieces

Method used

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  • Test piece, middleware, pre-welding test piece and preparation method thereof
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  • Test piece, middleware, pre-welding test piece and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Such as image 3 As shown, the test piece of this embodiment includes a sheet-like main body 1 , a first extension piece 2 and a second extension piece 3 . Wherein, the first extension piece 2 and the second extension piece 3 are formed by extending outwards along both sides of the sheet-shaped main body 1 , and are arranged in one-to-one correspondence and facing each other to form a pair of extension pieces. In this embodiment, the sheet body 1 forms a T-shaped structure with the first extension piece 2 and the second extension piece 3 .

[0062] In this embodiment, the working area on the sheet body does not cover the entire area of ​​the sheet body. The outermost boundary of the working area of ​​the extension sheet pair is the farthest boundary of the two endpoints of the prepared laser weld.

[0063] The test piece of this embodiment has a T-shaped structure as a whole, which reduces the relative length of cutting, can reduce the risk of cutting deviation in the...

Embodiment 2

[0070] In this embodiment, on the basis of the first embodiment, a first groove is provided at the boundary line between the first extension piece and the sheet-shaped main body. It should be noted that the number of the first grooves is 1 or 2. Such as Figure 5 As shown, two first grooves 4 are provided at the boundary line between the first extension piece 2 and the sheet-shaped main body 1 .

[0071] In this embodiment, the first groove is shaped by cutting a stainless steel sheet without a groove structure.

[0072] It can be understood that those skilled in the art can also use other methods to obtain the first groove, for example: the first groove is a prefabricated groove, which can be formed by pouring preset stainless steel materials by using a mold with a groove structure .

[0073] In this embodiment, a groove structure is provided on the test piece to play the role of cutting and positioning, which is beneficial to the cutting of the test piece after welding. ...

Embodiment 3

[0075] In this embodiment, on the basis of the first embodiment, a second groove is provided at the boundary line between the second extension piece and the sheet-shaped main body. It should be noted that the number of second grooves is 1 or 2. Such as Image 6 As shown, two second grooves 5 are provided at the boundary line between the second extension piece 3 and the sheet-like main body 1 .

[0076] In this embodiment, the second groove is shaped by cutting a stainless steel sheet without a groove structure.

[0077] It can be understood that those skilled in the art can also use other methods to obtain the second groove, for example: the second groove is a prefabricated groove, which can be formed by pouring preset stainless steel materials by using a mold with a groove structure .

[0078] In this embodiment, a groove structure is provided on the test piece to play the role of cutting and positioning, which is beneficial to the cutting of the test piece after welding. ...

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Abstract

The invention belongs to the field of laser welding, and provides a test piece, a middleware, a pre-welding test piece and a preparation method thereof. In order to solve the problems that the cuttingamount is large, cutting deviation is likely to happen, and a complete shear test piece cannot be obtained in the process of preparing a shear tensile test piece, the invention provides a test piecewhich comprises a sheet-shaped main body, wherein the sheet-shaped main body extends outwards towards one side to form at least one first extension sheet; the sheet-shaped main body extends outwards towards the other side to form at least one second extension sheet; at least one first extension sheet and the other second extension sheet are in one-to-one correspondence and are oppositely arrangedto form an extension sheet pair; and the extension sheet pair and the sheet-shaped main body are respectively provided with a working area for preparing a laser welding seam. The cutting length is shortened, the risk of cutting deviation in the process of preparing the shear tensile test piece is reduced, and the integrity of the shear tensile test piece and the preparation efficiency of the testpiece are improved.

Description

technical field [0001] The invention belongs to the field of laser welding, in particular to a test piece, an intermediate piece, a pre-weld test piece and a preparation method thereof. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The laser welding of rail vehicle laser welding stainless steel side walls adopts the form of non-full penetration lap joints. Daily pre-weld tests must be carried out before starting work. The daily tests of each laser welded lap joint include a set of macroscopic metallographic tests and a set of shear tests. Stretching test. Among them, metallographic test refers to a test method, the purpose of which is to correlate the physical and mechanical properties of metal materials with their internal structures. item performance. Shear tensile testing refers to a method for testing longitudinal and transverse s...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N3/02G01N3/08
CPCG01N1/28G01N3/02G01N3/08
Inventor 刘桐李兴帅马爱华王福全赵延强
Owner CRRC QINGDAO SIFANG CO LTD