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Impact energy test of metallic weld seam and calculation method

A technology of impact energy and impact sample, which is applied in the field of metal weld impact energy test and calculation, can solve the problems of high test cost, cumbersome process, irregular sample notch processing, etc., to reduce test cost and save test materials , reduce the effect of repeated experiments

Active Publication Date: 2012-09-05
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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Problems solved by technology

The impact test at room temperature generally adopts the national standard GB / T229-1994 "Metal Charpy Impact Test Method"; according to the notch shape of the sample, it can be divided into two types of impact tests: "U" notch and "V" notch , in the prior art, the calculation of the impact energy value at the metal weld requires an impact test on the metal weld each time. This method has a large test cost and a cumbersome process. Toughness results produce relatively large errors

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  • Impact energy test of metallic weld seam and calculation method
  • Impact energy test of metallic weld seam and calculation method
  • Impact energy test of metallic weld seam and calculation method

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Embodiment Construction

[0035] The present invention will be further described below according to specific embodiments,

[0036] 1. Take P92 steel weld impact samples numbered 1-8, conduct macroscopic metallographic observation on both sides, and calculate the fine grain ratio f according to formula (1) n , as shown in Table 2 after calculation.

[0037] f n = Σ ( S i ) L × 100 % Formula 1)

[0038] Among them, S i is the length of the i-th fine grain at the side of the P92 steel weld, in mm; L is the length of the side of the P92 weld, in mm;

[0039] 2. Conduct an impact test on the P92 steel parent materials numbered A, B and C. The test steps are:

[0040] Take three 55mmx10mmx10mm P92 steel base materials numbered A, B and C and eight 55mmx10mmx10mm P92 st...

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Abstract

The invention relates to an impact energy test of a metallic weld seam and a calculation method. The calculation method comprises the following steps: 1. calculating the fine grain proportion of an impact specimen of the metallic weld seam; 2. carrying out the impact test on parent metal and the metallic weld seam; 3. calculating the impact energy and the proportional constant k of the parent metal and the metallic weld seam; and 4. calculating the impact energy of the target metallic weld seam according to the formula (4) e=f*k*E to obtain the impact energy e of the target metallic weld seam. The invention can reduce trivial repeatability tests, save a large quantity of test materials and lower the test cost.

Description

technical field [0001] The invention relates to a metal welding seam impact energy test and calculation method. Background technique [0002] The impact toughness of metal materials is generally obtained by means of standard impact tests to obtain impact energy. The impact test is to process the metal material into a sample of a certain shape. The sample is impacted and fractured under the impact load. The impact performance of the material is evaluated according to the magnitude of the absorbed energy and the fracture characteristics. The impact test at room temperature generally adopts the national standard GB / T229-1994 "Metal Charpy Impact Test Method"; according to the notch shape of the sample, it can be divided into two types of impact tests: "U" notch and "V" notch , in the prior art, the calculation of the impact energy value at the metal weld requires an impact test on the metal weld each time. This method has a large test cost and a cumbersome process. Toughness ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/303
Inventor 冯砚厅牛晓光李中伟李文彬郑相锋
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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