Novel welding repair CTOD (crack tip opening displacement) experimental method

An experimental method and rework technology, applied in the field of welding, can solve the problems of invalid CTOD samples, welding test plate extension test costs, invalid samples, etc., and achieve the goal of improving the preparation success rate, increasing the preparation success rate, and low cost Effect

Active Publication Date: 2015-12-02
PENGLAI JUTAL OFFSHORE ENG HEAVY IND CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

At this stage, V-shaped grooves are generally used for CTOD experiments, and surface notch samples are used. The CTOD performance of the center of the weld is fashionable, but for the CTOD performance of the heat-affected zone of the reworked weld, due to the DNV-OS - According to the relevant regulations of the C401 standard, it is necessary to ensure that the distance between the notch position and the weld fusion line does not exceed 0.5mm. Very high requirements, prone to invalid CTOD samples
And usually, when welding is repaired, one side of the repaired seam will be the original weld seam, and the other side will be the base me...

Method used

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  • Novel welding repair CTOD (crack tip opening displacement) experimental method
  • Novel welding repair CTOD (crack tip opening displacement) experimental method
  • Novel welding repair CTOD (crack tip opening displacement) experimental method

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Embodiment

[0035] Such as Figure 1 to Figure 6 Shown, a kind of new welding repair CTOD experiment method provided by the present invention, specific implementation process is as follows: 1. Blanking

[0036] According to the material certificate of the steel plate, go to the material factory to find the corresponding steel plate, that is, the base material 1, and cut and process the test plate according to the processing drawing, two pairs of "X" type groove test plates, and two pairs of "K" type groove test plates.

[0037] 2. Train welders.

[0038] In order to ensure that the fusion line on the straight side of the "K" groove can be in the same plane as possible, it is necessary to train welders on skills and operating points. The parameters of the process are carefully adjusted and recorded.

[0039]

[0040] Table 1 Typical welding parameters of submerged arc welding

[0041]

[0042] Table 2 Typical welding parameters of carbon dioxide gas shielded welding (rework)

[0...

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Abstract

The invention discloses a novel welding repair CTOD (crack tip opening displacement) experimental method. The experimental method is characterized in that X and K type prefabricated weld grooves are adopted for welding of a prefabricated weld seam; a K type repair weld groove is adopted for the CTOD experiment of a welding heat affected zone; X and V type repair weld grooves are adopted for the CTOD experiment of a weld zone, the advantages of the two are combined, therefore the CTOD fracture toughness value of the most fragile part of a connector can be accurately evaluated, and the performance of a welded joint can be ensured. According to the novel welding repair CTOD (crack tip opening displacement) experimental method, provided by the invention, the form scope of a prefabricated weld groove is enlarged, the success rate of preparation of an effective CTOD sample for a welding heat affected zone can be increased, the application range is wider and the cost is lower.

Description

technical field [0001] The invention relates to the technical field of welding, in particular to a new CTOD experimental method for welding repair. Background technique [0002] CTOD is the acronym for the English name CrackTipOpeningDisplacement, which is called crack tip opening displacement in Chinese, which refers to the relative distance between the two surfaces after the crack tip is subjected to an opening load, often expressed in δ, and the common unit is mm. Sampling for the crack tip opening displacement test, according to the international general standard BS7448, can make samples according to the actual thickness (that is, full-thickness samples). In this way, the size effect of the original structure (plate thickness) is preserved, and the actual welding conditions are well simulated, so the measured toughness will be more accurate and reliable. The value of CTOD reflects the ability of the crack tip material to resist cracking, that is, the toughness of the ma...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N3/00
Inventor 程尚华张同乐王世达贾晓燕王旭宋顺
Owner PENGLAI JUTAL OFFSHORE ENG HEAVY IND CO LTD
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