Fabrication and detection methods of weld defects in common materials for pressure equipment in natural gas stations

Abstract

The present invention discloses a natural gas terminal station pressure equipment general material weld line defect making and detection method which comprises the following steps: 1) selecting a plurality of test plates, and in turn performing groove preparation, test plate fitting-up, basic welding, defect production, filling welding, surface treatment and signage installation on the test plates to obtain defective test blocks, wherein the defect production includes outer surface crack defect production, inner surface crack defect production, test block surface and interlayer unfused defect production, root part and double-sided non-through-welding defect production, air hole defect production and test block slag defect production; and 2) using an ultrasonic flaw detection test device for detecting the defective test blocks, acquiring detection signals corresponding to a variety of defects, and establishing congruent relationship of the variety of defects and the detection signals. The natural gas terminal station pressure equipment general material weld line defect making and detection method can achieve natural gas terminal station pressure equipment general material weld line defect making and detection.

Description

technical field [0001] The invention belongs to the field of mechanical defect detection, and relates to a method for manufacturing and detecting weld seam defects of commonly used materials for pressure equipment in natural gas stations. Background technique [0002] With the "accelerated" growth of the demand for natural gas due to the development of the national economy, since the beginning of this century, my country has successively built a number of high-pressure natural gas pipeline systems such as the first, second and third lines of the West-East Gas Pipeline, the second and third lines of the Shaanxi-Beijing Gas Pipeline, and the Central Asia pipeline. As a key link in the entire pipeline system, the natural gas station has the functions of natural gas storage and distribution, scheduling and diversion, and process treatment. At the same time, the station is a place for natural gas input and output, which gathers huge energy. Major dangerous accidents in natural g...

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Problems solved by technology

[0006] Aiming at the on-site problems of ultrasonic testing of station pressure equipment, a survey of commonly used materials for station pressure equipment was carried out, and pre-embedded defect simulation comparison test blocks and probes were prepared for weld defects of commonly used materials, and pre-embedded defect verification and ultrasonic signal identification were completed Analysis, research and field application have formed a systematic quantitative detection method for weld defects of commonly used materials for station pressure equipment to improve the accuracy and reliability of on-site detection and ensure the safe operation of station pressure equipment. However, there is no such technology in the prior art literature and information

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