Under-pressure welding method

Abstract

The invention discloses an under-pressure welding method and belongs to the field of equipment leakage treatment. The method includes the steps that whether the thickness of the edge of a leakage point is larger than three mm or not is judged; when the thickness of the edge of the leakage point is larger than three mm, the type of the leakage point is determined according to the shape, size and position of the leakage point, and the types of the leakage point include small holes, cracks, regular holes of a regular part of equipment, irregular holes of the regular part of the equipment and holes of an irregular part of the equipment; and the leakage point is welded and repaired according to the type of the leakage point. According to different types of the leakage point, the leakage point is treated respectively through under-pressure welding modes including direct welding, welding after leaking stoppage through a plugging device, flow guide welding through a flow guide pipe and the like, and the pertinence, operability, generalizability and reliability are quite high.

Description

technical field [0001] The invention relates to the technical field of equipment leakage treatment, in particular to a welding method under pressure. Background technique [0002] In the working process of containers, pipelines, equipment and valves, especially for containers, pipelines, equipment and valves that are used in refining and chemical equipment to carry medium and low pressure non-flammable, explosive, non-toxic and harmful media, due to long-term Operating in high temperature, high pressure, corrosive environment, etc., it is constantly corroded and washed, and its own defects make these containers, pipelines, equipment and valves often leak. In order to ensure production, it is necessary to carry out pressure treatment on the leaking part. [0003] In the prior art, the leakage site can be treated by sealing the reinforcement sleeve or by injecting adhesive tape into the fixture to seal the leakage. Among them, the use of reinforced sleeve sealing is to first...

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Problems solved by technology

[0005] Since the leaking parts are usually irregular in shape, in order to achieve a better sealing effect and facilitate the operation, the only way to expand the wrapping range of the reinforcing sleeve is to make the reinforcing sleeve according to the regular shape of the part including the leaking part. At least 5 people are required to work continuously for 6 hours. The cost of repairing a leaking part is at least 5,000 yuan. The operation time is long, and the manpower and material resources are large. However, using the method of clamping tape to press and plug leaks, a leaking part generally requires at least 3 sets of cards In order to achieve a better sealing effect, the sealing surface of the fixture requires high precision and smoothness, which brings difficulties to the processing and manufacturing of the fixture. At the same time, at least 4 people need to work continuously for 4 hours, and the cost of repairing a leaking part is at least 0.15 Ten thousand yuan, long working hours, high manpower and material resources, and it is difficult to achieve long-term complete sealing of leaking parts in medium-pressure pipelines

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