30CrMo heat resistant steel pipeline welding construction method

A construction method and heat-resistant steel technology, applied in welding equipment, welding accessories, manufacturing tools, etc., can solve the problems of high welding quality, achieve the effects of improving quality, preventing hydrogen-induced delayed cracks, and effectively controlling

Inactive Publication Date: 2015-04-29
ZHONGYU YUANFA INT CONSTR GRP
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  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there is no 30CrMo heat-resistant steel pipeline welding construction method with high welding quality that can effectively ensure that the welded hydraulic pipeline system can safely withstand its working pressure

Method used

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Embodiment Construction

[0021] The present invention will be further described below.

[0022] In order to solve the above-mentioned technical problems, the 0CrMo heat-resistant steel pipeline welding construction method adopted in the present invention is characterized in that: comprising the following steps,

[0023] A. Clean the pipeline to be welded;

[0024] B. Preheat the pipeline to be welded;

[0025] C. Process the welding groove on the pipe to be welded;

[0026] D. Weld the pipeline;

[0027] E. Heat treatment for the welded pipes.

[0028] Clean the pipes to be welded to remove oil and other impurities on the surface of the pipes. In order to ensure the welding quality, the processing of the groove adopts mechanical processing, and the butt weld of the thick-walled pipe is opened with a U-shaped groove. The method of preheating before welding can effectively prevent delayed cracking caused by hydrogen. Adjust the hardness of the joint after welding by performing heat treatment on th...

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Abstract

The invention relates to a 30CrMo heat resistant steel pipeline welding construction method, in particular to the 30CrMo heat resistant steel pipeline welding construction method which is applied to the high pressure pipeline welding filed. The 30CrMo heat resistant steel pipeline welding construction method is high in welding quality and can effectively guarantee a hydraulic pipeline system after welding to safely bearing the working pressure. The 30CrMo heat resistant steel pipeline welding construction method comprises the following steps of cleaning a to-be-welded pipeline; preheating the to-be-welded pipeline, wherein the preheating method before welding can effectively prevent hydrogen-induced delayed crack. According to the 30CrMo heat resistant steel pipeline welding construction method, a backing welding seam during pipeline welding is easy to generate welding defects, meanwhile thick-wall pipe welding defects are difficult to repair, so that nondestructive examination of the weld joint is achieved after backing welding is achieved, filling and screen welding are performed when the welding has no repair defects, and the defect that gaps of a sealing surface of a high pressure pipeline are uneven can be eliminated through the grinding technology.

Description

technical field [0001] The invention relates to a 30CrMo heat-resistant steel pipeline welding construction method, in particular to a 30CrMo heat-resistant steel pipeline welding construction method applied in the field of high-pressure pipeline welding. Background technique [0002] Designed and built independently by my country, the world's largest die forging press, 800MN die forging press, is a major engineering project related to the lifeline of the country's economy. Digestion, absorption and innovation create conditions for the research and development of large aircraft in my country. Most of the main load-bearing components in the aircraft are made of forgings. Large forgings are the "backbone" of the airframe structure. The structural type, material, performance and quality it chooses directly determine the reliability of the aircraft to a large extent. performance, longevity and cost. [0003] Due to the lack of large-scale die forging equipment, the material uti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/00B23K9/235B23K9/32B23K101/06
CPCB23K9/0052B23K9/235B23K9/32B23K2101/06B23K2103/04
Inventor 杨茂文余震杨如龙潘晓峰罗京
Owner ZHONGYU YUANFA INT CONSTR GRP
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