Stress-reducing welding method for repairing metal pipeline on site
A technology for metal pipes and welding methods, applied in welding equipment, metal processing, metal processing equipment, etc., can solve the problems of difficult performance assurance and complicated welding operations, and achieve the goal of reducing assembly stress, reducing welding restraint stress, and increasing economic costs. Effect
Active Publication Date: 2021-05-28
SHENYANG NORTH TRUE VACUUM TECH
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Problems solved by technology
[0003] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a stress-relief welding method for on-site repairing of metal pipelines, which solves the problem of complicated welding operations during installation and maintenance of pipelines of two different materials in the prior art. The problem that the performance is difficult to guarantee
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[0021] A stress-relief welding method for on-site repairing of metal pipelines, comprising the steps of:
[0022] Step 1, determine the welding method according to the pipe material, pipe diameter, pipe wall thickness and construction conditions to be welded, and conduct welding process evaluation according to the technical requirements to determine the correct welding process parameters;
[0023] Step 2. Prepare the groove processing of the welded pipe fittings according to the technical parameters of the process evaluation. The groove processing requirements shall be carried out by machining, and the groove size shall be carried out in accordance with national standards or corresponding technical standards;
[0024] Step 3: Select a pipe fitting with relatively good welding performance among the two welding pipe fittings, and use machining equipment to open a stress groove at the pipe end; the distance between the center of the stress groove and the butt welding groove is wit...
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Abstract
The invention relates to a stress-reducing welding method for repairing a metal pipeline on site. The stress-reducing welding method for repairing the metal pipeline on site comprises the following steps: firstly, determining pipe sections with relatively high weldability according to the weldability of dissimilar metal pipes, and forming stress-reducing grooves in certain positions away from welding ends, of the pipe sections; and during butt welding for the two pipes, releasing the restraining stress during welding through low-rigidity deformation of the stress grooves, so that the joint welding is in a low-stress state, and then the generation of cracks at the welding part is avoided. After the joint welding between the dissimilar steel metal pipes is completed, performance adjustment is carried out, and detection is qualified, repair welding for the stress grooves can be carried out. According to the invention, the welding restraint stress of the pipe joint can be reduced, and the repair welding process difficulty for the stress grooves can be reduced.
Description
technical field [0001] The technology of the invention belongs to the technical field of equipment pipeline installation and maintenance in large industrial enterprises, and specifically relates to a stress-reducing welding method for on-site repair of metal pipelines, which is mainly used in the fields of petrochemical, industrial boiler and other major equipment pipeline installation and maintenance. It is especially suitable for welding and maintenance of pipelines with two different performances. Background technique [0002] In the production of large industrial enterprises such as petrochemical, boiler and shipbuilding, on-site installation and maintenance welding of pipelines are often encountered. At this time, it is generally difficult for the butt joints to fully meet the ideal state, so that the joints are under high stress during the welding process. Especially in the welding of large-diameter thick-walled pipes. For welding maintenance in some cases, the condi...
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Patent Timeline
Login to View More IPC IPC(8): B23K9/167B23K9/235B23P6/00
CPCB23K9/167B23K9/235B23P6/00B23K2101/06
Inventor 蒋应田黄小诚徐世雄蒋常铭靖爱群邓跃兵蔡永梅蒋新愿马喜龙魏哲如温斌
Owner SHENYANG NORTH TRUE VACUUM TECH