Barrel mounting type large-caliber thick-wall connecting pipe of boiler and pressure vessel and connecting method

Abstract

The invention discloses a barrel mounting type large-caliber thick-wall connecting pipe of a boiler and a pressure vessel and a connecting method. For a long time, welding grooves of barrel mounting type or seat type large-caliber thick-wall connecting pipes (called large connecting pipes for short) of boilers, pressure vessels, nuclear power and other pressure-bearing equipment are most in a saddle-shaped curved face form, and along with constant changing of shapes of surfaces around barrel holes, the structural forms of the grooves are single. The problems that the flame gas cutting qualityis poor, hardening layers on the surfaces of the grooves are not ground and removed thoroughly, the numerical control machining period is long, and the manufacturing cost is high exist. The barrel mounting type large-caliber thick-wall connecting pipe comprises a connecting pipe body. The shape of a welding groove on the bottom face of the connecting pipe is formed by multiple planar welding grooves, a welding groove of the type D is formed by the welding groove and the outer surface of a barrel, and the tilt angle of each planar welding groove ranges from -35 degree to 40 degrees. The barrelmounting type large-caliber thick-wall connecting pipe is applied to design and manufacturing of the manual welding rod arc welding groove structure of the barrel mounting type large-caliber thick-wall connecting pipe of the boiler and the pressure vessel.

Description

Technical field: [0001] The invention relates to a large-diameter thick-wall connecting pipe placed in a boiler and a pressure vessel cylinder and a connection method, and relates to the field of design and manufacture of pressure-bearing equipment such as boilers, pressure vessels and nuclear power equipment, and is used for supercritical, supercritical Supercritical power station start-up separators and water storage tanks and other large pipes, specifically related to similar structures and sizes of pressure equipment cylinders or cones placed large-diameter thick-walled pipes or flanges with manual electrode arc welding Welding groove structure design and manufacturing techniques. Background technique: [0002] For a long time, most of the welding grooves of boilers, pressure vessels, nuclear power and other pressure-bearing equipment cylinders placed or seated large-diameter thick-walled pipes (referred to as large pipes) are in the form of saddle-shaped curved surfaces...

AI Technical Summary

Problems solved by technology

[0004] When CNC boring and milling is used for the groove of the pipe joint surface, it is necessary to bore and mill the blunt edge arc of the groove first, and then compile the CNC program and use the small round milling head to process all the groove surface, which has small processing volume, low efficiency and long cycle; and after processing The obvious knife lines left need to be smoothed by hand

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