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.