The invention discloses a large-
diameter thin-wall double-tube sheet and cylinder body circular
seam welding process. The large-
diameter thin-wall double-tube sheet and cylinder body circular
seam welding process comprises following steps of firstly, assembling, wherein two sets of pie plates and cylinder joints are assembled in place, grooves of the
pipe plates and the cylinder joints are same, and the
pipe plates in the same group and the cylinder joints are subjected to
spot welding fixing through multiple tie bar plates; secondly, connection, wherein the front faces of two
pipe plates cling together, multiple pull rods are adopted to penetrate through pipe holes of two pipe plates, two ends of the pull rods are fastened through nuts, and relative positions of the two pipe plates are fixed; thirdly,
welding, wherein annular
seam welding of more than two times are carried out in the grooves of each set of pipe plates and the cylinder joints, and annular seam
welding of the two sets of pipe plates and the cylinder joints is alternatively carried out; fourthly, heat treatment, wherein annular seams of the two sets of pipe plates and the cylinder joints are subjected to heat treatment; and fifthly pull rod and tie bar plate dismounting and mounting. Deforming of the pipe plates can be greatly reduced, the hole position matching degree of the two pipe plates and the subsequent pipe penetrating smooth operation can be ensured, construction is easy and convenient, work efficiency is high, and manufacturing cost is greatly reduced.