The invention discloses a large-
pipe-
diameter thin-wall
pipe post-welded heat treatment device and a using method thereof, and belongs to the technical field of
welding heat treatment. The device comprises steel
pipe supporting seats (1),
electric heating elements (2), insulating
layers (3) on the
electric heating elements (2), thermocouples (4), a binding material (5), an inner pipe wall heat preservation layer (6) and a supporting frame (7), wherein the
electric heating elements (2) are basically equally and uniformly arranged along the outer circumference of a steel pipe (8), and each of the electric heating elements (2) and the corresponding
thermocouple (4) are respectively connected with the corresponding heat treatment
temperature control instrument. During use, the electric heatingelements (2) of the device is electrified and heated, so that an annular weld joint (9) of the steel pipe (8) and the nearby area are heated to the heat treatment temperature, cooling is carried outafter heat preservation, and then the post-welded heat treatment of the steel pipe is completed. By the adoption of the large-pipe-
diameter thin-wall pipe post-welded heat treatment device and the using method thereof, a better
welding heat treatment and heat preservation effect can be obtained, the
heating temperature is controlled accurately, the
heating temperature fluctuation is small, the heat treatment deformation can be reduced, and the performance uniformity after heat treatment can be improved.