Postweld heat treatment process for large-diameter thick-wall pipeline

The invention relates to the technical field of welding heat treatment, and discloses a large-diameter thick-wall pipeline postweld heat treatment process which comprises the following steps: S1, acquiring characteristic data of a welded pipeline; s2, the installation position of a temperature measuring element is determined based on the characteristic data, and the temperature measuring element is fixed to the inner wall and the outer wall of the welding connector in a spot welding mode; s3, heat preservation cotton is installed on the welding pipeline; s4, a medium-frequency induction heating device is installed on the welding pipeline; s5, postweld heat treatment parameters are set; s6, medium-frequency induction heating is carried out; s7, cooling the welded pipeline subjected to heat treatment; in the steps S1 to S7, the inner wall and the outer wall of the welded joint are monitored in different areas; and the wall temperature of the welded joint in the heat treatment process is monitored in real time.