In this paper,the welding performance,the control of welding material δ ferrite and the selection of post-weld heat treatment parameters of SA-312TP316H pipe for utility boiler with heavy caliber and large thickness are analyzed,as well as the performance of the welded joint was tested. The test results show that the matched welding material with 5% ～10% δ ferrite has good weldability,controllable weld quality,and the mechanical properties of the welded joints can meet the requirements of the standards and engineering applications.