Development of Welding Material for Primary Coolant Pipe Automatic Welding in PWRs

Because of the narrow groove and welding process of one pass per layer are used in the automatic welding of primary coolant pipe, the welding material which more purity and suited to the welding process is to be developed in order to guarantee the quality of the weld. We had tested the weld able and the steady of new material by experiment; also we had evaluated the performance of the welding join by fatigue experiments. The result testify that the new welding material is suited to the welding process and can get excellent performance of the weld.