Abstract:In engineering practice, the allposition one side welding without liner of steel penstock has a serious quality problem. Through improvements and tests, this paper proposed a one side butt welding procedure of combinatorial steel liners, which could ensure the welding quality easily and does not need high skill levels of workers. After the new welding procedure was put into effect, its welding qualification rate is up to 98% through nondestructive testing.

Keywords:steel penstock, one side welding;allposition, combinatorial steel liner, ultrasonic testing