Weldingtype (sleeved type)  is the earliest type for crosshole sonic logging pipe. This type ispopular for good price and easier operation.

Oneend of the sonic pipe is welded with one sleeve, the outside diameter is morethan that of bottom pipe.. Put the top pipe into the sleeve and weld them. Itbrings less workload and higher operation efficiency. At the same time,safetycan be ensured.