Abstract: A process for producing clad pipe comprises forming a hollow body (S10) of base material, bonding a cladding material metallurgically to the base material (S12) to form a composite body and subsequently extruding the composite body to form a pipe. This process allows the metallurgical bond to be validated using non-destructive methods prior to extrusion. Any areas that are unbonded will be detected, thereby reducing wastage. Moreover, because the metallurgical bond is achieved prior to extrusion, the cladding thickness is controlled during the extrusion process, avoiding migration of the clad material into the base material by disproportionate amounts.

Abstract: A boring apparatus comprises an elongate support body adapted to be rotatable by a machine tool spindle, a cutter mounting body releasably securable to the end of the support body remote from the machine tool spindle and is provided with a cutter guide which slidably receives a cutter therein which is constrained by the guide to be displaceable in an adjustment direction inclined to the rotational axis of the elongate support body. An adjustment member is disposed within the elongate support body and is movable along an axis substantially coaxial with the rotational axis of the elongate support body, and an interengaging coupling on the adjustment member and on the cutting tool is provided whereby movement of the adjustment member along its axis of motion induces movement of the cutting tool in its adjustment direction.