Abstract: A method for solid-state, one-shot, butt-welding of multiple coaxial metal pipe subassemblies that have a prescribed annular clearance to allow them to be welded separately yet simultaneously is described. The nested pipes or tubes making up of these subassemblies can thus be joined end to end to form pipelines or wells for oil, gas and geothermal and the like with specific desired advantages over conventional single-wall pipelines or wells casings. The advantages include an ability to monitor the condition of all or selected portions of the pressure envelope constituted by the pipeline or well casing and thereby identify damage with ample advance warning before failure and leakage or major spills occur.

Abstract: The present invention relates to an improved process and embodiments for girth welding of metal tubes and pipes and other shapes based on existing high speed, one-shot welding processes which have been modified to integrate a rapid heat treatment instantly after the weld is completed, while the weld is still hot and above specified transformation temperatures. The principle advantages are improved mechanical properties in the weld with a reduced cycle time to achieve them versus conventional separate post weld heat treatments such as tempering or quenching and tempering.

Abstract: A method for solid-state, one-shot, butt-welding of multiple coaxial metal pipe subassemblies that have a prescribed annular clearance to allow them to be welded separately yet simultaneously is described. The nested pipes or tubes making up of these subassemblies can thus be joined end to end to form pipelines or wells for oil, gas and geothermal and the like with specific desired advantages over conventional single-wall pipelines or wells casings. The advantages include an ability to monitor the condition of all or selected portions of the pressure envelope constituted by the pipeline or well casing and thereby identify damage with ample advance warning before failure and leakage or major spills occur.

Abstract: An apparatus for induction friction solid state welding a body having a work piece receiving bore. A stationary chuck is provided for securing a first tubular workpiece in the bore. A moving chuck is provided for securing a second tubular workpiece in bore. An induction heating coil is movable between an operative position and a stored position. An expandable cylinder moves the moving chuck toward and away from the stationary chuck. A torque transmission collar is used to rotate the moving chuck.

Abstract: An apparatus for induction friction solid state welding a body having a work piece receiving bore. A stationary chuck is provided for securing a first tubular workpiece in the bore. A moving chuck is provided for securing a second tubular workpiece in bore. An induction heating coil is movable between an operative position and a stored position. An expandable cylinder moves the moving chuck toward and away from the stationary chuck. A torque transmission collar is used to rotate the moving chuck.