Girth weld heating and coating method

Details Girth weld heating and coating method Girth weld heating and coating method

1990-05-29

1991-12-10

Pianalto, Bernard

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427197, 427202, 427319, 4273833, 427386, 427405, 427410, B05D 302

Patent

active

050716727

ABSTRACT:
A process for heating and coating a weld joint in a pipe comprising placing an open heating and coating ring on the pipe over the center of the weld joint; the heating and coating ring being an articulated yoke adapted to encircle the pipe when the ring is in the closed position and comprising an upper yoke section and two side yoke sections which pivot with respect to the upper yoke section, a pair of releasable locking devices mounted on the upper yoke section for engaging the side yoke sections when the latter are pivoted outwardly away from each other to an open position of the ring thereby locking the side yoke sections in the open position; the upper yoke section having a powder dispensing system mounted thereon for later dispensing a powdered coating material therefrom onto the surface of the pipe; each side yoke section having an induction heating assembly mounted thereon, each induction heater assembly including an induction coil comprising a length of hollow copper tubing wound in an elliptical pattern a multiplicity of times, each said coil being bowed correspondingly to the curvature of said pipe.

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