Girth weld heating and coating system

Details Girth weld heating and coating system Girth weld heating and coating system

1991-11-12

1993-02-16

Jones, W. Gary

Coating apparatus

With means to apply electrical and/or radiant energy to work...

Radiant heating

219 85, 219 1075, 118307, 118315, 118DIG11, 118323, B05D 300

Patent

active

051867559

ABSTRACT:
A system for heating and coating a weld joint in a pipe comprising; a heating and coating ring for placement on the pipe over the center of the weld joint; the ring having an open position to permit the same to be placed over the pipe and a closed position wherein the ring surrounds the pipe; the ring having a powder dispenser mounted thereon for dispensing a powdered coating material therefrom onto the surface of the pipe; the ring also having a pair of induction heaters mounted thereon, each induction heater including an induction coil comprising a length of hollow copper tubing wound in an elliptical pattern a multiplicity of times, each coil being bowed correspondingly to the curvature of the pipe; the induction coils being disposed in a cylindrical surface adjacent to, and parallel with, the surface of the pipe when the ring is in the closed position; a motor for rotating the closed ring around the pipe; a source of electrical energy for applying an alternating electric potential to the induction coils to heat the pipe to an application temperature for the coating material; the closed ring being rotated alternately in opposite rotary directions while heating the pipe until the application temperature is reached; the supply of electrical potential to the induction coils being interrupted thereafter; and the coating material being applied thereafter through the dispenser to the thus-heated pipe while the assembly is rotated.

REFERENCES:
patent: 4371295 (1983-02-01), Hart
patent: 4595607 (1986-06-01), Betteridge

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