WIRE GAS FLAME THERMAL SPRAYING AND TORCH FOR WIRE GAS FLAME THERMAL SPRAYING

摘要

PROBLEM TO BE SOLVED: To make it possible to easily and surely forming a thermally sprayed film on the inner peripheral surface having ruggedness of a small-diameter tube. ;SOLUTION: A compressed air stream A is passed to the circumference of a flame F formed by burning a gaseous mixture composed of gaseous fuel and an oxidizing agent. A thermal spraying wire 17 is supplied toward this flame F and a globule is formed by melting this thermal spraying wire 17 by the heat of the flame. While this globule is finely divided by the compressed air flow A, the globules are accelerated and are sprayed onto a step part 21 on the inner periphery of the small-diameter tube 20, by which the thermally sprayed film is formed on the surface of the step part 21. The thermal spraying angle 6 is made at an angle of 90° or approximate to 90° and the thermal spraying wire 17 is continuously supplied from the outer side of the compressed air A toward the flame F.;COPYRIGHT: (C)1999,JPO