Heat-flux gage, manufacturing method and manufacturing device thereof

A manufacturing method of a heat-flux gage comprising:

• a step of disposing a cylindrical body having a receiving space therein, and a foil mounting hole on one end thereof;
• a step of disposing a foil including a heat absorption surface, an inner surface facing the heat absorption surface, and a radiant side surface connecting the heat absorption surface and the inner surface;
• a foil welding step for point welding a foil lead wire on a center of inner surface of the foil;
• a body welding step for point welding a body lead wire on an opposite end of an end on which the foil mounting hole is formed;
• a assembly fixture inserting step for inserting an assembly fixture having a foil lead wire hole therein into the receiving space of the cylindrical body;
• and
• a foil assembly step for inserting the foil lead wire through the foil lead wire hole of the assembly fixture and for assembling the circular foil into the foil mounting hole in a force fitting method.