What is the principle of heat shrinkage of fluorocarbon aluminum veneer?
When assembling fluorocarbon aluminum veneers by hot weaving, for example, when using a gas welding flame to heat the extended fluorocarbon aluminum veneer. Because aluminum has no obvious color change at high temperatures. So it is often overheated. Aluminum melts at a temperature of 660℃, so it is very important to control the heating temperature. The heating temperature can be monitored by using a heat-sensitive paint or a heat-sensitive crayon that changes color at 110°C.
Methods are as follows:
1) Make two ring marks around the heating area of the fluorocarbon aluminum veneer with heat-sensitive paint or crayon.
2) Move the flame evenly and heat the stretching and deforming area.
3) Stop heating when the heat-sensitive paint or crayon mark changes color. At this time, the temperature at the center of the heating area should be between 300-420°C. There is a considerable gap with the melting point of aluminum, which can effectively control the heating temperature. In addition, for the heat-shrinking area, it should be cooled very slowly to avoid deformation caused by excessive shrinkage of the fluorocarbon and aluminum plates.
