Methods for Controlling Composite Quality

The quality of compositing is mainly reflected in bond strength and wall thickness. Therefore, controlling composite quality is equivalent to controlling bond strength and wall thickness. Bond strength is influenced by both pretreatment and medium-frequency/ultrasonic-frequency temperature. Pretreatment achieving the Sa2.5 standard can enable the composite pipe to obtain higher bond strength when threading. On the other hand, by controlling the heating temperature between 180°C and 200°C, the plastic tube can reach its optimal physical state, thereby enhancing bond strength. Wall thickness is determined by both the plastic tube's wall thickness and the metal tube's wall thickness. The wall thickness deviation caused by mature metal tube production processes does not affect the total wall thickness of the lined plastic composite pipe. Therefore, controlling the wall thickness of the plastic tube becomes a top priority.