The major cause of a welding crack is when internal stresses exceed the strength of the weld metal, the base metal, or both. Learn how to stop welding cracks.
the plastic material is still under a high temperature but the shear force disappears and the orientation is relaxed (orientation only maintains when the shearing and solidification happen simultaneously). For amorphous plastic, when the orientation is relaxed, the shrinkage...
Heat the Plastic:Cut your plastic sheet to fit the frame and heat it in the oven or under a grill until it sags slightly. Forming Process:Quickly place the heated plastic and frame over your mold and turn on the vacuum cleaner. The plastic will be sucked down, forming around your object...