- Plastic products are typically made in molds. Some vinyl products are made in pieces that have to be fused together. The vinyl welding process is much different than the process of welding metals, but they both have the same goal: to create a strong both between the two pieces and create a structurally sound product.
- Ultrasonic plastic welding is performed by electrical frequencies that are vibrated into plastic from a metal welding tip. High frequencies vibrate rapidly through sheets of polypropylene, joining them as the resonance gets higher. This method is used mostly for making plastic pieces in the medical field.
- Fusion welding is commonly used in the manufacturing of frames for vinyl windows. The corners of the window frames are heated with a high temperature iron on both pieces. The pieces are then joined quickly so they strongly adhere to each other. The pieces cool, forming a welded piece. This weld will be the strongest point of the window.
This technique is also used in plumbing for joining PVC pipes. Eliminating collars creates less chance of leaks. - Like welding metal, a rod is used to join the materials. The difference is this rod is made of plastic. Hot gas is pushed into the welding tool to melt the plastic rod as it comes in contact with the joint that is being welded.