Hot gas welding
From Plastics Wiki, free encyclopedia
Hot Gas Welding is a plastic welding process, utilizing heat of hot gas stream. The gas (usually air) is heated by electric heating elements mounted within the welding gun. The torch (welding gun) directs the heated gas toward the work piece surfaces and a rod of filler material. The edges of the joined parts and the filler rod material are fused together and pressed. The polymer molecules are cross-linked when the work pieces cool down, forming a strong joint.
Hot Gas Welding is manually operated process requiring high level of the operator skill. Some polymers (e.g. Low Density Polyethylene (LDPE), High Density Polyethylene (HDPE)) oxidize at incresed temperature therefore they are welded by hot nitrogen.
Applications
- Containers;
- Tanks for storage chemicals;
- Ventilation ducting;
- Tubes;
- Repair works.
Process: Contact welding • High frequency welding • Hot gas welding • Hot plate welding • Spin welding • Ultrasonic welding • Vibration welding
Equipment: ultrasonic welding machine
See also: Plastic thermoforming • Injection molding • Blow molding • Plastic extrusion • Compression molding • Rotational molding
