The chemical process industry (CPI) faces many challenges when dealing with corrosive and highly purified environments both during processing and when disposing of process waste and effluent. The combination of high temperatures and pressures severely impacts the life of conventional systems and successfully preventing corrosion requires alternative systems that are cost effective, safe and environmentally responsible.

Hot pressure welding

Before the hot pressure welding is carried out, we need to know the necessary theoretical knowledge. Thermal pressure welding is a kind of hot-melt welding that provides sufficient heat and sufficient pressure. Here we must ensure that the welding interface temperature must reach 673.15K, the pressure reaches 1-2MPa, so in order to ensure the welding progress, we need to do the corresponding mold to ensure the successful completion of the hot pressure welding. After all is completed, the FEP film can be welded by pressurizing and heating the interface between the nozzle and the head.

(2) hot air welding

The same hot-air welding of PTFE is also a kind of hot-melt welding. It is much simpler than hot-pressure welding. It does not need so many molds. After the nozzle is placed, the PFA electrode and the hot air welding gun higher than 713K are used first. Preheating is then carried out on the weld for continuous welding.

Note: Whether the temperature of hot-pressure welding or hot-air welding is higher than the melting point of polytetrafluoroethylene, PTFE may be cracked at this temperature, and highly toxic gases such as perfluoroisobutylene may be generated during the cracking process. Therefore, the welding should be carried out in a ventilated environment. When the conditions are not allowed, such as lining the PTFE tank, the wind must be blown by the fan to ensure the air flow and at the same time wear a gas mask to ensure safety.