초록 ▼

A method and apparatus for thermal fusion of thermoplastic pipes. Heat is applied to a joint interface between thermoplastic pipes and a thermoplastic coupling at a slow rate to raise the temperature of the interface to a predetermined preheat temperature, and then at a rapid rate to quickly raise t

A method and apparatus for thermal fusion of thermoplastic pipes. Heat is applied to a joint interface between thermoplastic pipes and a thermoplastic coupling at a slow rate to raise the temperature of the interface to a predetermined preheat temperature, and then at a rapid rate to quickly raise the temperature to the fusion point, resulting in proper localized fusion heating at the joint interface.

대표청구항 ▼

A method of developing a predetermined fusion welding temperature at an interface between a thermoplastic collar and abutting thermoplastic pipe sections over which such collar is telescoped, comprising: increasing the temperature of the interface at a relatively slow preheating rate; sensing the at

A method of developing a predetermined fusion welding temperature at an interface between a thermoplastic collar and abutting thermoplastic pipe sections over which such collar is telescoped, comprising: increasing the temperature of the interface at a relatively slow preheating rate; sensing the attainment of a predetermined preheat temperature at the interface; increasing the temperature of the interface at a relatively fast fusion rate only upon attainment of said predetermined preheat temperature; sensing the attainment of said predetermned fusion welding temperature at the interface; and allowing the interface to cool when said predetermined fusion welding temperature has been attained.