2　Terms

2.0.1　Butt-and-wrapped joint

Abut connector end face with multi-layers of resin-impregnated reinforcing fiber fabric upper as one connector.

2.0.2　Heat fusion joint

Use special tool heating connection part，forming a joint by pressure fusion when it's melted.

2.0.3　Electrofusion joint

Insert the tube or pipe connection parts into the special electrofusion fitting of embedded resistance wire，forming a joint by heating fusion by electricity.

2.0.4　Hot gas welded joint

With hot air or hot inert gas heating the connection surface，and then pressing the two surfaces together and adding filler materials to achieve fusion form joint in this way.