■ Electrothermal fusion: A special electric fusion welding machine is used to connect straight pipes to straight pipes and straight pipes to pipe fittings. Generally used for pipes below 160mm.

■ Hot-melt butt connection: use special butt welding machine to connect pipes, generally used for pipes above 160mm.

■ Steel-plastic connection: Flange, screw thread and other methods can be used to connect.

■ To facilitate construction and ensure construction quality, corresponding tools should also be prepared.

Such as: rotary cutter - cutting pipes; rotary scraper - scraping off the oxide skin on the surface of the pipe; wall scraper - scraping off the scale on the surface of large-diameter pipes; gas cut-off tool - to realize on-site operation of gas cut-off.