本文还分析了塑料压力管道热熔对接焊的基本原理，并详细地介绍了热熔对接焊机的基本组成部分以及各部分的主要功能和实现方法。
Theories for butt fusion welding are briefly discussed, and elements of automatic butt fusion welding machine, their main function, and implementation method are briefly analyzed…
本文还分析了塑料压力管道热熔对接焊的基本原理，并详细地介绍了热熔对接焊机的基本组成部分以及各部分的主要功能和实现方法。
Theories for butt fusion welding are briefly discussed, and elements of automatic butt fusion welding machine, their main function, and implementation method are briefly analyzed…
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