1概述近几年来,随着PE管(埋地用聚乙烯管)这种非金属材料在压力管道生产中的应用,PE管特别是PE燃气管道焊接技术,需要认真研究解决。2 PE管的特点及应用范围2.1 PE管的特点PE管的原材为聚乙烯,它是一种高分子量的有机合成材料。PE管一般采用中密度和高密度聚乙烯,PE管之所以在近几十年里发展如此迅速’与其本身固有特性是分不开的。其运用于燃气输送的优 1 Overview In recent years, with the PE pipe (buried polyethylene pipe) of this non-metallic materials in the production of pressure pipe, PE pipe, especially PE gas pipe welding technology, need to seriously study and solve. 2 PE pipe characteristics and application scope 2.1 The characteristics of PE pipe PE pipe is made of polyethylene, which is a high molecular weight organic synthetic materials. PE pipe is generally used in medium-density and high-density polyethylene, PE pipe has developed so rapidly in recent decades’ and its inherent characteristics are inseparable. Its use in gas transportation excellent