Abstract: The development of welding technology, quality control and assessment of polyethylene pipes were reviewed. Principles, technology, method and quality control of butt fusion and electro fusion were described in details. Several evaluation systems of welding of pressure pipes were summarized and compared, including breaking, non destructive test, long term property analysis, etc. It was pointed out that welding technology of polyethylene pipes and quality evaluation should be paid more attention to.

Key words: polyethylene, pipe, welding technology, evaluation method