5Esaulenko G B, et al. Study of strength characteristics of polyethylene butt welded joints and development of testing methods [ J ]. Welding in the Word, 1991,29 ( 3 ) :301 - 306.
6Nishimura H, et al. Evalution of impact properties of butt-fusion-jointed medium-density polyethylene pipes for gas distribution[ J]. Polymer, 1991,32( 12 ) :2199 -2204.
7Bucknall C B ,et al. Hot plate welding of plastics : factors affecting weld strength [ J ]. Polymer Engineering and Science, 1980,20 (6) :432 - 440.
8Nonhof C J. Optimization of hot plate welding for series and mass production [ J ]. Polymer Engineering and Science, 1996,36(9) :1184 - 1195.