Microstructure and Mechanical Properties of the Butt Joint in High Density Polyethylene Pipe

Table 1

Yield strength and displacement of butt joints at different welding conditions of the HDPE pipes obtained from round U-notched tensile test.

Material code	Heat plate removal time plus time to achieve fusion (s)	Yield strength (MPa)	Displacement (mm)
PE parent	Without welding	25.40 0.60	43.91 1.2
W-PE10	10	24.37 0.48	39.73 1.7
W-PE30	30	25.01 0.70	23.51 0.9
W-PE60	60	23.6 0.82	13.68 0.7
W-PE70	70	8.57 0.91	1.27 0.50