# 1982 York
The weld strength of some butt welds and extrusion welds in pipeline systems, made of the newer PE types, has been evaluated by means of short-term and long-term tests. Butt welding appears to be a reliable jointing method. Welding strength is almost independent of the heating plate temperature and weldinq pressure. A suitable non-destructive testing (NDT) method is not available. Careful extrusion weldinq also gives a good weld quality.