Pipe systems made of polymer materials in large dimensions are being utilised ever more frequently, particularly in water supply and waste water disposal. In addition to the material selection, the joining technique and, resulting from this, the strength of the joint are important factors during the implementation of such projects since these influence the total service life of the pipe system to a crucial extent. In various investigations, different welding parameters and the strength of these welds were tested for the heated tool butt welding technique in the case of large-diameter pipes with high wall thicknesses. The test results clearly show the suitability of heated tool butt welding for large wall thicknesses. In addition to heated tool butt welding, sleeve welding with an incorporated electric heating element is also being applied to large-diameter pipes to an increasing degree. Due to the principle, no welding factor can be determined in the case of this welding process. Here, the tensile creep test according to DVS 2203-4, Supplement 1 has proven to be suitable for checking the weld quality.
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