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This document specifies the dimensions, the method of sampling, the preparation of the test specimens and the conditions for performing the tensile creep test perpendicular to the weld in order to determine the longterm tensile welding factor.
A tensile creep test may be used in conjunction with other tests (e.g. bend test, tensile test, macrographic examination, …) to assess the performance of welded assemblies made from thermoplastics materials.
The test is applicable to welded assemblies made from thermoplastics materials, filled or unfilled such as tubes and fittings, sheets, plates and profiles, but not reinforced, irrespective of the welding process used.
It has been found that a number of the Type 2 specimen dimensions specified in the current version of EN 128143 do not provide a sufficient length of shoulder to enable adequate clamping during the test. In addition, the standard does not specify a maximum specimen thickness and the Type 2 specimen dimensions specified are unsuitable for thicknesses greater than 40mm. The revised document will amend the specimen dimensions to address these issues.
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