BS EN 12814-2:2021 pdf download.Testing of welded joints of thermoplastics semi-finished products - Part 2: Tensile test.
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.2 Symbols and abbreviated terms
For the purposes of this document, the symbols and abbreviated terms given in Table 1 apply.
4 Principle of the test
The test specimen is extended along its major longitudinal axis at constant speed until the test specimen fractures or yields. During this procedure the load sustained by the test specimen is measured.
5 Sampling procedures
The test specimens (welded and unwelded) shall be cut perpendicular to the welded joint at least eight hours after welding.
Each test specimen shall be marked in order to identify its original position within the test piece.
No heat treatment or mechanical straightening operations shall be carried out on the test specimen.
6 Dimensions of test specimens
For tubes of nominal outside diameter D n less than 20 mm, the whole tube shall be tested and the minimum distance between the clamps shall be 200 mm.
8 Mechanical testing Test specimen shall be conditioned to a temperature of (23 ± 2) °C and unless otherwise specified, the test shall be carried out at a room temperature of (23 + − 2 5 ) °C. The test speeds and tolerances shall be in accordance with EN ISO 527-1. For all materials the test speed shall be chosen to ensure that the test is terminated in about one minute. Examples of test speeds for some relevant thermoplastics materials are listed in Annex B. At least five test specimens shall be tested for each welded and unwelded test piece. Welded and unwelded test specimens shall be of the same geometry and shall be tested at the same speed with the same distance between the clamps. If all welded test specimens fracture or yield within the calibrated length, but outside of the weld (L w ), the unwelded test specimen do not need to be tested, and the short-term tensile welding factor shall be taken as 1. In order to achieve a failure in the weld, the test specimens shall be as described in ISO 13953 (Type A only, for thickness less than 25 mm) or in Annex C.BS EN 12814-2 pdf download.