DIN - DVS 2212-3
Testing of Plastics Welders - Test Group III - Lining membranes in geotechnical and hydraulic engineering
Organization: | DIN |
Publication Date: | 1 October 1994 |
Status: | active |
Page Count: | 16 |
ICS Code (Welding, brazing and soldering in general): | 25.160.01 |
scope:
This Guideline applies to testing the knowledge and skills of welders who are to weld original and repair welds on plastic lining membranes in the fields of geotechnical and hydraulic engineering.
It is to be used in all situations where clients, or the agencies responsible for this field of application, require the work of certified plastics welders.
This part of Guideline DVS 2212 covers hot-gas extrusion (HE), hotgas lap (HL) and heated wedge (HW) welding processes on lining membranes made of PE-HD, ECB and PVC-P according to Table 1. If necessary, the practical skills in Sub-Groups III-4 and III-5, or III-6 and III-7, are to be demonstrated on a work test.
If lining membranes made of other materials is to be included, a corresponding, representative test specimen must be produced and tested accordingly. Test specimen and requirements are determined by the plastics welder examiner in accordance with this Guideline. The test specimens and the scope of the test are to be entered on the blank lines on the back of the Test Certificate (Enclosure 4).
Part 1 of Guideline DVS 2212 covers hot-gas welding with torch separate from filler rod (HT), hot-gas string bead welding (HS) and heated tool butt welding (HB) processes on tubes and sheets made of the materials PVC-U, PE-HD, PP-H, PP-B, PP-R and PVDF. Part 2 of Guideline DVS 2212 covers the hot-gas extrusion welding (HE) process on tubes and sheets made of the materials PE, PP-H, PP-B and PP-R.
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