Svetsning och lödning

Kommittébeteckning: SIS/TK 134 (Svetsteknik)
Källa: CEN
Svarsdatum: den 10 jul 2019
Se merSe mindre
 

This document specifies a method for the assessment of the efficacy of a soft soldering flux, known as the wetting balance method. It gives a qualitative assessment of the comparative efficacy of two fluxes (for example, a standard and a test flux), based on their capacity to promote wetting of a metal surface by liquid solder. The method is applicable to all flux types in liquid form classified in ISO 9454-1.

NOTE It is hoped that future developments using improved techniques for obtaining a reproducible range of test surfaces will enable this method for assessing flux efficacy to be quantitative. For this reason, several alternative procedures for preparing the surface of the test piece are included in the present method.

Kommittébeteckning: SIS/TK 254 (Järnvägar)
Källa: CEN
Svarsdatum: den 25 jul 2019
Se merSe mindre
 

This document specifies requirements for the:

— approval of training facilities, testing and maintaining the skills of aluminothermic welders and welding trainers. It applies to those aluminothermic welding processes compliant with the requirements of EN 14730-1. It requires that the system for training and testing of welders be approved by the railway authority;

— approval of aluminothermic welding contractors. It applies to those contractors using aluminothermic welding processes compliant with the requirements of EN 14730-1 and who employ welders in the possession of a valid permit to weld as defined in Clause 4 of this standard;

— acceptance of the final aluminothermic weld inspections and aluminothermic weld inspectors approved by the railway authority. It does not cover any previous weld inspections by the welder or others.

This document also applies to aluminothermic welds produced on Vignole railway rail 46 kg/m and above, as contained in EN 13674-1.

Kommittébeteckning: SIS/TK 156 (Plast)
Källa: CEN
Svarsdatum: den 10 aug 2019
Se merSe mindre
 

This document specifies the method of testing the knowledge and skill of a welder who is required to carry out welds on thermoplastics in new constructions and repair work.

The skill examination of a welder is an essential condition for the assurance of the quality of the welding work.

The application of this document guarantees that the examination is carried out according to a uniform test procedure.

This document applies when the contractor or the authorities responsible for the application require it.

Gas and water utility network industries with alternative qualification programmes are excluded from this document.

This document applies to the following welding processes:

— hot gas welding: round nozzle, high speed nozzle, wedge;

— extrusion welding;

— heated tool welding: butt, saddle, socket, wedge;

— electrofusion welding: socket, saddle;

— solvent welding: socket.

This document applies to the welding of the following products:

— sheet;

— pipe;

— fittings;

— lining membrane.

This document covers the welding of the following groups of materials:

a) for sheets, pipes and fittings:

— group 1: PVC (including all kinds of PVC-U, PVC-C) or ABS;

— group 2: PP (including all kinds of PP);

— group 3: PE (including all kinds of PE);

— group 4: PVDF;

— group 5: ECTFE or PFA or FEP;

b) for lining membranes and flooring:

— group 6: PVC-P;

— group 7: PE (including all kinds of PE);

— group 8: ECB;

— group 9: PP.

c) for pipes and fittings only:

— group 10: PA-U 11 or PA-U 12