CEN/TC 121/WG 18 - Terminology

This standard constitutes a compilation of technical terms and definitions specifically related to welding and allied processes.

This European standard describes by pictorial representation most of the more common terms, in English, French and German, for types of joints, joint preparation and welds. This standard can be used on its own or in conjunction with EN 1792 and other, similar standards.

This International Standard pertains to types of joint preparation for metal-arc welding with covered eectrode, gas-shielded metal-arc welding and gas welding on steel ( see clause 3 and 4).  It applies to joint preparation for fully-penetrated butt welds, except in the case of some recommended types of joint preparation (reference numbers 3.10A, 3.10B and 4.10.10C); if a butt weld is not possible or necessary, special arrangements need to be made. For not-fully-penetrated butt welds, types of joint preparation and dimensions welds, types of joint preparation and dimensions differing from those specified in this International Standard may be stipulated.  The root gaps referred to in this International Stadard are those gaps presented after tack welding, if used.  Consideration should be given to altering the joint preparation details (where appropriate) to facilitate temporary backing, ® one-sided welding ¯, etc.