EN ISO 636-A W 46 3 W4Si1 (varratfém) EN ISO 636-A W4Si1
SFA / AWS A5.18 ER70S-6Welded welding rod W4Si1 / ER70S-6 unalloyed and low alloy structural steels general purpose protective gas tungsten electrodes arc welding.Argon as a protective gas employed.