SN EN 439:1994被替代
Welding Consumables - Shielding Gases For Arc Welding And Cutting
出版：Swiss Standards
专家解读视频
Classifies shielding gases in accordance to their chemical properties as a base for the approval of shielding gas and filler wire combinations. Also specifies gas purities and mixing tolerances. Coverage includes: designation, gas cylinders, forms of supply, and purities and dew point.
BS EN 439:1994 - Identical
DIN EN 439 (1995-05) - Identical
ONORM EN 439:1995 - Identical
NEN EN 439:1994 - Identical
SS EN 439 Ed. 1 (1995) - Identical
UNE EN 439:1995 - Identical
UNI EN 439:1996 - Identical
NS EN 439 Ed. 1 (1994) - Identical
NF EN 439:1994 - Identical
NBN EN 439:1994 - Identical
I.S. EN 439:1995 - Identical
