Argon used in Welding shielded welding, stainless steel smelting, container, steel ... , cuttingpure hydrogen≥99.99GB/T7445-1995bottle/cylinder Raw material gas, high-altitude weather balloon used in chemical industry.pure Helium≥99 ... , analysis Pure argon ≥99.99 GB/T4842-95Bottle Welding shielded welding, stainless steel smelting, container, steel structure manufacture, mold processing, etc. TIG argon