... used in Welding shielded welding, stainless steel smelting, container, steel structure manufacture, mold processing, etc puritystandardunitApplicationoxygen≥99.5GB-T3863-1995bottle/cylinder Steel cutting, welding ... .8GB-6052-85bottle/cylinderChemical industry, welding, casting moldHelium≥99GB/4844-95bottle/ ... ≥99.99 GB/T4842-95Bottle Welding shielded welding, stainless steel smelting, container, steel ...