Weldcote Metals Deox Copper Is A 98% Coper Filler Metal Used For Mig, Tig, And Oxy-Acetylene Welding Of Copper And Copper-Alloyed Base Metals. Deox Copper Contains Small Amounts Of Phosphorus And Silicon Which Act As The Deoxidizing Agents To Promote Sound Weld Joints. Deox Copper Is Easy Flowing And Produces Weld Deposits That Are Porosity Free, Electrically Conductive And The Color Will Match That Of Copper. Excellent For Joining Copper To Mild Steel, For Overlaying Steel And For The Fabrication Of Cpper Pipes, Tanks And Copper Fittings. The Oxy-Acetylene Gas Flame Must Be Neutral Or Slightly Oxidizing. Tip Size Must Be One To Two Sizes Larger Than The Base Plate. Preheating Should Be Done Only If The Part Is Thick. A Boric Acid Or Borax Flux Is Recommended.