Washington Alloy, TCU SB 06, Filler Metal, .030 in, Silicon Bronze, AWS A5.27 RcuSi-A

Washington Alloy Silicon Bronze is a copper-based filler metal containing 3% silicon and small amounts of manganese, tin, and zinc. Primarily used for MIG, TIG, and oxyacetylene welding of copper, copper-silicon, and copper-zinc base metals to themselves and to steel. The oxyacetylene gas flame should be slightly oxidizing. Keep the weld puddle small in order to promote fast solidification and minimize cracking. A high boric acid flux should be used both before and during welding. Preheating is NOT recommended.

• AWS Specification: AWS A5.27 RcuSi-A
• Material: Silicon Bronze (Copper alloy) ERCuSi-A
• Wire Diameter: .030 in.
• Weight: 30 lb
• Tensile Strength: 50000 psi
• Elongation: 65%
• Brinell Hardness: 80-100
• Electrical Conductivity: 7.0% IACS (annealed)
• Thermal Conductivity: 21 Btu
• Density: 0.308 lbs/in3
• Chemical Composition: Zinc 1.00%, Manganese 1.50%, Tin 1.00%, Iron 0.50%, Aluminum 0.01%, Lead 0.02%
• Operating Temperature Limit: Interpass below 150 F
• Preheat Requirements: Cast iron 600 F, Copper 400-800 F recommended

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