Silicon Bronze Alloy
AWS A5.7 ERCuSi-A
AWS A5.27 RcuSi-A
ASME SFA 5.27 ERCuSi-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.
Excellent for plain or galvanized steel sheet metal as well as other coated steels. Washington Alloy Silicon Bronze is also used for surfacing areas subjected to corrosion.