Silicon Bronze Alloy
AWS A5.7 ERCuSi-A
AWS A5.27 RcuSi-A
ASME SFA5.7
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.
Applications:
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.
Supporting Documentation:
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