ER Cu filler metal is deoxidized copper with small quantities of phosphorus, silicon, tin, manganese and silver. The phosphorus and silicon are primarily deoxidizers, and silicon and other elements improve fluidity and ease of welding. This metal is normally used to weld deoxidized copper (C12000 and C12200) and electrolytic tough pitch copper (C11000). Preheating is desirable for most work, but it is essential for heavier gauge welding. Preheating temperatures of 400°F to 1OOO°F (205°C to 540°C) are suitable.
| Standard | Alloy | Chemical Composition(%) | Solidus | Liquidus | Application |
| AWS A5.7 | ERCu CuSn1 | Cu:Balance Sn:1.0 Mn:0.5 Si:0.5 P:0.15 Al:≤0.5 Pb:0.5-1.5 Other:≤0.5 | 1020℃ | 1050℃ | - |
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