The answer is: No, ER70S-6 wire is not fully copper. It is a mild steel wire with a thin copper coating.Here’s a detailed breakdown:1. The Core: Steel AlloyThe vast majority of the wire's mass (over 98%) is a steel alloy. The "ER70S-6" classification tells us exactly what this steel is made of:ER: S

Aluminum Welding Wire ER4043 VS ER5356,which one should you choose?

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