What is alloy of solder copper or iron?

Answer 1

• solder - alloy, typically of tin and lead although other metals are sometimes included (e.g. silver) and there are also now lead free solder alloys available
• copper - pure
• iron - may be mixture or alloy or pure depending on type of iron:

1. elemental iron - pure, but mechanically weak
2. cast iron - alloy, of iron and carbon mechanically strong but brittle
3. wrought iron - mixture, of cast iron and slag inclusions treated with many heating and hammer forging cycles which reduces the brittleness and improves the flexibility