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I'd bet most people would think that welding metal is a relatively recent development in history.
https://www.thecrucible.org/guides/welding-2/history/
The oldest known examples of welding are small golden boxes that date back to the Bronze age over 2,000 years ago. Archaeologists have found jewelry, dining utensils, and weapons from this time period. in 3000 B.C., Egyptians used charcoal to pressure-weld swords, and in 1500 B.C., iron smelting became more common.