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Welding actually has many specialized tools and processes, alloys also evolve. Tools have different trade-offs, and a large number of geometric and performance considerations - from environmental concerns (how much oil will spill?) to environment concerns (how do you weld under a blizzard on top of a pole?) there is a lot to learn and keep up with; and can easily, easily take a decade+ master.

Your basic hobbyist weld is like hello-world. As a side note, one sign of a bad engineer is one who underestimates difficulties in fields outside their expertise.

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