What is the most difficult type of welding to learn, according to professionals?

While welding may look like a really cool skill to learn, it's not that simple. Professionals mostly agree that one type of welding is the hardest.
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MIG vs. TIG Welding: What’s the Difference?

While the sight of sparks flying around a welding helmet and thick gloves might be common across all types of welding tasks, there are actually different kinds of welding used depending on the ...