They don't have to be "welded" on, there are other methods that meet the requirement of being "permanently" attached.
You don't even have to weld over the pins!Do you mean cross pinned? Welding a muzzle brake/flash suppressor all the way around certainly is one way. The other involves cross pinning and welding over the pins. The purpose is to ensure that the pins can't be removed. Is there another"legal" method?
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I will not dispute on that, because I don't represent the ATF. But a few years ago, one of the local smiths tried his version of "linear" pinning vs radial pinning, he won his case but it was questioned!Doesn't require an FFL.