journeyman welder

How do I get a welding journeymans license?

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To my knowledge, a generic journeymans license for welding does not exist.

You may be referring to a trade journeyman who welds.

examples:
pipefitter welder
boilermaker welder
ironworker welder
sheet metal worker welder

all require some form of apprenticeship but some give credit for experience or ability to pass welding certification tests.