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AWS D17.1 is the specification document used for aerospace welding certification.
1G is flat position and probably the most common position used to certify welders in aerospace maintenance, repair, and overhaul (MRO) shops.
2G is horizontal position.
3g is vertical.
Sometimes these other weld test positions are required by companies wanting a broader range of qualification.
this video provides settings and tips for passing a 2g groove weld .041" thick carbon and low alloys steels.

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