How to butt weld 2 pipes together straight?

MOPARoldtimer said

"Be a bit cautious with anything galvanized, the coating is hazardous..."

Right. Would a normal painting respirator prevent inhaling these fumes, or should one use a supplied air system, do you think? I've seen plans for making a supplied air system that look pretty simple, plus I also really need one for sandblasting.

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For galvanized structural fabrications, the zinc coating should be removed at least one to four inches from either side of the intended weld zone and on both sides of the piece. Grinding back the zinc coating is the preferred and most common method; burning the zinc away or pushing back the molten zinc from the weld area also are effective.

http://www.galvanizeit.org/designin...iderations/welding/welding-after-galvanizing/