Butt weld gap
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May I ask, when welding standard American flanges to steel pipes, is it necessary to leave a gap at the weld joint? If so, how much should that gap be? If both the pipe and the flange groove ends are at the standard range of 0.8mm to 1.6mm, can a thorough weld be achieved by welding the two surfaces together with a root pass?
For steel pipes with a thickness of 8–16 mm, leaving a gap of 2–3 mm is sufficient for thorough welding; the larger the pipe thickness, the larger the gap should be
When welding pressure pipelines, the basic method is to use TIG welding for the root pass and manual welding for the cover pass, or to use TIG welding for the entire process; generally, a gap of 1-2 mm is left.
In simple terms, the gap should be at least large enough to allow the welding wire to fit in
When I was in practice*, my mentor was basically that person. . During the butt welding process, it is sufficient to place the welding wire in the middle. . . In more written terms, it’s about 1 to 2 millimeters