A 5F weld is a tube to plate weld where the axis of the tube is horizontal, and the plate is vertical.
It requires being able to weld in overhead, vertical, and horizontal positions and can be challenging. You can read the full article here: http://www.weldingtipsandtricks.com/5f-welding.html
In this video, Andrew Cardin uses 5/32″ 7018 low-hydrogen electrodes to weld this 5F joint.
145 amps using a Lincoln Powermig 210mp.
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