Depending on the Welding Procedure Specification (WPS), welders typically use vertical-uphill (bottom-to-top) for deep penetration or vertical-downhill (top-to-bottom) for faster production on thinner materials.
Since the pipe is fixed, you are the one moving. welding 5g position
The 5G position, or the , is a critical pipe welding technique where the pipe is held stationary in a horizontal orientation. Unlike the 1G position where the pipe rotates, 5G requires the welder to move around the circumference, transitioning through flat, vertical, and overhead orientations in a single continuous joint. Technical Overview transitioning through flat
The pipe is fixed. You weld from the top , down the sides , and across the bottom . down the sides
The pipe is fixed horizontally with a tolerance of +/- 15º.