On a 150 mm pipe to be welded in the 5G position, where should four tack welds be located?

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Multiple Choice

On a 150 mm pipe to be welded in the 5G position, where should four tack welds be located?

The main idea is to secure the joint against movement in the 5G position by restraining it from all directions. Four tack welds are placed evenly around the pipe so the restraint is symmetric. Position them at the top, bottom, and both sides of the circumference. This equal spacing locks the pipe in alignment and distributes heat input more evenly as you proceed with welding, helping to prevent distortion and maintain proper fit-up. If tacks aren’t evenly spaced, one area can move or tilt as the weld is built up, making the final weld harder to complete. In practice, the four evenly spaced tack welds around the circumference—top, bottom, left, and right—provide the best initial stabilization for a 5G pipe weld.

The main idea is to secure the joint against movement in the 5G position by restraining it from all directions. Four tack welds are placed evenly around the pipe so the restraint is symmetric. Position them at the top, bottom, and both sides of the circumference. This equal spacing locks the pipe in alignment and distributes heat input more evenly as you proceed with welding, helping to prevent distortion and maintain proper fit-up. If tacks aren’t evenly spaced, one area can move or tilt as the weld is built up, making the final weld harder to complete. In practice, the four evenly spaced tack welds around the circumference—top, bottom, left, and right—provide the best initial stabilization for a 5G pipe weld.

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