For pipe that is 4 inches or smaller, how many tacks should be used?

For pipe that is 4 inches or smaller, how many tacks should be used?

• A. 2 tacks
• B. 3 tacks
• C. 4 tacks
• D. 5 tacks

Answer: (B)

Holding a pipe joint steady during welding relies on tacking at key points around the joint to prevent movement. For pipe that is 4 inches or smaller, three tacks placed evenly around the circumference (about 120 degrees apart) are used. This pattern locks the pieces in alignment and preserves roundness while you complete the weld. Two tacks may not provide enough restraint, allowing wobble as heat causes expansion and contraction. Four or five tacks are more than needed for this size and can complicate the fit-up without adding stability. Once tacked, you can proceed with the weld sequence, keeping heat distribution balanced.

Holding a pipe joint steady during welding relies on tacking at key points around the joint to prevent movement. For pipe that is 4 inches or smaller, three tacks placed evenly around the circumference (about 120 degrees apart) are used. This pattern locks the pieces in alignment and preserves roundness while you complete the weld. Two tacks may not provide enough restraint, allowing wobble as heat causes expansion and contraction. Four or five tacks are more than needed for this size and can complicate the fit-up without adding stability. Once tacked, you can proceed with the weld sequence, keeping heat distribution balanced.