What is the recommended number of tacks for joining a 6" pipe size, as described in the material?

What is the recommended number of tacks for joining a 6" pipe size, as described in the material?

• A. 2
• B. 4
• C. 6
• D. 8

Answer: (B)

Maintaining alignment while controlling heat distortion is the main idea behind tack numbers. For a 6-inch pipe, placing four tacks around the joint—roughly at 90-degree intervals—holds the pieces securely as you begin welding and helps prevent movement or warping. Using only two tacks can allow rotation or misalignment once heat is applied, while more than four tacks isn’t usually necessary for this size and can add extra work without added benefit. If your material thickness or specific welding procedure calls for a different pattern, follow those guidelines, but four tacks is the standard recommendation for a 6" pipe.

Maintaining alignment while controlling heat distortion is the main idea behind tack numbers. For a 6-inch pipe, placing four tacks around the joint—roughly at 90-degree intervals—holds the pieces securely as you begin welding and helps prevent movement or warping. Using only two tacks can allow rotation or misalignment once heat is applied, while more than four tacks isn’t usually necessary for this size and can add extra work without added benefit. If your material thickness or specific welding procedure calls for a different pattern, follow those guidelines, but four tacks is the standard recommendation for a 6" pipe.