Question

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Explanation:

Analyze the joint preparation requirement

Using the Butt Joint Definition and Groove Weld Dimensions knowledge points

• Square butt joints are typically used for thinner materials, generally up to \(1/8\) inch (\(3.2\text{ mm}\)) thick, as full penetration can be achieved without beveling.
• For base metals thicker than \(1/8\) inch, complete joint penetration requires preparing the edges with a bevel, V, J, or U groove to allow the weld metal to penetrate the full thickness of the joint.

Evaluate the given options

• Option 1: \(3/16"\)
• Option 2: \(1/8"\)
• Option 3: \(1/4"\)
• Since edge preparation (bevel, V, J, or U groove) is recommended when the metal thickness exceeds \(1/8"\), the correct threshold value to fill in the blank is \(1/8"\).

Answer:

• (A) 3/16"
• (B) 1/8" (Correct answer)
• (C) 1/4"