For a material thickness of 0.75 inches, what is the minimum depth to fill a plug or slot weld?

For a material thickness of 0.75 inches, what is the minimum depth to fill a plug or slot weld?

• A. 0.375 inches
• B. 0.500 inches
• C. 0.625 inches
• D. 0.750 inches

Answer: (C)

The concept being tested is how deep the weld must fill a plug or slot weld to provide adequate joint strength without excessive heat input. For a plate thickness of 0.75 inches, the minimum depth to fill a plug or slot weld is 0.625 inches. This depth ensures enough weld metal is present to transfer shear and fuse with the base metal, while not needing to fully penetrate to the far surface, which could risk burn-through or unnecessary heat. The shallower options (0.375 and 0.500 inches) would not provide sufficient weld metal for strength, and welding the full thickness (0.750 inches) isn’t the required minimum.

The concept being tested is how deep the weld must fill a plug or slot weld to provide adequate joint strength without excessive heat input. For a plate thickness of 0.75 inches, the minimum depth to fill a plug or slot weld is 0.625 inches. This depth ensures enough weld metal is present to transfer shear and fuse with the base metal, while not needing to fully penetrate to the far surface, which could risk burn-through or unnecessary heat. The shallower options (0.375 and 0.500 inches) would not provide sufficient weld metal for strength, and welding the full thickness (0.750 inches) isn’t the required minimum.