For a 60-degree fillet weld, which option correctly states the throat thickness as a fraction of leg length?

Study for the Gas Metal Arc Welding Exam, including GMAW, FCAW, and MCAW methods. Use flashcards and multiple choice questions with hints and explanations for effective learning. Get ready for your welding certification!

Multiple Choice

For a 60-degree fillet weld, which option correctly states the throat thickness as a fraction of leg length?

Throat thickness is the minimum cross-sectional thickness of a fillet weld. For a 60-degree fillet, the throat lies along a line that cuts the weld at 45 degrees to each leg, so the throat distance is the leg length multiplied by cos(45°), which equals 0.707 times the leg length. This is why the correct statement uses 0.707 × leg length. The other fractions don’t match the weld’s geometry: 0.5 would come from a different throat orientation, 1.0 would equal the full leg length rather than the minimum cross-section, and 0.25 is too small for a 60-degree fillet.

Throat thickness is the minimum cross-sectional thickness of a fillet weld. For a 60-degree fillet, the throat lies along a line that cuts the weld at 45 degrees to each leg, so the throat distance is the leg length multiplied by cos(45°), which equals 0.707 times the leg length. This is why the correct statement uses 0.707 × leg length. The other fractions don’t match the weld’s geometry: 0.5 would come from a different throat orientation, 1.0 would equal the full leg length rather than the minimum cross-section, and 0.25 is too small for a 60-degree fillet.

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