How is the fillet weld throat thickness related to the leg size in a 45-degree fillet?

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Study for the GMAW Welding Level 2 Test. Master GMAW welding techniques with multiple choice questions and detailed explanations. Prepare confidently for your exam!

Multiple Choice

How is the fillet weld throat thickness related to the leg size in a 45-degree fillet?

Explanation:
In a fillet weld, the leg size is the length of each weld leg along the two pieces being joined, while the throat thickness is the shortest distance from the weld root to the face of the weld. For a 45-degree fillet, the cross-section forms a right isosceles triangle, with the weld face as the hypotenuse and the two legs equal to the leg size. The throat is the altitude to that hypotenuse, which in this triangle equals the leg length multiplied by sin(45°). Since sin(45°) is 0.7071, the throat thickness is about 0.707 times the leg length.

In a fillet weld, the leg size is the length of each weld leg along the two pieces being joined, while the throat thickness is the shortest distance from the weld root to the face of the weld. For a 45-degree fillet, the cross-section forms a right isosceles triangle, with the weld face as the hypotenuse and the two legs equal to the leg size. The throat is the altitude to that hypotenuse, which in this triangle equals the leg length multiplied by sin(45°). Since sin(45°) is 0.7071, the throat thickness is about 0.707 times the leg length.

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