WeldThroatArea:

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   Calculates the minimum throat area for a fillet weld.
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   Form:
   a = WeldThroatArea( l )
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   Inputs
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   l          (1,:)  Load (N)

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   Outputs
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   a          (1,1)  Throat area (m^2)

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   Reference: ASTM Standards for weld strength.
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