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Weld Design and Specification

1 Weld Design and Weld Design and SpecificationSpecificationJim Glancey, PEJim Glancey, PEDepts. of Depts. of BioresourcesBioresourcesEngineering Engineering & Mechanical Engineering& Mechanical EngineeringUniversity of DelawareUniversity of can t explain everything ..I can t explain everything ..4 in6 in1000 ftInside weld entire length1/4 2 Factors in Weld DesignFactors in Weld DesignIIStrength (static and/or fatigue)Strength (static and/or fatigue)IIMaterial and the effects of heatingMaterial and the effects of heatingIICostCostIIDistortionDistortionI IResidual StressesResidual StressesIIEasy to WeldEasy to WeldStatic StrengthStatic StrengthIStress - strain diagramStrain ( ) = Stress ( )= FA LLyieldultimate(tensile)FFAL3 Shear StrengthShear StrengthIIn general, material fails in shear due to distortion (at a molecular level)ICriteria for failure : Ductile: Shear Strength ~ Tensile Strength brittle .

ICriteria for failure: ... • Brittle: Shear Strength ~ 0.75 Tensile Strength IWeld strength analysis is generally based on Shear Strength. 4 Static Strength of Welds ... 0.707w * h Butt Fillet h = throat size! Weld Size vs. Throat Size 1/8 75o 3/8 h = plate thickness = weld size Butt h = 0.707 * plate thickness 0.707 * weld size 1/4 Fillet. 5 ...

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Weld Design and Specification - University of …

udel.edu

1 Weld Design and Specification Jim Glancey, PE Depts. of Bioresources Engineering & Mechanical Engineering University of Delaware jglancey@udel.edu

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ICriteria for failure: ... • Brittle: Shear Strength ~ 0.75 Tensile Strength IWeld strength analysis is generally based on Shear Strength. 4 Static Strength of Welds ... 0.707w * h Butt Fillet h = throat size! Weld Size vs. Throat Size 1/8 75o 3/8 h = plate thickness = weld size Butt h = 0.707 * plate thickness 0.707 * weld size 1/4 Fillet. 5 ...

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