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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.

IStress - strain diagram Strain (ε) = Stress (σ) = F A ∆L L yield ultimate (tensile) F F A L. 3 Shear Strength IIn general, material fails in shear due to distortion (at a molecular level) ICriteria for failure: • Ductile: Shear Strength ~ 0.5 Tensile Strength • Brittle: Shear Strength ~ …

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