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Weld Design and Specification

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1Weld 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 2Factors 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)FFAL3Shear StrengthShear StrengthIIn general, material fails in shear due to distortion (at a molecular level)ICriteria for failure: Ductile: Shear Strength ~ Tensile Strength Brittle.

2 Factors in Weld Design IStrength (static and/or fatigue) IMaterial and the effects of heating ICost IDistortion IResidual Stresses IEasy to Weld Static Strength IStress - strain diagram Strain (ε) = Stress (σ)F A ∆L L yield ultimate (tensile) F F A L

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