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Weld Design and Specification - udel.edu

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 : Shear Strength ~ Tensile StrengthIWeld strength analysis is generally based on Shear Strength4 Static Strength of WeldsStatic Strength of WeldsFFNormal = Shear = Fw * hFw * h2 FFF1/875o3/81/4 Max Normal = Max Shear = * * hButtFilleth = throat size!

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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  Design, Specification, Plate, Failure, Brittle, Weld, Weld design and specification

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