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.

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

  Design, Specification