Transcription of Weld Design and Specification
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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.
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 Fatigue Strength Cycles of Loading Fatigue Strength 1 1000 1,000,000 Endurance Limit Static Tensile Strength Low Cycle High Cycle Infinite Life. 6 Endurance Limit IFor Steel:
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