residual stress in welding
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Transcript of residual stress in welding
Residual Stresses In Weld Component
Jitendra malavNo:09
Residual Stressesstresses that would exist in a body if all
external loads were removed. They are sometimes called internal stressesCaused by to non uniform temperature in
welding
Formation of Residual stressesResulting for mismatch . Produced by unevenly distributed non elastic
strain Thermal stress and resulting residual stressResidual stress and reaction stress in
weldment
Residual Stress in weldHeat flows from the weld area and causing
the joint area to expandThermal expansion and contraction due to
welding can leave behind permanent stressHigher heat input welds are more prone to
residual stress Increased restraint can decrease distortion
but can result in higher residual stress
Residual tensile stresses exist in the weld metal and the adjacent base metal
While residual compressive stresses existing the areas farther away from the weld metal
Effect of residual stressesDecrease the fracture strength.Reduce buckling strength. Compressive residual stress increases fatigue
strengthIn hostile environment residual stress can
causes cracking in matel without any applied load.
Reducing residual stressesSelecting appropriate processes, procedures,
welding sequence and fixturing. Selecting best method for stress reliving and
removing distortion. Selecting design detail and materials to
minimize the effect of residual stresses
Measurement of residual stressesStress-relaxation techniquesX-ray diffraction techniquesTechniques using stress-sensitive propertiesCracking techniques
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