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residual stress in welding
- 1. Jitendra malav No:09
- 2. Residual Stresses stressesthat would exist in a body if all external loads were removed. They are sometimes called internal stresses Caused by to non uniform temperature in welding
- 3. Formation of Residualstresses Resulting for mismatch . Produced by unevenly distributed non elastic strain Thermal stress and resulting residual stress Residual stress and reaction stress in weldment
- 5. Residual Stress inweld Heat flows from the weld area and causing the joint area to expand Thermal expansion and contraction due to welding can leave behind permanent stress Higher heat input welds are more prone to residual stress Increased restraint can decrease distortion but can result in higher residual stress
- 6. Residual tensilestresses exist in the weld metal and the adjacent base metal While residual compressive stresses existing the areas farther away from the weld metal
- 10. Effect of residualstresses Decrease the fracture strength. Reduce buckling strength. Compressive residual stress increases fatigue strength In hostile environment residual stress can causes cracking in matel without any applied load.
- 12. Reducing residual stresses Selecting 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
- 13. Measurement of residualstresses Stress-relaxation techniques X-ray diffraction techniques Techniques using stress-sensitive properties Cracking techniques
- 14.