CSWIP 3.1 RESIDUAL STRESSES AND DISTORTION

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Key notes:

How many types (typical) ?

  • Transverse
  • Short-transverse (Non-uniform contraction through thickness)
  • Longitudinal

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6 types in details

Thermal expansion is the greatest affecting factor (Alu, SS)

“Yield strength – Y.S direct proportion with Residual Stress BUT Y.S is inverse proportion with Distortion (Because of elastic state/thermal expansion)“. 

v1
As original properties, Y.S higher mean restraint is higher

Neutral axis welding for distortion prevention

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Strong-backing method used for Thicker plate only.

Back step/Skip welding method used for Thinner plate

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