Numerical Simulation on Welding Residual Stress of P91 Pipe

The universal problem of Cr-Mo heat-resistant steel is type Ⅳcracking failure in heat affected zone(HAZ) of welded joint.The level of welding residual stress plays a remarkable role.A coupling calculation method for welding stress was developed by ABAQUS code.The residual stress for welded joint of P91 steel was simulated by the method above.The results show that the radial and axial residual stress are tensile stress.The maximal residual stress concentrates in the vicinity of HAZ adjacent to base metal.The position of welding resichual stress is in good agreement with the generation position of type Ⅳ cracking.