Optimization of CMT cladding process path for boiler water-cooled wall tubes
In order to provide effective repair and rust prevention treatment for hot surface pipe of utility boilers,and to ensure safe operation of the equipment,cold metal transfer(CMT)cladding process is adopted for water-cooled wall tubes.Four cladding process paths are designed,and the reliability of the numerical simulation data is verified through ANSYS numerical simulation and the CMT cladding experimental platform.Comparison based on the process developed in the simulation process shows that,design of the CMT heat source function has a higher degree of agreement in characterizing the temperature field than the conventional arc heat source.Along the material thickness direction,the change rule of the temperature gradient is consistent with the actual morphology of the specimen cross-section.In the case of the same heat input,the average temperature of the cross-melting path is 30℃lower than that of the sequential melting path,the thermal effect of the cross-melting path on the substrate is smaller,and the stress is 22.0 MPa lower.Pipe deformation reduces by 0.18 mm in the cross-over reverse welding path compared with that in the sequential reverse welding path.Comprehensively considering the effects of the residual stresses and the deformations,the cross-reversed melting path is the optimal process route for CMT.
cold metal transferpath optimizationtemperature fieldresidual stressnumerical simulation
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