Study on laser cladding hard alloy with electromagnetic stirring

In the processing of cladding,the difference of density and character of compositions leads to component segregation,and the cracks in the laser cladding coating are mainly related to the component segregation.In order to decrease the defects,an electromagnetic stirring equipment for laser cladding has been designed and made.Electromagnetic stirring has been used in laser cladding processing.Laser cladding hard alloy with electromagnetic stirring is studied.The results show that electromagnetic stirring affect not only the macro-appearance,but also the micro-structure of the coating.It can refine the WC structure and make them homogeneous,and also refine the branch crystal in transition region of the coating.