Study on wire-fed laser cladding of the roller with circular runout
To solve the problem that circular runout affects repair of rollers with wire-fed laser cladding,theoretical analysis of effects of runout on location variation between the cladding head and the workpiece surface as well as the laser cladding process was carried out,and effects of laser power and spot diameter on repair of the circularly-runout roller were studied experimentally.The results show that the low height clad channel exists in laser cladding with wire pointing at leading edge of the melting pool,a large number of burrs and undercuts appear in laser cladding with wire pointing at the trailing edge of the melting pool,but the surface morphology of the clad bead is relatively good in laser cladding with wire pointing at the center of the melting pool.Under condition of laser spot with small diameter and low power,pores and burrs will also occur in laser cladding with wire pointing at the center of the melting pool,while increasing laser power and laser spot diameter can reduce this phenomenon in laser cladding.When the circular runout error is not larger than 0.6 mm,at laser power of 2 400 W and diameter of 6.5 mm of red guiding light spot on the workpiece surface,defects almost don't appear in wire-fed laser cladding.When the small overlap rate is applied during multilayered clad tests,the circular runout will affect the actual forming position of the first bead.However,this impact is not evident when the overlap rate is 40%.
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