Laser Cladding Remanufacturing Technology of Cast Iron Cylinder Head and Its Quality Evaluation

Abstract

On account of cracks generating in the cast iron cylinder heads,a remanufacturing technique of cylinder heads by means of laser cladding is investigated in this paper.A bow wave nondestructive examination is used to accurately measure the depth and position of cracks in the cylinder heads.Results show:with the increasing of cracks depth,signals of bow wave rises as an exponential function.Therefore,cracks depth can be measured by a fitting formula of bow wave signals.A complete procedure of laser cladding remanufacturing comprises pretreatment,laser forming and stress relieving after remanufacturing.there are no cracks existed in the interior or surface of build-up cladding,meanwhile,the porosity is feeble,and comprehensive evaluation shows an excellent remanufacturing quality for cylinder heads.