Laser butt welding of guide sheath of pressurized water reactor control rod guide tube（CRGT） is studied. The laser welding heat source

laser welds shrinkage of guide sheath and laser welding deformation are modeled and analyzed. The simulation technology of laser welding deformation of guide sheath is established

which provides theoretical guidance for the manufacture of laser welding of CRGT

including laser welding test and thermal cycle test

macroscopic appearance of weld

residual stress test

heat source model establishment and parameter determination

laser weld shrinkage model and welding deformation prediction. Finally

the stable laser welding parameters are obtained

should be tested using a φ10.26 mm drop bar gauge can go though the CRGT freely in four positions of 0°

90°

180°

270° with the speed of 4～5 m/min

and the friction force is less than 9.07 kg.