Abstract: In order to realize the manufacture for neutral bus device of nuclear power half speed turbogenerator,investigation of assembling,welding and brazing technics for neutral bus device was carried out.By utilizing technical means such as using φ1.6 mm ERCu（AWS A5.7）welding wire,CJ301 welding flux and 40% Ar+60% He protecting gas,setting the preheating temperature no lower than 600 ℃,and laying graphite backing on the back side of weld seams,completed the gas metal arc welding of the neutral bus device cover which is made of copper successfully,realized one-side welding with back formation.By using different filler metals and different brazing flux,designing reasonable assistant tools,using flame brazing technology,obtained reliable brazing joints for copper tube and stainless steel tube,copper tube and ueutral bus device cover.The quality of manufactured neutral bus device is up to the design requirement.