Numerical model of analyzing temperature field for propellant tank with moving resource electronbeam welding (EBW) was set up

with which the heat source of EBW was described by cone source and the latent heat of melting was determined by means of equivalent specific heat. Time evolutions of temperature distribution on tank

molten pool shape and size were obtained.Results showed that

the error ratio of temperature between calculation and measurement was less than 10%. During the later welding process

the pure cupper radiator plate installed on the outer surface of the tank could be used to reduce the temperature of the diaphragm of propellant tank from 503K to lower than 364K

avoiding the structure damage due to high temperature. The calculation method and heat radiation figuration can also be adopted to other products welding process.