PURPOSE:To have the brazing work carried out effeciently in the process of assembling a magnetron by sticking the brazing material beforehand to the place to be fused and also to reduce the production cost well to be applied to an electronic range etc. by utilizing low-priced ruthenium and molybdenum as a brazing material. CONSTITUTION:Brazing of an end hat proper with a lead rod 4 can be carried out, by a method wherein another brazing material 5' in addition to a ring- shaped brazing material 5 is kept intact on the enhat 5 then heated and the space between the lead rod 4 and a fitting inlet 1d installed on a cylindrical part 1c is impregnated with molten brazing material, hence D1 is 8.5mm., D2 is 4.07mm., d is 1.55mm., H is 2.0mm., t is 0.5mm., and t' is 1.5mm.. Also, with respect to the dimension of the ring-shaped brazing material, the outside diameter is 8mm., the inside diameter is 4.3mm. and the thickness is 0.3mm., and it is stuck to the endhat proper 1a made of molybdenum by means of vinyl-system adhesive.
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