FIELD: manufacture of small-size tubular adapters of different type materials by diffusion welding in vacuum, namely making small-size tubular zirconium-steel, titanium-steel, aluminum-steel and other adapters while performing diffusion welding along thread with diameter less than 14 mm. SUBSTANCE: method comprises steps of making in opening of outer tubular blank at least one annular turning with diameter exceeding outer diameter of thread; filling said turning with rod metal at performing diffusion welding of said rod along the whole surface of turning; making turning whose width is no less than two thread pitches. Such method provides vacuum tightness of small-size adapters even if helical microduct remains in thread groove. EFFECT: enhanced quality of adapters. 4 cl, 1 dwg, 1 ex
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