PURPOSE:To obtain a defectless joint part without melting base metals in the stage of welding the titled foil-shape metals such as heater parts of an electric furnace to be mounted to an artificial satellite to each other by melting a welding rod by the heat of the joint part heated by arc heat. CONSTITUTION:The ends of, for example, W alloy base metals 1 and 2 having the temp. lower than the m.p. of the base metals 1, 2 are heated by the arc of inert gas arc welding in the case of superposing the base metals 1, 2 and joining the same at one end thereof. The welding rod consisting of Pt or Rh, etc. having the m.p. lower than the m.p. of the metals 1, 2 is then selected and is brought into contact with the joint of the joint part 3 between the base metals 1 and 2. The welding rod is melted by the arc heat so as to flow in the brazing state into the joint of the part 3, by which the joining is completed.
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