Abstract
In general use, electron beam welding has been executed without a filler wire. It is recommendable, however, to use the filler wire in such case as the improvement of the property of the weld metal or filling up large joint gap. In the former case, it is indispensable that the filler metal is distributed uniformly throughout the weld metal. Then, the authors investigated effects of several welding parameters on the distribution of the filler metal and discussed the selection of the welding conditions to obtain the uniform distribution of the filler metal. The results obtained are as follows.
1) In order to feed the filler metal into the root portion of weld bead, it is recommendable to select the high welding speed and the defocused condition of the beam so as the beam cavity to be opened widely at the surface.
2) As the heat input becomes larger, the filler metal is apt to be distributed uniformly in the weld metal.
3) The transverse beam oscillation at low frequency is effective for mixing the molten metal.
4) When the full penetration welding was carried out with the filler wire, the filler metal was hardly contained in the back side bead.
