To prevent a tool from deformation due to a load by welding while supporting a load due to a metal bar through a support means attachably/ detachably arranged to the rear side face of the welding part of an object to be worked.
In the friction welding, e.g. a load of 1000 kg is applied to a metal bar 1 during welding in the downward direction. For this purpose, a load support mechanism 6 is arranged in the cylindrical tube 3. The support mechanism 6 is adjustable to an arbitrary length in a sliding type by hydraulic force 7, further is moved on a rail 8 arranged at a side opposite to the welding part 5 of the cylindrical tube 3 in the tangential direction. Accordingly, in the case of a long cylindrical tube 3, the rear side face of the welding part 5 is locally and stably supported. By this method, the tip part of the support mechanism 6 is brought into tight contact with the rear side face of the welding part 5, the downward load of the metal bar 1 is effectively received, welding is done with reducing deformation and buckling of the cylindrical tube 3 and without causing breakage of the metal tube 1.
OKAMURA HISANOBU
FUNYU MASAO
AOTA KINYA
WATABE KOICHI
TAKAHASHI OSAMU
ASANO KATSUHIKO
SATO AKIHIRO
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