A rail-supporting channel to be welded with friction stir welding method and a welding apparatus

The present invention discloses a rail-supporting channel to be welded with friction stir welding method and welding apparatus, comprising a table for supporting and moving the pad in the track to be welded, the table is provided with fixing means to be fixed to the welded tube to be welded provided above the welding seam to be welded tube against the shoulder, the shoulder of the bottom planar stirred needle through the shaft shoulder, shoulder close to the track to be welded by a nut, is provided with an inner wall of the guide rail to be welded tube , by locking means locking the guide rail to be welded in the track, the pad moves along the guide rail, the needle passes through the shoulder was stirred until the welded tube, a mobile spacer, the spacer connected to the mobile pin is stirred by the rotation means, welding, stirring pin and the shaft shoulder high speed rotation, but the mobile pad does not rotate. A rail-supporting channel of the present invention to be welded and a welding method for friction welding apparatus with stirring, by moving the top of the pad to be in close contact tightly welded tube, weld cooling functions, improve the welding quality.