Guide wheel and internal welding machine

The utility model discloses a guide wheel and an internal welding machine, the guide wheel comprises a wheel body installed in a wheel carrier through a wheel shaft and used for providing guidance, and a sliding plate arranged on at least one side of the wheel carrier and used for adjusting the angle of the wheel body, the sliding plate is provided with a plurality of long holes, and the sliding plate is fixed on the outer side of the wheel carrier through fixing bolts penetrating through the long holes. The adjusting bolt is arranged on the wheel carrier and is used for jacking the sliding plate and enabling the sliding plate to transversely move relative to the wheel carrier when the fixing bolt is unscrewed; aligning bearings which are coaxially arranged are fixedly mounted on the sliding plate and the other side of the wheel carrier, and the aligning bearings are mounted on the wheel shaft in a sleeving manner; the internal welding machine comprises guide wheels, a front flange and a rear flange, and the