The invention provides a
welding joint conveying device on the inner surface of a
piping. The length of a fixing part can be adjusted according to the size of the
piping, and the device does not need to be remanufactured according to the size of the
piping, so the cost can be lowered; and the device is not related with a manufacturing factory of
welding joints, so the installation becomes easy, and the using range can be greatly enlarged. The device comprises a linkage chuck used as a main body, a fixing part for fixing the main body inside the piping, a rotary
drive motor for generating power required by
welding the piping along the circumferential direction, a rotary drive part for transferring the power of the rotary
drive motor to a rotary cover, the rotary cover rotating along the circumferential direction of the piping, a rotary part mounting rod connected with the rotary cover, a back-and-forth conveying motor for generating power required by welding the piping along the lengthdirection, a drive part for transferring the power of the back-and-forth conveying motor to the length direction of a
welding joint part, the
welding joint part moving along the length direction of the piping, a
motor controller, a
wireless camera, a
wireless receiving part, a camera controller, and a display part.