Device for eliminating ultrasonic flaw detection blind area of steel pipe

The utility model provides a device for eliminating an ultrasonic flaw detection blind area of a steel pipe. The device comprises an extender and a coupler, one end of the extender is fixedly connected with one end of the coupler, the outer diameter of the coupler is smaller than that of the extender, the coupler is sleeved with the sealer, the sealer is located at the joint of the extender and the coupler, the surface of the coupler is provided with a plurality of sets of tensioning devices, the tensioning devices are evenly distributed in the annular direction of the coupler, and the tensioning devices are connected with the extender. When the coupler is inserted into one end of a detected steel pipe, the tensioner enables the device to be tightly and fixedly combined with the detected steel pipe, and the sealer is tightly attached to the pipe end face of the detected steel pipe. When automatic ultrasonic flaw detection is carried out on the steel pipe, pipe end blind areas caused by the coupling effect of