Multi-dimensional probe holder for ultrasonic flaw detection of weld joint on spiral welded pipe

The invention relates to the field of ultrasonic nondestructive test, particularly to a multi-dimensional probe holder for ultrasonic test of a weld joint on a spiral welded pipe. The invention is characterized in that: the multi-dimensional probe holder comprises a connecting seat, a horizontal beam, a flexible main shaft and probe clamping frames, wherein the connecting seat is arranged on the horizontal beam in a centering manner; a lifting cylinder is arranged in the groove-shaped connecting seat; the end part of the lifting cylinder is connected with the horizontal beam; the flexible main shaft is formed in a manner that more than three main shaft joints are hinged in sequence; the flexible main shaft is arranged below the horizontal beam and is connected with the horizontal beam by a central joint; adjusting screw rods are also arranged among the horizontal beam and other main shaft joints of the flexible main shaft; a probe clamping frame is arranged below each main shaft joint; and swing pins are arranged between the main shaft joints and the probe clamping frames. Compared with the prior art, the invention has the beneficial effects that: 1) the probe and the weld joint can be guaranteed to be fully bridged by the flexible main shaft, so that the test error is reduced; 2) the flexible main shaft takes a side swing joint as the first joint thereof, so that the probe and the weld joint can be bridged better; 3) the horizontal beam and the flexible main shaft are arranged in parallel up and down, so that stable shape and convenient regulation and control are realized.