Short-pipe radial fillet weld ultrasonic flaw detection method

Abstract

The invention provides a short-pipe radial fillet weld ultrasonic flaw detection method, which does not waste forge pieces, does not generate the secondary process cost, and has high whole efficiency, short production period and low cost. The invention comprises a boiler barrel and a short pipe, wherein, the short pipe is connected with the boiler barrel through welding the fillet weld. The invention is characterized in that oblique probes with different refraction angles are arranged on the excircle surface of the short pipe; ultrasonic wave ejected by the oblique probe is aligned with the fillet weld and the weld cross section of the short pipe; after moving to a certain distance, each probe of the oblique probe ensures that the ultrasonic wave thereof covers the whole fillet weld and the weld cross section of the short pipe; the movable range of each probe of the oblique probe is within the excircle surface of a radial straight pipe of the short pipe; the inner surface of the boiler barrel is provided with a straight probe; the ultrasonic wave ejected by the straight probe is aligned with the fillet weld and the weld cross section of the boiler barrel; and after moving to a certain distance, each probe of the straight probe ensures that the ultrasonic wave of the probe covers the whole fillet weld and the weld cross section of the boiler barrel.

Description

technical field [0001] The invention relates to the field of flaw detection in boiler manufacturing, in particular to an ultrasonic flaw detection method for the fillet weld of a radial pipe seat of a short pipe. Background technique [0002] In the ultra-high pressure boiler drum radial tube seat fillet weld ultrasonic flaw detection, the Φ 235×55, Φ 135×35.75, Φ 205×52.5, Φ 300×65, Φ 130×33.25, Φ 270×65.1, Φ In the inspection of 405×85.55 specification, there are different forging pipe walls and thicknesses, large changes in the inspection surface, and short radial straight sections (60mm-120mm). For UT100% inspection of fillet welds, the moving distance of the probe must be maintained (P =2.5TK) to make the sound beam cover the entire weld section and achieve 100% ultrasonic detection. [0003] The existing ultrasonic flaw detection method for the short tube of the fillet weld of the radial tube seat is as follows: according to the requirements of the drawing...

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Problems solved by technology

[0003]The existing ultrasonic flaw detection method for the short pipe of the fillet weld of the radial pipe seat is as follows: according to the requirements of the drawing, the process margin is increased when the forging is blanked by the process, etc. After passing the inspection, it is cut off by machining, and finally the requirements of the design drawings are maintained. After adopting this method, the forging material waste is large, and the secondary processing cost is high and the processing is difficult; resulting in low overall efficiency, long production cycle and high cost.

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