Supersonic inspection method for profiled bar overwelded hole welding joint

A through-hole and ultrasonic technology, which is applied to the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve the problems of small through-hole space, difficulty in receiving reflected echoes, and inability to ensure the quality of welds, reducing construction steps. , save time and raw materials, improve the effect of weld quality
CN101464428AActive Publication Date: 2009-06-24CHINA NAT OFFSHORE OIL CORP +4
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA NAT OFFSHORE OIL CORP
Publication Date
2009-06-24

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Abstract

The invention discloses a method for subjecting overwelding holes of profile steel to ultrasonic testing. The method comprises the following steps: (1) welding with a backing plate, that is, marking the position in which H-steel needs to be arranged on a deck, and carrying out the backing plate welding; (2) cleaning and polishing a test surface; (3) polishing inside welds in the overwelding holes; (4) carrying out single crystal inspection, that is, inspecting butt welds of a flange plate with a transverse wave single crystal angle probe; (5) carrying out flaw detection with a double-crystal probe, that is, inspecting welds in the overwelding holes with a longitudinal wave double-crystal angle probe; and (6) carrying out the follow-up step, that is, ending the operation if no quality problem emerges, and repairing and rewelding in case of the presence of quality problems. The invention skips procedures such as skylight construction, overturning and back chipping. In addition, the double-crystal probe can scan within a larger range by moving within a small range. The flaw detection in the overwelding holes has no bad influences on the surfaces of welds.
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Description

technical field

[0001] The invention relates to an ultrasonic flaw detection method for welded seams of shaped steel, in particular to an ultrasonic flaw detected method for welded seams where shaped steel passes through welding holes. Background technique

[0002] The ultrasonic flaw detection method of the welded seam of section steel in the prior art has been or is being popularized, and the operation process of inspecting the weld seam in the through-welding hole is being further studied, such as Figures 1 to 3 The welding of the I-beam blocks shown includes the welding between the ends of the I-beam 4 and the welding of the ends of the I-beam 4 and the sides of the I-beam 4. There are I-beams with the same size and different sizes. Steel 4 is welded, and the formed weld 5 includes the butt weld of the flange 7 and the flange 7, the butt weld 5 of the web 6 and the web 6, and also includes the flange 7 and the web 6, and the web 6 and the web 6 The fillet weld 5 has a t...

Claims

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