Supersonic inspection method for profiled bar overwelded hole welding joint

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.

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...

AI Technical Summary

Problems solved by technology

[0020] Secondly, if you detect flaws in the through-weld hole, it is not difficult to smooth the weld in the through-weld hole, but due to the small space in the through-weld hole, the conventional angle probe is too bulky to scan, or it can only be scanned in a very small area. Internal scanning, can not realize the purpose of flaw detection

If the flaw detection method of single crystal straight probe is used, since welding defects generally occur on the groove surface, it is difficult for vertical flaw detection to receive reflected echoes similar to unfused linear defects, and the quality of welds cannot be guaranteed.

[0021] In addition, the construction cycle, manpower input, material consumption and continuity of inspection have caused certain losses

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