Comparative reflector test block and method for determining weld defects in thicker plates

Abstract

The invention belongs to the technical field of building steel structure and metal welding, and particularly relates to a reference reflector test block and method for measuring weld defects of thickplates. The thickness of a test block body is the same as that of a weld base material to be tested, wherein the width of the test block body is greater than twice the width of an oblique probe; a first circular hole, a second circular hole, a first slot, a third circular hole and a second slot are formed in the test block body; and a distance between projections of central axes of the second circular hole and the third circular hole on a first surface or a second surface of the test block body satisfies an echo path length of at least twice reflection waves of the oblique probe. The referencereflector test block provided by the invention can reflect sound waves emitted by the oblique probe multiple times to measure weld defects, is convenient to operate, and can accurately detect weld defects of a to be tested surface having foreign matters unlikely to be removed.

Description

technical field [0001] The invention belongs to the technical field of building steel structures and metal welding, and in particular relates to a contrast reflector test block and a method for measuring weld defects of thicker plates. Background technique [0002] At present, the most commonly used methods for ultrasonic flaw detection of weld seams in building steel structures are direct beam method or primary reflection method. The test blocks used to make the distance-amplitude curves for ultrasonic flaw detection of welds are all used in the direct wave method. On-site welding ultrasonic testing of building steel structures is often limited by construction conditions, and the direct beam method or single reflection method cannot fully inspect the weld quality. For example, the detection surface is obstructed and difficult to remove; one detection surface is poured with concrete, and only one detection surface is used to check the quality of the weld; Under normal circ...

AI Technical Summary

Problems solved by technology

Ultrasonic inspection of on-site welding of building steel structures is often limited by construction conditions, and the direct beam method or single reflection method cannot fully inspect the weld quality

For example, the detection surface is obstructed and difficult to remove; one detection surface is poured with concrete, and only one detection surface is used to check the quality of the weld; In some cases, there is a large error in the echo energy, and the "distance-amplitude curve" of the weld ultrasonic flaw detection made by the direct wave method cannot be adapted to the single reflection method ultrasonic weld flaw detection, let alone the multiple reflection wave method

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