SU1677602A1 - Reference specimen for magnetic tape non-destructive testing - Google Patents

Abstract

The invention relates to non-destructive testing and can be used for magnetic inspection of the quality of products made of ferromagnetic materials. The aim of the invention is to expand the field of use by imitating defects of the form of non-prowers located at different distances from the plane of symmetry of the seam. The control sample is made of two welded plates in such a way that, on the one hand, the joint of the welded plates coincides with the plane of symmetry of the seam. on the other hand it is located at the edge of the weld. The sample obtained in this way contains defects of the type of incomplete welding, displaced relative to the plane of symmetry of the weld, which corresponds to real defects that occur, for example, in the process of automatic welding. 1 il.

Description

The invention relates to non-destructive testing of welded joints by a magnetographic method and can be used to simulate defects in the type of incomplete welds.

The purpose of the invention is to expand the field of use due to imitation of defects in the form of incomplete welding located at different distances from the plane of symmetry of the weld.

The drawing shows a control sample.

The sample consists of two plates 1,2, connected by a weld 3, the axis of symmetry of which is offset relative to the junction of 4 plates. The weld is made in such a way that on one side the junction of the plates coincides with the axis of symmetry of the seam, and on the other, the junction of the plates is located at the edge of the weld at a distance b / 2 from the axis of symmetry, where b is the width of the weld.

The control sample allows you to simulate real defects when, for example, the welding head is displaced relative to the joint axis. The magnitude of the actual defect depends on the depth of penetration of the base metal, ultimately, with a stable welding mode, on the magnitude of the displacement of the welding arc relative to the joint. When inspecting welded joints as the defect shifts from the plane of symmetry to the weld edge, the defect field will change due to non-uniformity of the magnetization of the weld. In addition, the defect field at the weld edge will be superimposed on the stray field due to the reinforcement roller.

Therefore, the detection of defects displaced relative to the plane of symmetry will differ from that of the capacity of the defect located in the plane of symmetry of the seam. A specimen thus fabricated with displaced hang defects

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The lack of penetration is used to check and adjust the magnetographic flaw detectors.

Example. Make a control sample. For this, a weld is preliminarily performed at the nominal welding mode and the width of the weld reinforcement roller (L 20 mm) is measured. Then two plates measuring 120 x 100 x 6 mm are attached to each other with long sides. Tacking the plates and installing the process plates and welding so. so that from one edge of the plates the plane of symmetry of the seam coincides with the butt, and on the other side of the distance 10 mm from the butt.

When a defect is detected by a magnetographic method, its position in the weld is preliminarily determined by the location of the signal from the defect between the signals from the weld bead at its edges. Compare the magnitude of the defect, determined using the control sample in the appropriate place of the seam of the control sample, with the magnitude of the real defect. Difference

did not exceed 15% of the magnitude of the real defect.

The use of a control sample allows to simulate defects of the type of incomplete welding, displaced relative to the plane of symmetry of the weld, close to defects that occur in real conditions, which allows for more accurate checking and adjustment of the magnetographic flaw detectors.

Claims (1)

Claims A test sample for magnetic-tape testing of welds containing two plates joined by a weld, characterized in that, in order to broaden the field of use by imitating defects of the form of wires, located at different distances from the plane of symmetry of the weld, the weld is made in such a way that on one side the junction of the plates coincides with the plane of symmetry of the seam, and on the opposite side the junction of the plates is located at the edge of the weld.