METHOD FOR QUALITY CONTROL OF LONGITUDINAL WELDS OF GEARS Russian patent published in 2022 - IPC G01N29/265 

FIELD: welded seams control.

SUBSTANCE: invention is intended for control of welded seams of cogwheels. The substance of the invention lies in the fact that a transducer with a transparent nozzle is used, the outer surface of which is made of a cylindrical shape and corresponds to the inner surface of the gear wheel hub interacting with it. The transducer is inserted inside the hole in the gear wheel hub, which is a tuning sample, in which one reflector hole is made at the end of the narrow part of the weld, the other is at the end of its wide part. The welding seam of the tuning sample is scanned with defocused ultrasonic beams, the signal amplitude is determined for each of the holes-reflectors of the tuning sample at the selected signal amplification value. This amplitude is the limit for the amplitude of signals reflected from product defects. Next, the product is scanned in the search mode. The weld is scanned with defocused straight and inclined beams from the initial mark to half the length of the weld, while moving the product with a given step relative to the transducer along the length of the weld and along the circumference of the inner hole of the hub. The presence or absence of reflected signals in a given section of the weld is determined, the amplitude of which is not less than the amplitude of the reflected signals from the reflector hole located in the corresponding section of the weld of the tuning sample. The gain value is changed in accordance with the gain value for the second reflector hole of the adjustment sample. The remaining part of the weld is scanned with defocused straight and inclined beams, moving the product with a given step relative to the transducer along the length of the weld and along the circumference of the inner hole of the wheel hub. The presence or absence of reflected signals in the second section of the weld is determined, the amplitude of which is not less than the limiting amplitude for the reflector hole of the tuning sample located in the corresponding section of the weld, then when signals with amplitudes equal to or exceeding the limiting amplitudes are detected in the search mode. The product is scanned in the rejection mode, for this, each section of the welded seam is scanned with direct focused beams, on which the maximum amplitude or excess of the maximum amplitude of the reflected signals is detected, then these sections are scanned with inclined focused ultrasonic beams. With the help of a flaw detector, the location and shape of a weld defect are determined.

EFFECT: improving the quality of ultrasonic testing of the welded joint of the gear wheel.

1 cl, 5 dwg