METHOD FOR QUALITY CONTROL OF WELDED JOINT OF RAIL JOINT Russian patent published in 2019 - IPC G01N29/14 G01N29/04 

FIELD: methods and devices for metal processing.

SUBSTANCE: use: for quality control of welded joint of rail joint. Summary of invention consists in the fact that quality control of welded seam for the first time is carried out by acoustic emission (AE) method with application of temperature gradient as loading action at weld seam cooling and second time by ultrasonic inspection method, at that, quality control of welded joint of rail joint is carried out at stage of heat treatment of welded joints in process of air-water cooling of welded seam, simultaneously controlling the welded joint cooling temperature, wherein the monitoring sensors are mounted on the rail head, recording the AE total count, the AE count rate, amplitude distribution of AE signals, formation of a martensite structure in a welded seam of a rail joint is evaluated based on analysis of obtained parameters of acoustic emission control, conclusion on suitability of a welded seam of a rail joint is made with allowance for ultrasonic control results.

EFFECT: technical result is possibility of detecting zones of brittle hardening structures (martensite) in welded seam of rail head.

1 cl, 2 dwg, 1 tbl