CONTROL METHOD OF HEAT-AFFECTED ZONE OF WELD JOINTS Russian patent published in 2014 - IPC G01N29/14 

FIELD: metallurgy.

SUBSTANCE: weld joint is subject to thermal action; acoustic emission signals are recorded, and the quality of the weld joint is evaluated as per their parameters. The acoustic emission signals are initiated by a local thermal action in turn at control points located in a line perpendicular to a weld; relationship of parameters of these signals is built for each control point from its distance to the weld, and the size of a heat-affected zone is evaluated as per the specified relationship as the distance between the control points that are maximum remote from the weld, at which the value of total energy of the acoustic signals is lower than in the parent (not subjected to thermal effect during welding) metal of the weld joint.

EFFECT: providing a possibility of evaluation of sizes of a heat-effected zone and control of a structural state of metal in this zone of weld joints.

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