Method for measuring height of lack of penetration and ultrasonic flaw detector

摘要

A method for measuring the degree of fusion involves: a step for creating a dividing pulse amplitude curve by using a probe that emits ultrasound beams; a step for scanning the probe that emits ultrasound beams at a predetermined angle on a surface that has weld beads of multiple welding specimens having different degrees of fusion and for obtaining beam path length information from the dividing pulse amplitude curve and the height of an F echo that returned to the probe after hitting the fused section of a welding site; and a step for obtaining a regression formula expressing the relationship between the beam path length information and the degree of fusion.

主权项

1. A method for measuring a height of lack of penetration in a weld, the method comprising steps of:
using a probe applying an ultrasonic beam to an object to define a dividing curve of an echo height as a reference level for evaluating a height of an F echo that is reflected by a part of lack of penetration of the weld and returned to the probe; obtaining beam path length information based on the dividing curve of the echo height and the height of the F echo obtained by moving the probe that applies the ultrasonic beam to the object at a predetermined angle to scan surfaces of a plurality of weld test samples having different heights of lack of penetration, a weld bead being disposed on the surface; and formulating a regression equation showing a relation between the beam path length information and the height of lack of penetration.