| 摘要 |
PROBLEM TO BE SOLVED: To detect, more simply and accurately than conventionally, the size and depth of a surface flaw on a welded part from a cross-section profile of the welded part. SOLUTION: The cross-section profile of the welded part is extracted to find the rate of change in the cross-section profile. Outermost left/right steep change parts of the welded part where the rate of change is large are taken as left/right toe parts. An inside bead part lying between the left/right toe parts is approximated and expressed by means of a first function by using cross-section profile data other than the change parts corresponding to flaw parts. A parent material part on the left-outside of the left toe part is approximated and expressed by means of a second function, while a base material part on the right-outside of the right toe part is approximated and expressed by means of a third function. The intersection of the first and second functions is found as a left toe point, while an intersection of the first and third functions is found as a right toe point. The left and right toe points, as divisional points, and a divisional approximated curve expressed by the first to third functions, as a reference line, are deducted from the original cross-section profile. COPYRIGHT: (C)2009,JPO&INPIT
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