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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol.4 (1972) No.3 ■■■■■■■■■■■■■■■■■■■ |
| 溶接欠陥の超音波斜角探傷による判定方法 Ultra Sonic Testing for Defects in Weldings 木村 勝美(Katsumi Kimura) 安部 敬(Takashi Abe) 森 達哉(Tatsuya Mori) 山口 脩(Osamu Yamaguchi) 森 裕(Hiroshi Mori) |
| 要旨 : 各種板厚の突合わせ溶接試験片に実在欠陥に近い人工欠陥（方向性，非方向性）を内在させ，これを各種条件で超音波探傷して，欠陥実長と超音波波形からの推定寸法の関係を求めた。欠陥存在探知についてはＸ線よりすぐれていることが立証され，また，欠陥長さについて，指示長，最大エコー高さ，ビーム路程などを用いた，かなり正確な推定式を求めることができた。 |
| Synopsis : Substituting for X-ray examination, the ultrasonic inspection has grown up to be a common and favourable method for the inspection of weld bead in recent few years, but in fact the method still contains some problems not clearly solved. In this study, these problems have been examine to find out optimum testing conditions and acceptance standards. A number of testpieces containing various kinds of defects, not of usual drill hole type but of natural type such as found in actual weld bead, have been prepared by butt welding techniques. By X-ray examination, ultrasonic testing and final macro-etched test of sliced pieces, the correlation of actual length of defect and estimated length presupposed from the echo in ultrasonic testing have been examined. It has been concluded that as far as the ability of detecting the existence of defect is concerned, the ultrasonic testing is superior to the X-ray examination, and that the actual length of defect can be estimated in high accuracy by using scanned length showing flaw echo. |
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