发明名称 |
Inspecting rolled prods. for surface defects - where prods. are coated with indicator soln. and subjected to high frequency induction heating which reveals the defects |
摘要 |
<p>The surface of the rolled prod. is coated with a substance (A) forming a background for a second substance (B) which changes colour when heated. High frequency heating is then used so that defects on or near the surface of the prod. cause a thermochemical change in substance (B) altering its colour so the defects are clearly visible. When substance (B) is used as a soln., drying is pref. used for coating (B) at a temp. below that causing its colour to change. Substances (A,B) may alternatively be combined in an aq. colloidal suspension, contg. 30-160 g/l KOH in soln. and 5-20 g/l soluble potato starch. Used for inspection of ingots and slabs which still have a scaled surface due to hot rolling, or for examining profiles, e.g. rails or girders. The invention can be used without prior surface treatment of the rolled prods.</p> |
申请公布号 |
FR2426903(A1) |
申请公布日期 |
1979.12.21 |
申请号 |
FR19780015588 |
申请日期 |
1978.05.25 |
申请人 |
INSTITUT METALLURGII |
发明人 |
E. F. GAVRILIN, A. N. BELOKUR, A. L. DAIKER, V. V. BASOV, A. E. KONASH ET N. F. MOSKVIN;BELOKUR A N;DAIKER A L;BASOV V V;KONASH A E;MOSKVIN N F |
分类号 |
G01N25/72;(IPC1-7):01N25/72 |
主分类号 |
G01N25/72 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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