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Up Topic Welding Industry / Technical Discussions / UT INSPECTION AUSTENITIC STAINLESS STEEL
- - By - Date 09-12-2000 23:03
We are looking for the best UT inspection technic and equipment to inspect austenitic stainless steel, T joint between 304L plate (2.25 inch thickness) and CF8 casting (3 inch thickness).
Parent - By - Date 09-30-2000 12:05
Dear Mr. Lessard,

Ultrasonic testing of Stainless Steels is a very tricky thing,basically due to it's very high grain size.You may have to go in for specialized probe and equipment ( i.e. with high frequency and power ) to over come attenuation problems.Further carrying out UT on a casting is not advisable.Best preferred method may be radiography.Further as you have stated to carry out UT of as rolled and cast materials you may have to establish defect standard which may be a very lengthy and costly process.Alternatively radiography is preferred and easy to do.I have stated the general difficulties encountered with these process and materials.Further you have not mentioned why you propose to do UT ? Is it the customer requirement? Code requirement?

R.MuthuRamalingam
Parent - - By G.S.Crisi (****) Date 10-02-2000 18:46
Mr. Ramalingam is right. Ultrasonic test is not advisable in a cast piece, because the results may be quite erratic and difficult to interprete. Radiography, on the other hand, is impossible, or at least quite difficult, in a T joint (Mr. Ramalingam must have overlooked that the joint was a T one). Magnetic particle is impossible on 304 or CF8 steel, because they're non-magnetic. Why don't you try penetrant liquid after each pass? It won't show porosity and other deep defects but at least will show cracks and other superficial defects.
Giovanni S. Crisi
Sao Paulo - Brazil
Parent - - By - Date 10-04-2000 12:54
Prof Crisi is right in stating that carrying out radiography is difficult.Also the technique etc. needs to be established and further complications may arise.I would like to know the fluids handled by these items.If it is refinery or petroxchemical service then it needs to be taken care.As suggested by Prof Crisi DP test after every run is very practicle.Can suggest further only if you can spell out the service for which this is intended.

R.Muthu Ramalingam
Parent - By - Date 10-05-2000 21:12
Thanks for your comments

Application is hydro power generation equipment

Regards,

Yvan
Up Topic Welding Industry / Technical Discussions / UT INSPECTION AUSTENITIC STAINLESS STEEL

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