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Technical Discussions
K Anandam
Engineering, - DyGM - Operations & Reliability
Air Liquide India Limited, India, Joined Oct 2001, 13

K Anandam

Engineering, - DyGM - Operations & Reliability
Air Liquide India Limited,
India,
Joined Oct 2001
13
06:23 Feb-21-2004
Ultrasonic Testing of Alloy Steel Casting

I am facing difficulty in a 1 Cr 1 Mo steel casting of 100 mm thick. Firstly we have encountered the total loss of gain. When the UT done after heat treatment we were able to get the echo from half the thickness only.

Now my problem is : Can I get the backwall echo from the total thickness if the heat treatment is done for one more cycle. By doing this will the hardness and other mechanical properties are affected adversely.

I would be highly obliged for helping / giving solution to the said problem.

Regards,
Anandam


 
 Reply 
 
Daniel h. Rice
Consultant, Ultrasonic Evaluation of Resistance Spot Welding
Self Employeed, USA, Joined Oct 2002, 1

Daniel h. Rice

Consultant, Ultrasonic Evaluation of Resistance Spot Welding
Self Employeed,
USA,
Joined Oct 2002
1
00:20 Feb-27-2004
Re: Ultrasonic Testing of Alloy Steel Casting
Alloy steel castings are difficult to inspect using ultrasonic method.
Although there is a standard produced by the ASTM E609 is very specific in what is required for inspection.
I have used this standard and found that it is very good, and if the code is followed closely there is no questions.
Use a 1 mhz to a 2.25 mhz transducer
Polish the surface to a mimum of 250 Micron finish,(rough machining).
use samples of the same heat treatment,of cast material. The method will work, confirm with x-ray, to establish coorelation.
----------- Start Original Message -----------
: I am facing difficulty in a 1 Cr 1 Mo steel casting of 100 mm thick. Firstly we have encountered the total loss of gain. When the UT done after heat treatment we were able to get the echo from half the thickness only.
: Now my problem is : Can I get the backwall echo from the total thickness if the heat treatment is done for one more cycle. By doing this will the hardness and other mechanical properties are affected adversely.
: I would be highly obliged for helping / giving solution to the said problem.
: Regards,
: Anandam
------------ End Original Message ------------




 
 Reply 
 
K. Anandam
Engineering, - DyGM - Operations & Reliability
Air Liquide India Limited, India, Joined Oct 2001, 13

K. Anandam

Engineering, - DyGM - Operations & Reliability
Air Liquide India Limited,
India,
Joined Oct 2001
13
02:50 Feb-28-2004
Re: Ultrasonic Testing of Alloy Steel Casting
Thank you Mr Rice for your kind help. In fact I wanted to establish UT without proof machining which in fact was really a tough job.

I have ratified the results afte proof maching using the low frequency search probes and got satisfactory results.

I once again thank for your kind help.

regards,
Anandam


----- Start Original Message -----------
: Alloy steel castings are difficult to inspect using ultrasonic method.
: Although there is a standard produced by the ASTM E609 is very specific in what is required for inspection.
: I have used this standard and found that it is very good, and if the code is followed closely there is no questions.
: Use a 1 mhz to a 2.25 mhz transducer
: Polish the surface to a mimum of 250 Micron finish,(rough machining).
: use samples of the same heat treatment,of cast material. The method will work, confirm with x-ray, to establish coorelation.
: : I am facing difficulty in a 1 Cr 1 Mo steel casting of 100 mm thick. Firstly we have encountered the total loss of gain. When the UT done after heat treatment we were able to get the echo from half the thickness only.
: : Now my problem is : Can I get the backwall echo from the total thickness if the heat treatment is done for one more cycle. By doing this will the hardness and other mechanical properties are affected adversely.
: : I would be highly obliged for helping / giving solution to the said problem.
: : Regards,
: : Anandam
------------ End Original Message ------------




 
 Reply 
 

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