Depending on the applications, many castings are produced to some national or international standards. The standard and or the supplementary requirements specified by the designer, customer would specify the inspection requirements. Before a casting is made, a production and quality assurance manual / procedures would have been prepared.
If you are a researcher and are trying to investigate the casting, you can try ultrasonic testing and radiography, apart from penetrant testing.
The acceptance criteria would again be dependent on the application.
Dear Swamy ,
thank you vry much....but ....
what's is the effect of UT on DUPLEX STEEL CATING?
and is there any real advantage of Phassed Arry or TOFD over conventional UT?
if u using conventional UT is there any spl transducer is req?
Well Ram at 100mm thickness I can imagine slow cooling, grain growth with all the concomitant ills (as far as UT) that entails. Scatter, beam-bending, noise requiring low frequency compression wave small diameter probe (to maximise beam-spread coverage). Your probe supplier may have wide coverage probes.
Your will need a castings expert to tell you sites of potential defects if you want to focus on those areas.
In addition to what Nigel Armstrong wrote, I would like to add that without knowing more about the casting details and the defect level that is being attempted, we cannot advise specific details. Phased Array or TOFD have their specific advantages over conventional UT but unless you are just playing around with the casting and also have access to all such instruments in house, it would be advisable to exhaust the power of conventional NDT techniques.
Unless you come up with specific details of the casting and the applicable specifications, our advice is bound to be generalistic.