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what's the difference in A388 and A578 ultrasonic testing?

what's the difference in A388 and A578 ultrasonic testing?

what's the difference in A388 and A578 ultrasonic testing?

(OP)
Apart from the accepting criteria is there any change in  test procedure for ASTM A388 and ASTM A578.

 

RE: what's the difference in A388 and A578 ultrasonic testing?

hsemus,

A388 and A578 inspections are not similar.  While they are both based on a loss of back reflection A388 is tailored for forgings, while A578 is tailored for plate material.  A A578 inspection will consist of scanning one major plate surface, usually as a sample inspection along grid lines on 9" centers.  That is sufficient for plate material because the target flaw is pretty much limited to gross laminations.  A A388 inspection inspects 100% of two perpendicular sufaces.  Additionally, if the forging is cylindrical, based on geometry, A388 also requires an angle beam inspection.

If I needed a A578 inspection and a A388 inspection was performed, I would be alright with it.  However, if I needed a A388 inspection and a A578 inspection was performed I would not accept the material.

JR97

RE: what's the difference in A388 and A578 ultrasonic testing?

(OP)
hi ,


This test A578 is requested  for a clad pipe to check 100% for any cracks in between the clad material and base pipe .

So from your knowleadge I can extract that the procedure for A578 is different than A388. and also I belive that the A578 is more detailed testing than A388.


Thanks a lot !!
 

RE: what's the difference in A388 and A578 ultrasonic testing?

For your clad pipe situation you should require a UT test of the pipe with 100% coverage such as the one in A450.  Lack of bond will show clearly in this type of test. And so will base metal defects.
If they did A578 on a grid with straight beam then I would not take it.  Unless the grid was a fine as the wall thickness.
What did they use for a reference standard? acceptance limits?
 

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