ASTM E192 specification level to chose

[pparent]

We are purchasing small precise investment casting (0.5" x 1" or 2" in size) and need to specifiy acceptance criterias for x-rays. We've been specifying E446 for a while but now realizing this was too permissive. I understand I would probably need to specify E192 but which level? Any source or documentation I could use that would describe the type of defects to expect from a level 1 or level 5? I am not interested into buying and trying to interpret a list of reference x-ray charts...

We are producing safety critical systems in the rail industry and specifying parts for vendors across North America.

Thanks

PP

 

[metengr]

I understand I would probably need to specify E192 but which level? Any source or documentation I could use that would describe the type of defects to expect from a level 1 or level 5? I am not interested into buying and trying to interpret a list of reference x-ray charts...

You do need to review reference radiographs to decide on a particular severity level and type of defect. This is up to the designer, it is not something that is cookbook.

 

[arunmrao]

Severity of defects that can be tolerated is normally specified by the designer. Reference standards are guides to define and cannot be done away with,especially whenever a dispute arises.

Ofcourse as you know very well, placing the requirement as NSD (No Significant Defects) or Level 1 ,the cost of the component goes up .It is then a choice between cost and service requirement that needs to be addressed to.