MDMT
MDMT
(OP)
My employer sent me a few WPS and PQR's and wants me to determine rather they good for -40F MDMT or -20F MDMT. My question is Where do I have to look to determine one from the other and what is all involved with it?
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RE: MDMT
RE: MDMT
1) Are the parent materials stated in the WPS/PQR suitable for -40F or -20F MDMT (in the code you're using)?
2) Does PQR contain CVN test results? If CVN results are available, do they indicate adequate toughness at -40F or -20F MDMT?
3) Find and check datasheet for welding consumables to see if consumable manufacturer indicates suitability for low temp.
RE: MDMT
RE: MDMT
RE: MDMT
There are Code rules that specify the minimum required actual CVN test temperature for sub-size Charpys (in your case, 3/4 size), or conversely, the MDMT qualified for sub-size specimens at a given test temperature. It's a bit convoluted.
Review of WPSs / PQRs is something that I think is handled more intelligently by welders and NDE technologists / technicians than by engineers, unless one happens to be a metallurgist or welding engineer by training.
RE: MDMT
RE: MDMT
Sadly it is very clear that you do not have the skills/knowledge to perform the task that you boss has given to you. This type of work is quite specialised, and can be dangerous if not performed correctly. The skills/knowledge required is usually gained over a lengthy time period, and thus it is not appropriate to expect full training in this forum.
As a first step, I do encourage you to read the design & fabrication codes that are relevant to you.
RE: MDMT