overlay in MR 0103
overlay in MR 0103
(OP)
I have previously qualified weld overlay as below.
Base material was A240 316 & ER 316 rod as filler metal.
the hardness survey done on weld metal(overlay) shows reading varing from 242 HV10 to 249 HV10.
Out of 20 reading on weld, only one reading shows value as 249 Hv10.
Does that mean this procedure is not complying to MR 0103 as hardness is exceeding 248 HV10 (22 HRC)
The hardness reading on base material post overaly are between 230-240 HV10 which is fine.
A quick reply is highly appreciable.
Base material was A240 316 & ER 316 rod as filler metal.
the hardness survey done on weld metal(overlay) shows reading varing from 242 HV10 to 249 HV10.
Out of 20 reading on weld, only one reading shows value as 249 Hv10.
Does that mean this procedure is not complying to MR 0103 as hardness is exceeding 248 HV10 (22 HRC)
The hardness reading on base material post overaly are between 230-240 HV10 which is fine.
A quick reply is highly appreciable.





RE: overlay in MR 0103
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: overlay in MR 0103
RE: overlay in MR 0103
These wetted parts require NACE MR0103 compliance so hardness test is done on weld overlay.
RE: overlay in MR 0103
Let’s think about this, you overlay the wrought stainless steel base metal with an austenitic stainless steel overlay that is not air hardenable, why would hardness testing be applicable for the weld overlay (base metal is justified as I explained above)? If the component is cold worked after the weld overlay, this defeats the purpose of hardness testing for the WPS.
RE: overlay in MR 0103
Refer attached file which shows the actual construction & provide your feedback.
RE: overlay in MR 0103
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: overlay in MR 0103
You appear to be plugging a tube with a most unconventional approach. That is by stuffing the tube with bare filler metal and melting the ends to form the plug. Is this the case? If so, this is not a weld overlay.
RE: overlay in MR 0103
That is the product requirement & we are using additional filler wire to melt the end face of stuffed filler wire so its similar to overlay. Now customer wants MR0103 compliance for the same.
Do you have different idea to suggest the weld procedure to this unusual product?
Sjones,
Apology for not answering your question at 1st instant but conversion was done by test lab & we did not asked them-how they convert it.
RE: overlay in MR 0103
Your current weld is not a corrosion resistant overlay; it is a pressure containing weld.
RE: overlay in MR 0103
We can not alter the mfg process as it may not provide the signal. currently its working fine with set process.
So what type of procedure qualification is required for such type of weld?
At the moment qualification per corrosion resistant weld is mutually agreed between customer & us.
RE: overlay in MR 0103
RE: overlay in MR 0103
Thanks for the feed back but the original question remains unanswered.
RE: overlay in MR 0103
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04