Hard Stamping of Vessel Steel Plate
Hard Stamping of Vessel Steel Plate
(OP)
Hi Guys,
We have a couple of vessels manufactured. One of the requirements is low stress stamping of the plates. All the welds are ground flush because of cyclic service and it does not make sense to have those solid stamps punched in the plate surface while we remove all the traces of undercut. The fabricator does not want to remove the stamping since they reckon hardstamping used by them and mill is low stress. Can you provide some guidance as what should be considered low stress stamping? In my opinion only round dot matrix stamping meets those requirements for our service.
Any papers or standards addressing that issue?
Thanks
We have a couple of vessels manufactured. One of the requirements is low stress stamping of the plates. All the welds are ground flush because of cyclic service and it does not make sense to have those solid stamps punched in the plate surface while we remove all the traces of undercut. The fabricator does not want to remove the stamping since they reckon hardstamping used by them and mill is low stress. Can you provide some guidance as what should be considered low stress stamping? In my opinion only round dot matrix stamping meets those requirements for our service.
Any papers or standards addressing that issue?
Thanks
Putting Human Factor Back in Engineering





RE: Hard Stamping of Vessel Steel Plate
Unless the requirement is quantified it would be difficult to verify the assertion.
http://www.welding-advisers.com/
RE: Hard Stamping of Vessel Steel Plate
I am not able to provide this definition and that is why I am searching and asking those questions to my esteemed colleagues.
Putting Human Factor Back in Engineering
RE: Hard Stamping of Vessel Steel Plate
Never had a problem with any of our pressure retaining items that were low stress stamped from years ago - welder symbols and ASME Code stamps. The stamped locations are not typically located in high stress areas of the component. Perhaps instead of trying to find papers on this issue, experience among users might provide your answer.
RE: Hard Stamping of Vessel Steel Plate
New spec clearly defines rounded dot matrix.
And yes, the area I am talking about is a high stress area subject to thermal cyclic stress.
I was directed to ASME Section III Division 1, para NA-3766.6, subparagraph (b) 2.
I read the book and did not find the parqagraph quoted. Many stamp suppliers/manufacturers quote compliance of their product that paragraph without even assuring it is still there.
Do you have any publications, papers on this subject?
Putting Human Factor Back in Engineering
RE: Hard Stamping of Vessel Steel Plate
http://ww
"There are two types of low stress dies; blunt-nose continuous or blunt-nosed interrupted dot die stamps (ie dies that are manufactured to produce impressions that are rounded at the base of the impression)."
What I found most interesting is the allowed depth limit of the impression is 1/32". Minimum face radii as a function of character size are also provided.
RE: Hard Stamping of Vessel Steel Plate
What worries me is that my fabricators did not bother to investigate the issue to the same depth.
BTW: stamp depth was the reason why I started my quest on hard stamping. Approximate depth was over 1mm (0.04"). I rejected the stamping based on engineering practice more than anything else.
Thanks again and Merry Christmas, Happy Hanukah and season geatings.
Putting Human Factor Back in Engineering