When I check the hardness of these welds. There is a recommendation for this, as long as the hardness of the HAZ is less than 248HV10, it is fine?. Is this correct if I use E(R) NiCrMo-3
I mean after the above advice I would opt to use only Er/Enicrmo-3 for the entire weld. Preheat or PWHT for the entire weld by Er/Enicrmo-3.
I want to do some research before I hire a welder. Because I really don't know any qualified welders around here.
Dear Sir,
Thank you
About PWHT and preheat, ASME B31.3 advise that PWHT is necessary but UCS 56 say that Once you preheat the weld, you won't need to PWHT.
and i plan to just heat it to dry the surface and keep the heat between the weld layers around 95 degree C, is that correct ?
Dear sir, thank you for giving me advices
if there is any information or documentation on this issue, all will be considered. if not, Ernicrmo-3 will be used, but it is really too expensive.
Do you have any documentation on this issue that I can refer to?
Dear sir,
In the recommendations I only see mention that if the working temperature is above 700 degrees F then 309 cannot be used. Also I can't find any other document that talks about using 309 as a butter layer between ErnicrMo-3 and 7018.
as for other requirements i cant find any mention...
It is argued that the use of e309 and 7018 should only be done if welding from both sides is possible.
Will weld CS layer first with 7018 then weld e309 and finish by welding incoloy 825 layer so i'm a little confused
Hello All
When access from both sides are not possible, like welding clad pipe to clad pipe, generally the full joint is welded with the high alloy. (Clad pipe is CS(ASTM A234 WPB) + Incoloy 825). In this case Er Ni CR Mo-3 and E NiCrMo-3 is used. This has been my experience.
Now a contractor...
