316 SS pipe welding to carbon steel
316 SS pipe welding to carbon steel
(OP)
I'm posting a duplicate query here as well just in case you guys don't visit the "piping and fluid mechanics engineering" forum. Someone there suggested a welding forum, but I don't think there is one of those. Anyway...
Is it OK/common practice to weld 316L SS pipe to standard sch 40 carbon steel pipe or A36 steel plate? Are there any type of special welding materials/electrodes or special prep procedures that I should call out on the drawings/in specs?
Also, is there a dielectric issue with these dissimilar metals? I don't have water in the system. The application is more of a stack instrument test port nozzle.
And finally, if flanging/gasketing is employed, doesn't the gasket serve to dielectrically separate the two materials or do I need something else since the bolting bridges the materials?
Thanks in advance.
Is it OK/common practice to weld 316L SS pipe to standard sch 40 carbon steel pipe or A36 steel plate? Are there any type of special welding materials/electrodes or special prep procedures that I should call out on the drawings/in specs?
Also, is there a dielectric issue with these dissimilar metals? I don't have water in the system. The application is more of a stack instrument test port nozzle.
And finally, if flanging/gasketing is employed, doesn't the gasket serve to dielectrically separate the two materials or do I need something else since the bolting bridges the materials?
Thanks in advance.





RE: 316 SS pipe welding to carbon steel
If corrosion is not an issue, the filler metal for joining the dissimlar metals is either 309 or Inconel (if the joint is exposed to elevated temeprature service).
I would use an AWS or ASME Section IX qualified welding procedure. The weld prep will depend on load conditions - you can fillet weld or use a partial penetration groove weld. Nondestructive testing (using Liquid penetrant) should be performed after the welding
RE: 316 SS pipe welding to carbon steel
cheers,
gr2vessels
RE: 316 SS pipe welding to carbon steel
Look also at "welding of stainless steel and other joining methods" NIDI pub no 9002, there is a chap on dissimilar welding.
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Regards
S.
http://www.corrosionist.com
RE: 316 SS pipe welding to carbon steel
This practice only applies IF PWHT is required for the CS. Otherwise, I see no benefit to be gained by buttering.
RE: 316 SS pipe welding to carbon steel
Also as reproted on the cited pub of NIDI "the portion of the joint where difficulties are most likely to occour is buttered while there is little restrain on the weld metal.."
So in my opinion butter is always a "good practice", and if i have to prepare a wps i'll include it; also 'csue the requirement for PWHT are not always the same and in this case i don't know the thickness involved.
S.
http://www.corrosionist.com
RE: 316 SS pipe welding to carbon steel
strider6: do those articles at the "nickel" website cost, or is memebership free? I see a lot of "order by mail" stuff, but the pdf's seem pretty small.
Olaf
RE: 316 SS pipe welding to carbon steel