316L with CA6NM
316L with CA6NM
(OP)
I have to weld a pipe ( vent, drain, flushing ) in 316L on a pump casing in martensitic steel CA6NM.
What do you suggest for filler métal. I don't want to do a postweld heat treatment, because my pump casing is machined.
Thank you for your help.
JL
What do you suggest for filler métal. I don't want to do a postweld heat treatment, because my pump casing is machined.
Thank you for your help.
JL





RE: 316L with CA6NM
Typically the as-welded heat affected zone in CA6NM is very hard and this is unaffected by the choice of consumable.
RE: 316L with CA6NM
RE: 316L with CA6NM
RE: 316L with CA6NM
Thread725-31486
Also this alloy is used to weld your material.
409t1-1/4a
UNS W40931
Specifications
AWS: A5.22 PWHT required
If possible I would use a straight thread nipple/fitting and then a small seal weld with an alloy that would satisfy your requirements. You can weld a couple of small test tabs in inconspicious spots around the periphery of the flanges and see how the behave. We had very good results welding with a proprietary alloy similar to 312 SS on our 410 SS equipment. This was used only for strength not corrosion resistance.
If your casting has been HT previously I wouldn't think that an 1100°F PWHT would affect the dimensions.
What type and how big is your pump?
RE: 316L with CA6NM
Nace is applicable.
JLuc
RE: 316L with CA6NM
RE: 316L with CA6NM