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ledon (Marine/Ocean) (OP)
19 May 11 9:05
What is the best filler metal for GTAW welding of Alloy 20 stainless steel pipe?
metengr (Materials)
19 May 11 10:18
Use SFA 5.14 ERNiCrMo-9
stanweld (Materials)
19 May 11 10:48
The "best" is somewhat subjective. Least cost? Most corrosion resistant?

We use E/ER320LR, E/ERNiCrMo-3 and other more corrosion resistant Nickel base filler metals; e.g., E/ERNiCrMo-4, etc.   

AndyVictor (Mechanical)
22 May 11 1:48
What about ER 320LR? This is the recommended filler wire by some  manufacturers?

Andy
metengr (Materials)
22 May 11 12:13
Yes, this could be used. What is the service application of the 20Cb-3 stainless steel?
EdStainless (Materials)
23 May 11 10:10
If they are using 20 them I assume that they are after acid resistance.
I which case you had better use a stabilized 20 chemistry for filler.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

stanweld (Materials)
23 May 11 14:58
Welds made with ER320 are highly susceptible to hot cracking. the use of ER320LR greatly minimizes its potential.  

brimstoner (Materials)
24 May 11 13:26
I concur with stanweld; welding with 320 can be tricky because things need to be kept ultra-clean to avoid hot cracking.  It might be easier to resort to some of the Ni alloys already posted above.   
weldtek (Materials)
26 May 11 15:08
In my experience cleanliness is critical when welding any of the  Ni alloys.  ER320LR should be fine from a welding standpoint.  We use it regularly.  Use the same good practices you would use for any Ni alloys and you'll be fine.   

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