Acceptable filler for alloy 20 Stainless Steel

[ledon]

What is the best filler metal for GTAW welding of Alloy 20 stainless steel pipe?

 

[metengr]

Use SFA 5.14 ERNiCrMo-9

 

[stanweld]

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]

What about ER 320LR? This is the recommended filler wire by some manufacturers?

Andy

 

[metengr]

Yes, this could be used. What is the service application of the 20Cb-3 stainless steel?

 

[EdStainless]

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.

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Plymouth Tube

 

[stanweld]

Welds made with ER320 are highly susceptible to hot cracking. the use of ER320LR greatly minimizes its potential.

 

[Guest102023]

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]

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.