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Welding Aluminum Bronze to Carbon Steel
2

Welding Aluminum Bronze to Carbon Steel

Welding Aluminum Bronze to Carbon Steel

(OP)
Does anyone have recommendations for filler material welding SB171 UNS61400 to SA516 Gr70? Would this alloy be a better (easier to CODE weld) than SB171 UNS63000? The next question is welding the UNS61400 (or UNS63000) to UNS70600 (90/10 CuNi), any filler recommendations?  

Does anyone have any practical tips for making these welds?

This would be for an ASME Sec. VIII D1, tubesheet to shell weld. I have flexibility in my Copper alloy tubesheet, but it must be readily weldable to SA516 Gr70 and 90/10 CuNi. We will need to qualify this procedure so I would appreciate any help.   

RE: Welding Aluminum Bronze to Carbon Steel

I would use UNS C63000 with SFA 5.7 ERCu-Al A2 to join to carbon steel as well as to join Cu-Ni.

RE: Welding Aluminum Bronze to Carbon Steel

ERCuAl-2 is recommended for welding aluminum bronze and 90Cu/10Ni to carbon steel. ERNi-1 could also be used.

RE: Welding Aluminum Bronze to Carbon Steel

(OP)
Thanks for the helpful input. Are there any added benefits to welding the CS base metal to the Ni Al Bronze vs regular Al Bronze vs 70/30? I'm most concerned with quality and ease in welding.

However if all things are equal the price difference between the alloys is about $1/lb, but I can reduce my tubesheet thickness based on the higher allowable stresses. It's a balancing act, and I'm not very familiar with this dissimilar weld.

 

RE: Welding Aluminum Bronze to Carbon Steel

Your chief concerns with dissimilar welds are dissimilar expansion and thermal cycling resulting in thermal fatigue failure and galvanic corrosion of the less noble material in the environment.     

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