Welding mild steel to stainless using steel wire.

[aperry]

How can I find information on any ill effects of using steel welding wire to join mild steel to stainless (304)?
It is not a highly stressed application, but I would like to know if the weld joint would be effected. Weld corrosion is not a problem as the parts will be painted. I don't wan't to have to switch to a stainless wire in the middle of an operation.

 

[ijzer]

You can have a look at the Schaeffler Diagram and will probably find that you created a brittle martensite structure.

 

[stanweld]

Welding stainless steel to mild carbon steel should be avoided because dilution with the stainless steel creates an approximate 5% Cr - 2% Ni weld deposit. This deposit can be martensitic and could lead to hydrogen induced cracking. Preheating can be done to mitigate this problem. Preheating requirements will be based on the welding electrode/filler metal and welding process used and the thickness of the materials to be welded.

 

[stanweld]

Another reason for using stainless steel weld filler metals is that the deposited weld metal, most prone to have flaws, is highly ductile. This can provide greater resistance to failure in cyclic and dynamic loading situations.

 

[unclesyd]

DON'T use C/S welding wire to weld C/S to S/S even though you can do it. We weld C/S to S/S everyday using 309 S/S rod and wire. Most of the welds operate at 600°F and cycle to 1000°F for short peroids 3 to 4 times per year.
We weld pipe and plate as is where is with nothing other than the normal prep for welding. We use this in the procedure to qualify welders for SMAW welding of S/S.

 

[sayee1]

See thread330-65649 for more discussion on same topic

Thanks and regards
Sayee Prasad R
Ph: 0097143968906
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email: sayee_prasad@yahoo.com
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