That's mild steel wire, so NO, don't use it for stainless steel. The user's manual talks about an aluminum and stainless kit for those materials.
Here's a link to the owner's manual for your welder. http://www.lincolnelectric.com/assets/servicenavigator-public/lincoln3/im787.pdf


Kevin
1951 Chevy 3100 work truck
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Photos
1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.