jrock,
There are a couple of options. Use an ER70S-6 or ER80S-6 in 1/16" or .040" diameter. Just keep your filler the same size or one size less than the material thickness to be welded. I usually use the ER70S-6 unless I can't find it and then I go with the slightly higher tensile strength and slightly more expensive ER80S-6.
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