filler rod question

[FabioP]

I am building a trailing arm using mild steel. I've been using 1/16" 70S-2 rod. I went to the welding shop next to my house and they just had 70S-6 rods. What's the difference??? Can I run the second pass using 70S-6 on top of 70S-2?

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[Wild bill]

Don't worry about it. The chemistry difference is minimal.