Welding question -
In preparation for doing some simple OA welding on a rudder, I've been
practicing on some 4130 scrap. Since there is filler where it's not
structurally important, I"ve been filing the excess material. All
except one and it's as hard as if I were trying to file stainless.
Is this an indication that I was using an oxidizing flame on that
sample? - MIke
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