I need to weld a 1/2" mild steel plate to a 1/4" SS plate. Mild steel
Tee-ing into SS. Can I use 6013? 6011? I'd just as soon not buy a box
of new rod for a single use.
I have a 90A MIG, with C25 gas. Would that be better?
Safety is not at risk here. Just plenty of annoyance if it breaks.
They recommend using stainless rod for this.
I had the same situation once. I did weld stainless to mild, with
6013. The weld holds, but there is almost no stress on the weld, this is
a part of a cable hanger assembly for my welder and holds 20 lbs at
most (welding pedal and angle grinder live on this shelf).
What this is about, is I'm building slip rolls & the 1/2" mild pieces
are the ends & the SS are the bottom mounting plates (they're SS only
because that's what I had). The forces on the welds will be from my
pulling on the roll lever. Not that much, but if the welds were
brittle, say, it'd be a pain to rebuild it.
What I've heard here & Googling the archives is that SS rod is really
the way to go. But I did a test - welding up the same material. I put
about 3/4" of bead on each side & a bead across the end (1/2"). I
welded a 24" piece of 1" bar to the 1/2" plate, for leverage.
To test it I put the SS plate in the vice & pulled on the 1" bar
(actually, I supported my 190lbs on it). As far as strength - no
problem, I probably put 400 - 600 lbs tension on it. As far as the
brittleness, I took a rBFG (6lb sledge) & beat on it - no problem. When
I took the test apart I cut the weld on one side & bent the piece back
over the weld on the other side. That weld broke in the middle of the
bead (did not tear out of either piece).
I don't doubt that SS rod is the proper way to go & in a commercial
situation that's what I'd use. But in this HSM context, I'm going with
Thanks for the replies,
Never done it myself, but from a welding engineer
Weld with a high enough Cr and Ni rods that with weld dilution still
end up with austenitic weld metal.
So mixture of the rod composition, the stainless plate and the mild
steel plate (essentially pure iron) gives a pool metal still above
about 18%Cr 8%Ni.
Isn't there a stainless composition about 25%Cr 18%Ni whose rods are
favourite for this type of job?