Proper Handling of Welding Rods
Welding rods get no respect. Out in the field I've seen guys
throwing 50lb. rod cans from the truck onto the ground, torching
cans open diagonally, beating the wrong end open with a chipping
hammer and every other conceivable tool, and leaving open rod
cans out in the open.
Let's look at what's wrong with each...
First and foremost, ALWAYS open the "right" end of the can. Some
cans and boxes even say "open other end", or "don't open this
end", or "the other end moron!." (last one made up by me.) The
reason you need to open the right end is because you can damage
the flux coating. You want to open it on the side where the rod
is bare for the stinger, or electrode holder. There's a lot less
chance of damaging the flux that way. 7018 is very prone to flux
damage while 6010 is a lot tougher.
Most guys out in the field aren't gonna' be thinking about the
welding rods inside the can as they toss them from the truck to
the ground. When the cans get manhandled the flux gets jarred
loose on the welding rods inside. It's bad enough when the flux
gets chipped off the end of the rod, flux chipped from the
middle and you can pretty much kiss that rod goodbye. It's
worse, if you don't realize it's chipped because right in the
middle of a good weld you'll suddenly be welding with no flux.
No flux equals no shielding from the atmosphere, and that equals
a garbage weld.
You can use a lot of different ways to open rod cans out in the
field if you are careful. I've even used the P38 C ration can
opener I had in the army.If you use an oxygen/acetylene torch
you need to be real careful not to burn the flux on the rods
inside.
You can open a rod can with a chipping hammer, but it's not
advisable. You gotta' be sure and hit it just right, at the edge
of the can. You should hit the edge with the hammer
follow-through swinging away from the can, not striking down
into the can at the top. (I'm sure the electrode manufacturers
are cringing when they read this!)
Of course the best way is whatever the can is designed for, some
of them open like a sardine can, but a lot of times it doesn't
work so you gotta' improvise.
Leaving open cans out allows moisture to get into the flux.
Moisture in the flux can cause porosity, or worm holes in the
weld. Rods should be stored in a proper oven or unheated
container if they don't need the moisture protection. 7018 needs
an oven, while 6010 doesn't need the heat, but still needs to be
kept protected.
See http://rodovens.com/welding_articles/storage_chart.htm for
proper storage of rods.