Re: Was given a new 90 AMP BUZZ BOX, what electrodes should I use ?


"N9WOS" <Don't@xxxxxx> wrote in message
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"N9WOS" <Don't@xxxxxx> wrote in message
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'Creep-resistant' is an unfamiliar term for me, please define or
explain. As I mentioned, I have no knowledge or experience of or with
rods designated as 7013. Do they have a specialized use that I am
unaware of? Is their usage industry specific or a regional thing?

If you look at a firebox of an old wood stove with the sides and top
drooping or bloated from long exposure to high temperatures, then you
will have a working definition of high temp creep.,

Creep resistance is the resistance to plastic deformation under long
exposure to high, or elevated temperatures. Like used in boilers, and
such.

One of the big problems is hydrogen embitterment damaging the plastic
properties of the weld joint. You will have some plastic flow and
deformation of the weld joint, no mater what type of rod you use. That is
a result of the cyclic heating and cooling that normally comes along with
high temp applications. All you are trying to do is limit the plastic
flow to a reasonable level to obtain a useful life out of the product.
But if you have some parts of the weld that have become brittle because
of hydrogen entrapment, then that part will crack from the cyclic heating
and cooling (because the brittleness of the metal can't tolerate the
cycling deformation) long before the rest of the joint reaches it's end
of life condition.

I have found the answer.

Some spec sheets have 7013, 8013 and 9013specified as low hydrogen. But
in the same PDF state that drying isn't required. That is counter
intuitive. But I have been forgetting that they are CrMo steel. Or
basically hydrogen resistant steel. Same as the base metal they are
designed for.

http://www.alruqee.net/ind_mkt/RIM-CD&WEB/welding_consumable-files/bohler/174en00.pdf

Since they are rutile instead of basic, which mean that the coating isn't
hygroscopic. That means that it doesn't have an inherent problem with the
coating water logging. And the fact is that what ever hydrogen is present,
isn't going to cause the metal any problem, because the metal is naturally
resistant.

So it naturally produces low hydrogen welds, and doesn't need drying
unless it is subjected to extremely wet conditions before use.

Drying won't cause them any problem, but it isn't needed.

That is as long as it is used on the base metal that it was designed for.
That being CrMo steel.

Thanks for the complete and well written response.


.

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