7018 baking temps

[Robert Fisher]

According to AWS D1.1, 7018 is to be baked at a minumum of 250 degrees.
What is the maximum temperature it may be baked for an extended period
of time, and what are the consequences of over cooking it?

[Randy Zimmerman]

The CWB W59 call for basic electrodes to be baked for at least one hour at
370 to 430 Celsius. That's 698 to 806 degrees F.
Storage temp is 120 C or 248 F. That's a bit higher than the D1.1
I have never heard of rods being overcooked.

Robert Fisher wrote in message <37E1C546...@zianet.com>...

[Mike Graham]

On Fri, 17 Sep 1999 02:20:48 -0700, Randy Zimmerman wrote:
>The CWB W59 call for basic electrodes to be baked for at least one hour at
>370 to 430 Celsius. That's 698 to 806 degrees F.
> Storage temp is 120 C or 248 F. That's a bit higher than the D1.1
> I have never heard of rods being overcooked.

I've done it. The flux gets fragile and chips off while you're welding.
That's what happened to the batch in my rod oven when the electrics blew
themselves up. Irritating.
The paper from Lincoln says that non-low-hydrogen electrodes should be
stored at 100-120F (38-49C) and it specifies NOT to use a higher
temperature, particularly for electrodes from the 'Fast Freeze' group.
Low hydrogen and stainless steel electrodes should be sstored at 250-300F
(120-150C)

--
Mike Graham, mikegraham at sprint dot ca
Caledon, Ontario, Canada (just NW of Toronto).

Raiser of animals. Weldor of metals. Driver of off-road vehicles.
Writer of FAQs. Keeper of the faith, and all around okay guy.

< homepage currently off-line due to change of ISP; back soon >

[Gwyn Phillips]

In article <37E1C546...@zianet.com>, Robert Fisher
<fis...@zianet.com> writes

>According to AWS D1.1, 7018 is to be baked at a minumum of 250 degrees.
>What is the maximum temperature it may be baked for an extended period
>of time, and what are the consequences of over cooking it?
>

some 7018 electrodes recommend 400 deg.C-2hours or lower temp for longer
times.As you are attempting to remove all moisture I would suggest that
any temp from 250-450 deg.C for extended times should be OK.You are
allowed to rebake these electrodes after exposure to the atmosphere.
--
Gwyn Phillips

[Gwyn Phillips]

In article <MVqE3.1917$jy4.1...@newscontent-01.sprint.ca>, Mike Graham
<mikeg...@sprint.ca> writes

>The paper from Lincoln says that non-low-hydrogen electrodes should be
>stored at 100-120F (38-49C) and it specifies NOT to use a higher
>temperature, particularly for electrodes from the 'Fast Freeze' group.
> Low hydrogen and stainless steel electrodes should be sstored at 250-300F
>(120-150C)

Hi Mike,Rutile and cellulosic rods require some moisture to operate
properly that is why they are not low hydrogen quality.ie 6013 & 6010
--
Gwyn Phillips

[Randy Zimmerman]

Mike Graham wrote in message ...
snip

> The paper from Lincoln says that non-low-hydrogen electrodes should be
>stored at 100-120F (38-49C) and it specifies NOT to use a higher
>temperature, particularly for electrodes from the 'Fast Freeze' group.
> Low hydrogen and stainless steel electrodes should be sstored at 250-300F
>(120-150C)
>

"basic" refers to the electrode coating on low hydrogen rods. I find
it interesting that us Canucks always seem to set higher standards with the
CWB code than the AWS. I sometimes wonder if there is a bit of ego
involved.
Randy

[Robert Fisher]

The reason why I ask, and ya' all are really gonna get a kick out of this,
is I am presently doing one of the few code jobs ever done by this "new"
company that I work for. I begged and pleaded for a rod oven, as required
by D1.1, and was given a heat treating furnace used for treating highcarbon
steels. The lowest temperature it holds is 750 degrees. And the kicker
is..... it only holds 50 lbs, while I am using two different rod
diameters. One half of the rod I am using is sitting under an evaporative
cooler.

Boy, if Corp of Engineers catches wind of this.... heh heh heh. (this is
for whom the fabrications are for).

I have used 7018 that was baked in a rod oven at, and I am only guessing,
400 degrees. I did have problems, as was mentioned in a reply, with the
flux flaking off. The electrodes were stored for a very extended period of
time in this manner.

I do know that for certain steels, AWS D1.1 specifies that low hy
electrodes must be baked at
800 F, and if I remember correctly, it is only for 2 hours time, and cannot
be rebaked again, at any temperature. Will have to reread that
portion......

Why should I have to take a chance of failing UT or RT for the sake of a
cheapass employer????

Thanks for your replies, will make some calls directly to manufactures and
let ya'all know what I find out right from the horses mouth.

Bob Fisher