[AT] welding problems

[charliehill]

My reference says the any Exx18 rod is an all position, AC or DC, Reverse, 
iron powder, low hydrogen rod.
The xx denotes the strength, 70 is 70,000 psi.

All I know about  7018's personally is they are the sweetest running rods 
I've ever burned.



----- Original Message ----- 
From: "Alan Nadeau" <ajnadeau1 at myfairpoint.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Sunday, November 15, 2009 2:46 PM
Subject: Re: [AT] welding problems


> Gene, I beg to differ with you.  Every 7018, but one, listed in my pocket
> reference is listed as AC or DC Reverse polarity.  The one exception is 
> the
> 7018AC, which is intended for the common home/farm shop welders which tend
> to have low open circuit voltage.
>
> As for the original issues that started this thread, 1/8" **18 class
> electrodes should run fine at 180 amps.  The sticking/hard starting can be
> as much a problem of low OCV as amperage.   There is usually some sort of
> capacitance device in the welding circuit to smooth out the tremendous 
> drop
> in voltage and rise in amperage when an electrode is struck.  I'm not sure
> what bad stuff happens when that fails but I'm pretty sure it causes the
> hard starting symptoms described.
>
> As for it being the Hyundai electrodes I tend to discount that as long as
> they are labeled as conforming to AWS Specs.
>
> Al Nadeau
>
>
> ----- Original Message ----- 
> From: "Gene Dotson" <gdotsly at watchtv.net>
> To: "Antique tractor email discussion group" 
> <at at lists.antique-tractor.com>
> Sent: Sunday, November 15, 2009 8:54 AM
> Subject: Re: [AT] welding problems
>
>
>>    John'
>>    Is your welder an AC only? Conventional 7018 rods are run on DC. There
>> is a 7018 rod made to run on AC, but has to be specific.
>>
>>    If your welder has DC capability, you may be running the wrong 
>> polarity
>> as 7018 DC is polarity sensitive.
>>
>>    I have a Lincoln AC welder and do most of my welding with 6011 and 
>> 6013
>> rods. Get best penetration witt 6011 and 6013 works better on thin metals
>> and gives a smoother weld.
>>
>>                    Gene
>>
>>
>>
>> ----- Original Message ----- 
>> From: "John Hall" <jthall at worldnet.att.net>
>> To: "Antique tractor email discussion group"
>> <at at lists.antique-tractor.com>
>> Sent: Sunday, November 15, 2009 8:29 AM
>> Subject: [AT] welding problems
>>
>>
>>> OK stick welding experts, got one for you. The welder we have is a 40+
>>> year
>>> old Marquette, bought new for use here on the farm. I had to buy some
>>> more
>>> welding rods over the past several months and unfortunately had to 
>>> switch
>>> brands. We had always used Hobart (or possibly Lincoln) rods. The 
>>> welding
>>> supply chain now only sells Hyundai rods in small quantities (10 lb)
>>> boxes.
>>> I can't justify buying 50lbs of Hobart rods.
>>> Anyway, on to my problem. I picked up a new box of 1/8" 7018 rods to do
>>> some repair on my subsoiler. I set the welder as high as it would go
>>> (180)
>>> and could not get it to weld. All I could get was a couple of arcs and
>>> sometimes the rod would stick.  Before you ask, yes I cleaned where I 
>>> was
>>> welding, cleaned the ground area, made sure the terminals on the welder
>>> were
>>> clean, and even cut off and reinstalled the end of the ground cable 
>>> where
>>> it
>>> goes into the clamp. I also tried grounding and welding on 3 different
>>> pieces--all of varying size and thickness.  I resorted to using 3/32 
>>> rods
>>> with the welder set on 125. It would run those rods so hot that they
>>> would
>>> almost turn red before it was time to switch. I know I have used 1/8"
>>> 7014
>>> before, so my question is this--Is there a difference between 7014 and
>>> 7018
>>> that makes the 7018 require a higher setting on the welder, Is there
>>> something wrong with the welder, or is it something to do with these
>>> imported rods?
>>>
>>> John Hall
>>>
>>> _______________________________________________
>>> AT mailing list
>>> http://www.antique-tractor.com/mailman/listinfo/at
>>
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