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Posted by Ignoramus24794 on September 12, 2008, 8:20 am
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Finally,yesterday was the day in our welding class where we got to
practice with O/A. The practice was to make puddles on 16 gauge
sheetmetal. What surprised me is that I did not burn through metal tat
was so thin, at least except a few times. The puddle would be just so
very shallow one on top. I felt as though it would melt right through,
which it did not.
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Posted by Grant Erwin on September 12, 2008, 9:49 am
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Ignoramus24794 wrote:
> Finally,yesterday was the day in our welding class where we got to
> practice with O/A. The practice was to make puddles on 16 gauge
> sheetmetal. What surprised me is that I did not burn through metal tat
> was so thin, at least except a few times. The puddle would be just so
> very shallow one on top. I felt as though it would melt right through,
> which it did not.
>
It's good practice when first learning O/A to actually deliberately burn
through enough times so you get a feel for it. This will help you get
penetration later on.
Grant
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Posted by Bob La Londe on September 12, 2008, 11:44 am
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> Ignoramus24794 wrote:
>
>> Finally,yesterday was the day in our welding class where we got to
>> practice with O/A. The practice was to make puddles on 16 gauge
>> sheetmetal. What surprised me is that I did not burn through metal tat
>> was so thin, at least except a few times. The puddle would be just so
>> very shallow one on top. I felt as though it would melt right through,
>> which it did not.
>
> It's good practice when first learning O/A to actually deliberately burn
> through enough times so you get a feel for it. This will help you get
> penetration later on.
>
> Grant
The guy who taught me gave me a coat hanger and an old muffler. He would
have me blow holes in the muffler, then patch over them.
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Posted by SteveB on September 12, 2008, 10:23 pm
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>> Ignoramus24794 wrote:
>>
>>> Finally,yesterday was the day in our welding class where we got to
>>> practice with O/A. The practice was to make puddles on 16 gauge
>>> sheetmetal. What surprised me is that I did not burn through metal tat
>>> was so thin, at least except a few times. The puddle would be just so
>>> very shallow one on top. I felt as though it would melt right through,
>>> which it did not.
>>
>> It's good practice when first learning O/A to actually deliberately burn
>> through enough times so you get a feel for it. This will help you get
>> penetration later on.
>>
>> Grant
>
> The guy who taught me gave me a coat hanger and an old muffler. He would
> have me blow holes in the muffler, then patch over them.
My dad, now deceased, born in 1918, said this was how they would fix the
fenders on the model A and T Fords. Coathangers were the preferred filler
metal.
Steve
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Posted by Curt Welch on September 12, 2008, 12:10 pm
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> Finally,yesterday was the day in our welding class where we got to
> practice with O/A. The practice was to make puddles on 16 gauge
> sheetmetal. What surprised me is that I did not burn through metal tat
> was so thin, at least except a few times. The puddle would be just so
> very shallow one on top. I felt as though it would melt right through,
> which it did not.
It's tricky that way. It knows you are just practicing and won't melt
through. It waits until the instructor is standing over you watching and
then a hole the size of a quarter instantly opens up. :)
Our school switched to 18 ga material because the new foot shear they
bought was wearing out too fast trying to cut 16 ga steel. So I got a lot
of practice on even thinner stuff with all the processes.
The real trick is getting full penetration when you do a joint. If you
don't heat it enough, the bottom edge won't melt and bond together but if
you heat it just a little too much, you get holes. You have to burn though
enough to get a feel for when it's about to happen because to get the
penetration, you have to stop heating right _before_ it burns through.
--
Curt Welch http://CurtWelch.Com/
curt@kcwc.com http://NewsReader.Com/
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> practice with O/A. The practice was to make puddles on 16 gauge
> sheetmetal. What surprised me is that I did not burn through metal tat
> was so thin, at least except a few times. The puddle would be just so
> very shallow one on top. I felt as though it would melt right through,
> which it did not.
>