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Posted by Bruce on June 17, 2007, 1:23 am
Please log in for more thread options On 16 Jun 2007 17:55:36 GMT, curt@kcwc.com (Curt Welch) wrote:
>> I have a recently purchased 40 amp plasma cutter and have some
>> questions.
>>
>> Most of my day to day cutting is 1/8" - 1/4" mild steel and as this
>> stuff will all be welded I'm trying to get the cleanest cut with the
>> least slag possible.
>>
>> I have experimented with varying the amperage and air pressure and it
>> seems as though lowering the air pressure results in a cleaner cut.
>
>Have you tried experimenting with travel speed as well? That's just as
>important. Moving too slow will allow the arc to melt extra metal and
>leave more slag.
>
>You can also play with the distance of the torch away from the work piece.
>
>> The recommended air pressure is 4.5 Kg/Cm2 and it appears that using 3
>> - 3-1/2 Kg/Cm2 is giving me cleaner cuts.
>>
>> My question is what should I be doing to get the cleanest cuts
>> possible and whether lowering the air pressure will result in damage
>> or premature wear on the machine or consumables?
>
>If lowering the pressure gets a cleaner cut, I doubt it will cause the
>consumables to wear out faster.
After reading your response I suspect that a combination of air
pressure and cutting speed is the answer since a great deal of what I
am cutting is freehand shapes and I do tend to go rather slowly in
order to stay on line. I know that a template wold make things go
faster but as these things are usually one offs making a pattern for
each piece would double the time for the job.
I'll keep experimenting.
Bruce in Bangkok
(brucepaigeatgmaildotcom)
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> questions.
>
> Most of my day to day cutting is 1/8" - 1/4" mild steel and as this
> stuff will all be welded I'm trying to get the cleanest cut with the
> least slag possible.
>
> I have experimented with varying the amperage and air pressure and it
> seems as though lowering the air pressure results in a cleaner cut.