TIG welding - changes of light intensity: what's going on?

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When welding both stainless and aluminium at low currents (typically 20 - 40
30A) I frequently find that the arc changes from a fairly dim to a very
bright light, apparently for no reason and at random. This makes it very
difficult to see what's going on because my eyes can't react quickly enough
to the light level before it changes.

What causes this and how do I avoid it?

I'm using a Lincoln Invertec 205 with pure argon and 1.6mm rods (red ones for
stainless, white ones for ali). (And no, I don't have the pulser switched
on!)

Nick.


Re: TIG welding - changes of light intensity: what's going on?
seems like it gets brighter when the tungsten touches the weld puddle.


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Re: TIG welding - changes of light intensity: what's going on?
On Fri, 20 Jan 2006 00:34:44 +0000, Sailor wrote


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You may be right, but I don't think this is what is happening. Any other
ideas?

Nick.


Re: TIG welding - changes of light intensity: what's going on?
Are you using an auto darkening helmet?

Nick Williams wrote:
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Re: TIG welding - changes of light intensity: what's going on?
MK1 wrote:
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+1 for auto helmet (if that's what you're using)

I had an issue with my cheapo Harbor Freight auto darkening helmet,
where it would cut out intermittently. I complained, sent it back, and
got a replacement, which now workes more consistently for aluminum. But
for some reason it still cuts out when I'm welding steel.
--
Ilya


Re: TIG welding - changes of light intensity: what's going on?

iillyyaa@gmail.com wrote:
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This happens once and a while at low currents even with my NexGen
helmet.

Frank


Re: TIG welding - changes of light intensity: what's going on?
On Fri, 20 Jan 2006 12:58:28 +0000, FThera@comcast.net wrote

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Full marks to all those who suggested the helmet problem. I put some new
batteries in and the problem's cured. Disappointingly, it hasn't altered the
fact that I'm not a very good welder though!

Nick.


Re: TIG welding - changes of light intensity: what's going on?
On Thu, 19 Jan 2006 23:58:20 +0000, Nick Williams

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It might be caused by the input voltage to your welder temporarily
deviating from standard.  This tends to happen in industrial areas
where the power distribution transformer is shared with other
industries that place a periodic varying load on the power utility.

If you are certain that this is not a TIG torch operator error (ie.
you are not dipping the tungsten into the puddle) you might want to
call up your electrical contractor and have them attach a recording
voltmeter on the power input side of your welder.  A recording
voltmeter is a device that graphs the voltage level on a roll of cash
register tape over a period of time for later review.

If your input voltage is varying widely, you might want to take the
matter up with your local power utility, using the voltmeter
recordings to support your complaint.  The typical solution is for the
power utility to install a power distribution transformer for your
exclusive use.

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Re: TIG welding - changes of light intensity: what's going on?
If you're using an auto helmet, try turning the helmet's sensitivity up (
more sensitive ). I had this same problem  and that worked for me.

Paul



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