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Posted by Vaughn on June 1, 2006, 11:08 am
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Steve B wrote:
> I just changed my MIG wire from .030 to .023 for doing some smaller stuff.
>
> In the past, I have always used an oversized tip, as they seem never to bind
> up or get fried shut.
>
> Is this an okay thing to do?
>
In my humble, non professional opinion NO. I was taught that this tip is
the only contact for the current to flow through to get the spark. My
instructor said that you should change the tip for a new one every 45
main of welding, and most he speaks to, who say they have trouble
getting a good flow, often do not renew the tip often enough. ;-)
Like I say I only Hobby weld, but I have very few problems with the
Argoshield Gas I use, not that dirty CO2 ;-), and regular tip changes.
I'm sure there are many other reasons for using the correct tip and
other more experienced welders here will pop into this to help justify
what I've said.
Only point I have on top of this is that I seem to remember that
Aluminium requires a larger tip as it often expands when in use, but if
I'm wrong I'm sure I'll be told. ;-)
Hope this helps, and will watch this one to see if I'm doing things
write or not ;-)
Vaughn
> I started doing this with my Millermatic 200 in the 80s. Running .045 tips
> no matter what wire. Lots less binding.
>
> Steve
>
>
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>
> In the past, I have always used an oversized tip, as they seem never to bind
> up or get fried shut.
>
> Is this an okay thing to do?
>