From: NT on
On Jul 22, 10:58 pm, Mark <M...(a)127.0.0.1> wrote:

> If you have never used one before you need to practise and get your
> technique perfected before you even think of starting on the VW.
> unlike this chap  http://i31.tinypic.com/vq4hns.jpg

lol
From: Dave Plowman (News) on
In article <i2bjsq$p9e$1(a)news.eternal-september.org>,
Fredxx <fredxx(a)spam.com> wrote:

> "Andy Dingley" <dingbat(a)codesmiths.com> wrote in message
> news:de442991-ca06-4e13-8e58-5fbd1a7367fa(a)d37g2000yqm.googlegroups.com...
> > On 22 July, 20:43, "steve robinson" <st...(a)colevalleyinteriors.co.uk>
> > wrote:
> >
> >> Its not that easy to use on car bodywork though as it tends to cut
> >> through .
> >
> > Are you using the right welder polarity?

> I've read an number of articles which suggest it doesn't make much
> difference and that its more the current/voltage characteristics which
> are more important.

> My MIG is wired for gas, and my understanding the ideal polarity is the
> reverse for gasless wire, yet I can make satisfactory welds. If you
> have an alternative experience I would like to hear them.


That's interesting - I have a SIP Migmate for gas only, and would like the
option of gasless. Do you need any other parts other than the wire?

--
*Time flies like an arrow. Fruit flies like a banana.*

Dave Plowman dave(a)davenoise.co.uk London SW
To e-mail, change noise into sound.
From: Jim K on
On 23 July, 09:43, "Dave Plowman (News)" <d...(a)davenoise.co.uk> wrote:
> In article <i2bjsq$p9...(a)news.eternal-september.org>,
> Fredxx <fre...(a)spam.com> wrote:
>
> > "Andy Dingley" <ding...(a)codesmiths.com> wrote in message
> >news:de442991-ca06-4e13-8e58-5fbd1a7367fa(a)d37g2000yqm.googlegroups.com...
> > > On 22 July, 20:43, "steve robinson" <st...(a)colevalleyinteriors.co.uk>
> > > wrote:
>
> > >> Its not that easy to use on car bodywork though as it tends to cut
> > >> through .
>
> > > Are you using the right welder polarity?
> > I've read an number of articles which suggest it doesn't make much
> > difference and that its more the current/voltage characteristics which
> > are more important.
> > My MIG is wired for gas, and my understanding the ideal polarity is the
> > reverse for gasless wire, yet I can make satisfactory welds. If you
> > have an alternative experience I would like to hear them.
>
> That's interesting - I have a SIP Migmate for gas only, and would like the
> option of gasless. Do you need any other parts other than the wire?

no - tho all "either way" machines have easy access to reverse
polarity of torch/earth - tho seems some don't bother....

cheers
Jim K
From: Andy Dingley on
On 23 July, 09:22, "Fredxx" <fre...(a)spam.com> wrote:

> My MIG is wired for gas, and my understanding the ideal polarity is the
> reverse for gasless wire, yet I can make satisfactory welds.  

Yes, reversing the polarity is ideal. If you don't do this, you'll
burn the base metal, just as reported here.

Some cheap gas/gasless welders run permanently with gasless polarity
(wire hotter than base), so they would suffer from poor penetration if
used for thick metals, which admittedly they're unlikely to be used
on.
From: Andy Dingley on
On 22 July, 23:54, Pete M <pete.mur...(a)SPAMFREEblueyonder.co.uk>
wrote:

> You can get a secondhand TIG welder for about £350. They rock!

Slow though. I can't imagine why I'd use TIG on car bodywork, when I
could use oxy-acetylene instead. Both have just the same problem of
being a slow, high-skill process to handle the torch and filler.