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Re: Welding

To: "Tigers e-mail list" <tigers@autox.team.net>
Subject: Re: Welding
From: "Arden Bedell" <sixtysixtiger@hotmail.com>
Date: Fri, 15 Jun 2001 11:24:26 -0700
Wow, that got massacred in the translation!  Open this message and edit
remove the carriage returns and  to replace all the ) with alt+0169 and
you'll get what I intended.

--Arden

----- Original Message -----
From: "Arden Bedell" <sixtysixtiger@hotmail.com>
To: "Tigers e-mail list" <tigers@autox.team.net>; <SFordRB@aol.com>
Sent: Friday, June 15, 2001 11:19 AM
Subject: Re: Welding


> Well...auto-stitching isn't quite the same thing.  Auto-stitching just
> controls the on-off cycle of the welder as you move along your seam.  So,
> basically you start at one end and move along at some (nearly) constant
pace
> and the welder cycles on and off leaving short intervals of bead
alternating
> with gaps.
>
> What I was describing looks like this:
>
> )-------------| 1 |--------------)--------------| 3
> |--------------)--------------| 2 |--------------)
>
> where the dashed line is the seam you want to weld and the ) symbols are
the
> initial tack welds.  Welds 1, 2 and 3 split the distances between the
tacks
> and are themselves tack welds, too.  Then what you'll do next is:
>
> )-----| 4 |-----)-----| 6 |-----)-----| 8 |-----)-----| 9 |-----)-----| 7
> |-----)-----| 5 |-----)
>
> splitting the distances again, alternating back and forth across the
length
> of the seam so that the heat-affected zones are as widely separated as
> possible.  The idea is that as you move from one end to the other, there
is
> some time for the metal to cool minimizing expansion and warpage.  As the
> spots get closer together, you should wait longer before applying the next
> spot.  Eventually what you get is a continuous weld composed of spot beads
> that can be carefully ground down to slightly lower than flush for final
> filling.
>
> Auto-stitching, on the other hand, would attempt to do this in one
operation
> where the sequence would look like this:
>
> )----| 1 |----| 2 |----| 3 |----| 4 |----| 5 |---)---| 7 |----| 8 |----| 9
> |----| 10 |----| 11 |----)
>
> The danger here is that if the amperage of the welder is high enough to
> achieve good penetration, because you're welding in a linear pattern with
> spots fairly close together, you run the risk of building enough heat in
the
> sheet to cause expansion and thus warpage.
>
>
> --Arden
>
>
>
>
> ----- Original Message -----
> From: <SFordRB@aol.com>
> To: <sixtysixtiger@hotmail.com>
> Sent: Friday, June 15, 2001 10:47 AM
> Subject: Re: Welding
>
>
> > Snap-On has a Mig that will do a chain or stitch weld which is what
Arden
> is
> > talking about. Still think a TIG is the best alternative barring cost
and
> > learning curve. Miller used to have factory returns that were available
> with
> > a warranty....may be able to save some money and get a quality machine.
> > Miller also attends as does Lincoln most of the N.S.R.A meets and
usually
> > gives great discounts. (make this my 10 cents worth)
> >
> > Sean  "Dr. Moonstone"
> >
> > P.S. Now that I solved the days problems I'll get back to work (It's a
> joke,
> > don't get huffy anyone)

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