[T3] Invasion and Post Invasion Repairs

[John LaFrancois]

Agreed if the bar is not hard along it's entire length then a mild slow
cool down after welding is the way to go.  I would have thought that the
torsion bars, to have much spring action, would be hard though.  🤔

On Thu, Aug 9, 2018 at 4:40 PM, Jim Adney <jadney at vwtype3.org> wrote:

> On 9 Aug 2018 at 9:31, John LaFrancois wrote:
>
> > Just thinking out loud here, I haven't checked this, but is it possible
> > that the most of the bar is hardened, and the ends are softer?  Or the
> > machining on the ends of the bar may have removed most/all of the
> > hardening in those areas?  I would think that one might be able to keep
> > some/most of the hardness after welding spring steel if the weld areas or
> > heat were isolated, and quenched while still hot.
>
> I checked the middle of a junk bar, and it wasn't hard there either. That
> means that the welding doesn't have to be much of a concern. Our welder,
> Bill, suggested that we let the welded end of the bar cool very slowly in
> his
> bucket of lime powder. When I came back after an hour, it was still quite
> warm to the touch.
>
> The filler rod he used was ER70S-2, done with TIG. This left a nice bead
> that I was able to file easily.
>
> So far this appears to be working quite well, so it looks like a gentle
> weld
> and slow cool is the way to go.
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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