Re: [TowerTalk] Failed HDX572 Raising fixture Leg and base

[Kevin Stover <kevin.stover@mediacombb.net>]

Yes.
If the weld looks like a worm laying on the steel it is what we call a 
"cold" weld.
Rust behind the weld is also a dead give away.
With a well made weld the base metal will tear from stress long before 
the weld will fail.

On 8/9/2015 4:24 PM, Robert Harmon wrote:
> Rich,
>
> In my opinion it separated because the weld did not have full penetration.  Not 
> enough amperage when the weld was made.
> One of the first welds learned in welding class is a fillet weld where a piece 
> of steel plate is welded to another at right angle.
> After running a fillet weld on one side, it is clamped in a vice and hit with a 
> hammer on the side opposite the fillet.  If it breaks off
> you did not have the amperage high enough for good penetration.  The pictures 
> show this to me.  If welded correctly with full penetration
> the joint is stronger than the metal and we would see tearing of the metal, and 
> in this case no rust where it tore off.
>
> Bob
> K6UJ
>
>
> > On Aug 9, 2015, at 12:19 PM, Rich Hallman - N7TR <rich@n7tr.com> wrote:
> >
> > This morning I was lowering my HDX572 and as it was almost down one of the base 
> > ears that the raising fixture leg mounts to failed.   Fortunately it was a slow 
> > drop and the tower is still ok.  If it failed while it was higher this could 
> > have been a different story.
> >
> > I will need a new raising fixture and a new HDX572 base.   I have a like new 
> > spare TRX-80HD raising fixture for my HDX589 so I should be ok there.
> >
> > I posted some pics and will add more later today.  From the looks of the break, 
> > I am seeing rust (Not clean metal) where the welds were.  Also I'm not sure if 
> > the ear on the one leg that mounts to the raising fixture began to bend first 
> > or not.   But it is bent a hard 90 degrees now as you can see.
> >
> > Anyone else see something like this in the past?   This is an older US Tower so 
> > I'm not sure if the bases are built better now or not for the mounting ear.
> >
> > Go to my QRZ Page http://www.qrz.com/db/N7TR  And look for the link called 
> > HDX572 Raising Fixture Failure.
> >
> > Rich N7TR
> > ex KI3V, N3AMK, WB3JOV
> > www.n7tr.com<http://www.n7tr.com>
> > http://www.qrz.com/db/N7TR
> > Telnet: dxc.n7tr.com N7TR DXCluster
> >
> >
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> >
> >
> >
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--
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441

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