On 8/10/15 7:28 AM, Jim Thomson wrote:
Date: Sun, 9 Aug 2015 16:57:11 -0600
From: EZ Rhino <EZRhino@fastmovers.biz>
To: Towertalk Reflector <towertalk@contesting.com>
Subject: Re: [TowerTalk] Failed HDX572 Raising fixture Leg and base
Likely you actually broke the tab long, long ago. It was only hanging by a
thread, and that gave the separated parts time to rust. This recent lowering
was what finally did it in. Definitely call UST tomorrow and see what you can
do; Any company worth their salt should stand behind that since it is clearly
poor welding.
Chris
KF7p
## Obviously this was a fubar welding job. Question is, why didn’t UST X ray
the welds for the base ? Ok, I can see not X raying every weld on each tower
section, but at least do the critical welds, like the base,
and where the plates are for the pulleys.
I'll hazard a guess that they don't have the equipment or training to do
the X-ray-ing.
They, like many manufacturers, probably rely on training, visual
inspection, and occasional destructive analysis (i.e. cut the weld in
half and look at it).
I don't recall any of the welding shops I used to deal with having this
capability, although I'm sure one could contract it out, or find one
that did.
We used to proof test safety critical components at 2x design load, but
given the overdesign and structural redundancy, I suspect that we could
have had a totally broken weld (or a weld that was completely missed)
and not had a failure.
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