On Fri, 11 Aug 2017 02:30:34 -0400, micky
wrote:

In alt.home.repair, on Fri, 11 Aug 2017 03:19:54 +0000, Stormin' Norman
wrote:


I understand how arches work/transfer the load. It's not the arch shape that
bothers me, it's the welds. Since I didn't do the welds, I'm not sure I
want to trust my life to them when a "straight down to the ground" option
exists.

I'm sure they're fine, I just don't want to be worrying about them while I'm
under the vehicle.

I am glad you understand arches.

I wonder, do you worry about all of the welds you "didn't do"
throughout the course of every day? All of the vehicles on the roads,
airplanes, trains, elevators, staircases, bridges, etc, when you are
in a position to be harmed by a failure?

I bought the shop manual for my 2004 Sebring, and it has 95 pages of
Location of Welds.

I don't understand it. They need to know where the welds go when they
build the car, but when people fix it, how often do welds break? And if
a mechanic finds a broken one, he should reweld it.

He's certainly not going to check out the welds before they break.


It's a "repair" manual. If bodywork is being done and components
replaced, it is VITAL to know where every spot weld is, so they can
all be drilled /cut out, and the repair welds done in all the
specified locations, following the specified repair procedures. This
is to ensure a "crash-worthy" repair.

I hope not.

The fact of the matter is, in modern manufacturing, a great percentage
of welds are made by robotic welding apparatus. Whereas they are not
perfect, I suspect they create welds which are far superior to the
average human operator.
If not "better" they are at the very least "more consistent" -
particularly in location.