Watch speed "tables" not bumps - Page 6 - Fiberglass RV


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Old 10-16-2015, 03:38 PM   #71
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I deal with the rust issue by painting my hitch every year with rustoleum. At the same time I check everything for tightness.
Yup I tend to do that as well but in the case of the hitch I removed there was something clearly not right about it - possible paint issue at the factory.
Level & extent of rust appearing on it was not normal.
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Old 10-16-2015, 04:15 PM   #72
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Carol's hitch situation sound like the manufacturer skimped a lot on the coatings used.


The now 13 y.o. GM factory hitch on my Blazer has a little tiny speck of rust where the safety chain is attached, otherwise the coating is like new, ditto on the GM hitch on my then 10 y.o. Sonoma.


A weld is an oxidation process and it gives it a great place where rust will start. Even the earlier mentioned tack welding of the bolts will provide a small place for rust to start. I would go down to bare metal, cover with several coats of rust converter (Rust Mort?) apply a known quality undercoating, and done is done.
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Old 10-16-2015, 04:35 PM   #73
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Actually welding is the process of joining two pieces of metal while preventing oxidation either with shielding gas or flux. Steel will just burn in the presence of oxygen. No shielding poor to nonexistent weld.
Automotive engineers used to consider welds low reliability joining where they trusted bolted connections more.
Proper torque and design produces a good system.
Welds can be good too, but only when done properly.
As for coating a good prep and epoxy powder coat will last a long time.

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Old 10-16-2015, 06:44 PM   #74
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Carol's hitch situation sound like the manufacturer skimped a lot on the coatings used.

Yup that was defiantly the case. Which why the manufacture agreed to replace it and paid for the labour to do it.
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Old 10-16-2015, 09:29 PM   #75
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Actually welding is the process of joining two pieces of metal while preventing oxidation either with shielding gas or flux. Steel will just burn in the presence of oxygen. No shielding poor to nonexistent weld.
Automotive engineers used to consider welds low reliability joining where they trusted bolted connections more.
Proper torque and design produces a good system.
Welds can be good too, but only when done properly.
As for coating a good prep and epoxy powder coat will last a long time.

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Old 10-16-2015, 10:16 PM   #76
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Oh Well, I guess all that oxy-acetylene welding I have done is about to fail because of all that oxygen we used and we didn't shield the bead from inert oxygen along the way. And I believe that the flame itself was also a form of the reduction/oxidation process aka redox.

But I'm OK just knowing that a surface will have to be protected from future rust damage after welding.
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Old 10-17-2015, 07:08 AM   #77
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Actually the weld WAS shielded by the CO2 from the Oxy-Acetylene flame. The shielding gas is the product of combustion.
If you remember if you adjusted the flame oxidizing then the excess carbon was burned out of the steel and the weld was hotter, but perhaps not as pretty.
The combustion gases from a neutral flame is what shields the weld and makes pretty welding possible. Deeper in the puddle the Purer the metal. Try electric welding without shielding from flux or gas.
There is no inert oxygen I know of. Being a certified aircraft welder with an A&P license with Inspection Authorization I know a small amount about welding.
frame
It is but this is a place where these parts should be joined by bolting. I would guess that very few hitches are welded since it would be difficult to make sure that it met design specs where the strength of a bolted unit can be determined closely.
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Old 10-17-2015, 02:46 PM   #78
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Also I meant to add you can't be sure about the alloy of today's cars and frames since HSLA steels or other fancy stuff could be used.
The HAZ or heat affected zone and cracking just outside of the weld is a real possibility. Welding on the new high strength steel frames is not allowed.
Most or for that matter all modern cars and hitches bolt on for that reason.
There maybe some that weld on, but there can't be many.


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Old 10-17-2015, 02:57 PM   #79
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That may well be why the first two shops turned down the job....
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