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Author Topic:   Trailering: Welding Galvanized Steel
jimh posted 09-04-2002 08:14 PM ET (US)   Profile for jimh   Send Email to jimh  
Can steel that has been galvanized be easily welded? I have a crack developing on one of the fenders of my trailer. The best technique for repairing this would be to close it with a weld bead. Are there any considerations to welding galvanized steel?
JohnAz posted 09-04-2002 08:17 PM ET (US)     Profile for JohnAz  Send Email to JohnAz     
no problem welding,,,just dont inhale ANY,,ANY, of the smoke it will kill you
whalersman posted 09-04-2002 08:36 PM ET (US)     Profile for whalersman  Send Email to whalersman     
jimh,

I see you have double posting on this topic. Maybe you can now figure out why some of us get the same thing by just hitting our "Back Button" on our browser.

I usually quit my browser after posting to a topic so I make sure I do not double post.

kingfish posted 09-04-2002 09:16 PM ET (US)     Profile for kingfish  Send Email to kingfish     
jimh-

Second the no problem from JohnAz - since you can't realistically dip the newly welded area in a galvanize tank though, you just have to do the best you can with coldgal or some type of galvanize paint where the galvanize has been burned away, then be cognizant that the area may have to be touched up from time to time.

Also second the part about not breathing the fumes - chlorine gas or something very close to it---

jcf

Jerry Townsend posted 09-04-2002 09:58 PM ET (US)     Profile for Jerry Townsend  Send Email to Jerry Townsend     
Jim - Suggest that you use a wire brush and galvanized paint on the outside and inside - it will work without a problem. --- Jerry/Idaho
jimh posted 09-04-2002 10:08 PM ET (US)     Profile for jimh  Send Email to jimh     
[Deleted duplicate posting--jimh.]
fno posted 09-05-2002 05:51 AM ET (US)     Profile for fno  Send Email to fno     
Use a SS welding rod also.
WSTEFFENS posted 09-05-2002 12:25 PM ET (US)     Profile for WSTEFFENS  Send Email to WSTEFFENS     
Jim:
No problem. I have had extensive experience in this working on dust collection systems.

Grind (disk not grinding wheel) the galvanize from the crack area both sides. Drill a small hole at each end of the crack to relieve the stress riser. Use a tig welder and SS filler rod. It will make a very strong and good looking weld. Clean up any oxide (white powder) generated by the heat of the weld. Treat the inside and outside with cold galvinizing coumpound such as the product made by LPS. Do not breath any of the fumes of the process.

The LPS product is very tough and carries a Mill Spec for galvinizing. I had a garbage can lid coated with the stuff and it lasted 8 years outside!
Best
WLS

JDH posted 09-05-2002 05:45 PM ET (US)     Profile for JDH  Send Email to JDH     
As mentioned by WLS - perfect. I have done it many times except I MIG weld.

If you do have any serious fumes, drink a pint or more of milk - this helps...

Jim

simonmeridew posted 09-05-2002 07:36 PM ET (US)     Profile for simonmeridew  Send Email to simonmeridew     
I welded the galvanized bracket for the winch on my Montauk trailer earlier this summer. Used 6013, 1/8 inch regular rod at about 120 amps AC. For a fender metal is thinner, so probably use 105 amps. This rod makes a nice smooth looking repair. Weld it outdoors, hold your breath if the smoke wants to go to you, try not to heat it excessively, Paint it as it cools. Not a big issue. Probably a 3 minute start to finish repair.

Might be worth while figuring out why it cracked in the first place as a fender is not a real stressed part. Suggest looking seriously at whether the trailer wheels have been balenced, as metal fatigue from the constant and rapid vibration from an out of balence wheel/tire can lead to metal fatigue and cracks.
simonmeridew

jimh posted 09-05-2002 07:54 PM ET (US)     Profile for jimh  Send Email to jimh     
I found the problem that precipated the crack: the fender is supposed to be bolted to a plywood, carpeted board that protects the hull from hitting the fender metal. The wood acts as additional support and damping for the metal fender. Those bolts were missing; they must have vibrated loose some time ago, as I don't recall ever seeing in place.
triblet posted 09-06-2002 12:14 AM ET (US)     Profile for triblet  Send Email to triblet     
The guy doing the welding better be pretty
good. Thin material is really hard to weld.
A really good welder can do it, but anybody
less is going to just blow holes in it.

A lesser welder who knows their limitations
will braze it.


Chuck

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