[TheForge] gas tank repair

[Charles]

I would suggest after repairing it to fill the tank with gravel and shake the devil out of it to remove any loosen any remaining rust.  They also sell a liquid tank sealer I would suggest as well.   Motorcycle shops will sell it.  This can prevent the problem from coming back.

Charles

> On Jun 22, 2017, at 10:12 AM, Dan Brewer <danqualman at gmail.com> wrote:
> 
> Suggested repair. Remove tank from unit. clean the inside with a solution
> of hot water and TSP.  The TSP will remove residue from the inside of the
> tank.  Locate the holes on the tank an clean the area around them with a
> mechanical action.  , I have used a flap sander with 200 grit If you can
> fill the tank with an inert gas that will reduce the chance of explosion.
> The use a good flux and an acid core solder. depending on the size of the
> hole you may need a patch. or consider replacing the entire bottom of the
> tank.  If replacing the bottom of the tank cut the bottom out leaving a lip
> that will allow you to use this tool on it
> https://www.harborfreight.com/air-tools/specialty-air-tools/air-punch-flange-tool-1110.html
> . This will give an edge to solder on.  I use this flux with great sucess.
> http://www.homedepot.com/p/Oatey-1-7-oz-Lead-Free-Tinning-Flux-303742/100347302.
> I would use an electric soldering iron like this one.
> 
> https://seattle.craigslist.org/tac/tls/6180917690.html
> 
> Have fun with the repair
> 
> Dan In Auburn
> 
> 
> On Thu, Jun 22, 2017 at 7:15 AM, C&J Allcorn <jallcorn at suddenlink.net>
> wrote:
> 
>> I've got a maybe 40-50-60 year old SA-200 welder and discovered a leak in
>> the bottom of the gas tank recently (obviously caused by years of
>> condensation, rust, etc.).  It's a good old stick machine and I'm going to
>> need it for a fencing project out on a ranch in the near future.
>> 
>> I looked up the cost of a new tank and I'd rather take a stab at repair
>> than replacement.  Haven't taken the tank out yet so don't know how large
>> the affected area is but suspect if it has rusted thru at the lowest point,
>> that likely there is a "rust-affected" zone adjacent, probably at least a
>> couple inches in diameter from the actual hole.
>> 
>> I'll probably either fill it with water to weld/braze/solder - whatever -
>> due to potential explosion hazard or possibly inject nitrogen.
>> 
>> The metal is probably pretty thin and while I'm a pretty good hand with
>> TIG, I know my limitations, especially on really thin stuff.  So that
>> leaves braze or solder?
>> 
>> What's the best way to repair that gas tank?  A patch of some sort?
>> 
>> James
>> 
>> Paris, TX
>> 
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