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Tractor Talk Discussion Forum

tig welding diesel tank.

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franget

04-24-2007 08:47:42




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Has anyone tried to fix pin hole leaks in a tef 20 diesel fuel tank using tig.Are the explosion dangers similar to petrol?




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135 Fan

04-24-2007 16:11:13




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 Re: tig welding diesel tank. in reply to franget, 04-24-2007 08:47:42  
Yes you can TIG weld it. It could have a fire but not like gasoline. It would be best to steam it out first or at least flush it a few times with the hottest water you can. Welding actually melts and fuses the metal together unlike soldering that just fills in the pores when heated. Semi tanks are welded all the time. It's not too big a deal. Talk to a shop that does them. You need to use Aluminum TIG rod to weld aluminum fuel tanks. Vibration and cracks by the clamps are common. I've welded a few but know people that have done lots including aluminum oil pans mostly for Cummins engines and aluminum semi wheels. It's not uncommon for the valve stem to get welded up and a new one drilled. Dave

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mjbrown

04-24-2007 15:42:41




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 Re: tig welding diesel tank. in reply to franget, 04-24-2007 08:47:42  
I'll bet the pin hole will grow to many times it's size when you touch the tig arc to it. I think solder done with an iron is the safest and most practical way to fix this. I don't like the idea of an open flame or arc on fuel tanks but if you think it's worth the risk.



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franget

04-24-2007 15:18:30




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 Re: tig welding diesel tank. in reply to franget, 04-24-2007 08:47:42  
Thanks for all the advice will give it a try tomorrow.Would tig not be more durable than solder.



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Powerfarmer

04-24-2007 14:47:08




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 Re: tig welding diesel tank. in reply to franget, 04-24-2007 08:47:42  
Just Tig welded a cracked MF 590 diesel tank.
Make sure tank is fully drained, purged it with argon whilst welding and used a 316 stainless filler wire,
it turned out great.



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Fred Wolfe

04-24-2007 13:33:25




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 Re: tig welding diesel tank. in reply to franget, 04-24-2007 08:47:42  
I just recently brazed a diesel tank on knipco heater, but solder may be the best. Get tank to hot it will warp. I took cap and drain plug out, then blow air in from air compressor to get smoke out while brazing.



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Thunderr

04-24-2007 09:57:05




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 Re: tig welding diesel tank. in reply to franget, 04-24-2007 08:47:42  
If its a pinhole just use an epoxy of some kind. Theres all kinds of compounds like this these days, made just for this purpose. Just clean it good and apply, you'll be done in minutes.



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edj856

04-24-2007 09:26:31




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 Re: tig welding diesel tank. in reply to franget, 04-24-2007 08:47:42  
You can TIG weld the tank, but I would recommend steam cleaning the inside of it first, if possible. If you can't, it can be welded but you will most likely have a fire inside the tank. You can also weld on a gas tank after you have thoroughly steamed the inside of the tank with some 250 to 300 degree water. You can also MIG weld it, but it's easier to get a leak free weld in a single pass with a TIG. I've repaired several tanks, both gas and diesel, with MIG and TIG.

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Mike M

04-24-2007 09:09:51




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 Re: tig welding diesel tank. in reply to franget, 04-24-2007 08:47:42  
I would think soldering will be easier on that thin metal.



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davpal

04-24-2007 10:59:38




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 Re: tig welding diesel tank. in reply to Mike M, 04-24-2007 09:09:51  
You are 100% correct on the soldering. I just did it to fix a pinhole leak on the oil pan on my car. I cleaned it up with a dremel tool, cleaned it off with laquer thinner, barely touched the torch to it with the solder and it was done in two seconds. Bonded very perfectly and made a perfect thick splotch right over the hole. It only takes seconds if the pan is dry.



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TimWafer

04-24-2007 09:04:33




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 Re: tig welding diesel tank. in reply to franget, 04-24-2007 08:47:42  
Ive done it several times with my mig welder. As recently as yesterday as a matter of fact. Ive even cut holes it old fuel oil tanks with a torch. Remaining remnants of fuel caught fire but no big deal.



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