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I got this from a welding web site but is basically what I am doing:

TIG Welding

1. Good process for thin metal � very clean process producing good looking welds.
2. Use Argon shielding for steel, stainless, and aluminum.
3. Use DC-Straight Polarity (DCEN) for steel and stainless. Use AC for aluminum.
4. Always use a push technique with the TIG torch.
5. Match the tungsten electrode size with the collet size.
6. Aluminum � use a pure tungsten, AWS Class EWP (green identifying band). Will form a balled-end in AC.
7. Steel and stainless steel � use a 2% thoriated tungsten, AWS Class EWTH-2 (red identifying band). Prepare a pointed-end for DCEN welding.

Keep in mind not all aluminum is weldable. I am using 6061, pure argon, AC and the green tungsten tips.

Gary
Gary,

I'm also just setting mine up TIG ... I was wondering if you could use the AC for all of them ??? I have all the TIG equipment but missing some small adapters.

I have to say the most vercitile welder is the MIG... then they have a Spool gun for Aluminum. I think becuase the wire is too weak to push thru.

I also need the TIG for the root pass on Heavy steel pipe. It gives a clean first pass on large Steam and Process Pipe then we cap it with the 7018 ARC.

Thanks for the info...I have been in contact with Miller they have been very helpful.

Ron
Here is the best tip I can give anyone trying to tig weld aluminum. Make sure you have a clean joint to weld. What I mean by clean is to wire brush off the outside oxide layer of metal. Aluminum oxide has a lot higher melting point than pure aluminum. If you have a heavy oxidation build up on the surface and try to weld it it will suddenly flow all over the place because the inside melted before the outside. If you take just a little more time in preperation, you can wind up with welds that look like you oxyaccetalened them. In other words, smooth, even and strong.
Welded up an aluminum block yesterday that was 8" wide and an inch thick. Cranked the sob up to 165amps! It was a plate that had broken. I ground a "v" where I was welding to get complete penetration. Clamped it with angle iron to keep it straight. Worked like a charm! We milled it back flat and looks like it was never broke. I never imagined at that kind of current my ears were ringin when I was done from the noise!

Hot D*M% let's weld up some intake manifolds!

Gary
LPB, too many ideas, not enough focus really. My 434 stroker I am going to start with Demon carb. I have the chi head and adapter plate's. I was thinking of starting with the adapter plates and maybe fabricating an entire intake. I don't know. The other thing is my webers. I will switch to webers latter so I may fabricate a new intake for those. I have the Hal Pantera intake but again I am using adapter plates for the 400.

I Tig's the exhaust on the MGB and that went real well!

Gary
Gary are you gonna have to notch your rear deck to get the webbers to fit? If you are anyway, you may consider just making your own tunnel ram intake, a plenum chamber on top and two demons instead of just one. Top it off with the shelby oval air cleaner and you have a monster!!
quote:
Originally posted by comp2:
Welded up an aluminum block yesterday that was 8" wide and an inch thick. Cranked the sob up to 165amps! It was a plate that had broken. I ground a "v" where I was welding to get complete penetration. Clamped it with angle iron to keep it straight. Worked like a charm! We milled it back flat and looks like it was never broke. Gary


I was always told that you need to heat the block with a gas torch prior to attempting that kind of repair?

Jeff
6559
Saturday I TIG'd a transmittion case for a HARLEY and yes it makes for a better job to preheat Aluminum. The reason is if you do not preheat the material around the weld, the material when welded, losses it strenght by as much as 40%. If you preheat you could actually strenghten the area and the weld which is usually WEAKER then the area around it.( Unlike steel where the weld is usually stronger, not aluminum. Aluminum weld is usually weeker thenm the area around it.) So if you desire strength ... preheat the area around 400 degrees. A simple propane torch very lightly.
George the welding we do is more high quality stuff like BILLET and HEAT TREATED stuff .. we know that aluminum welds are weeker. Oposite of steel theory. CAST ALUMINUM Ok you got me .. I'm not 100% but BILLET and HEAT TREATED ALUMINUM I'm 100%.... but why wouldnt CAST AL. be the same... and think about it. I say WE because I only put dollars to the process we perfom on a job. So I have to know the process to estimate how much time. I cant say I'm the expert.
LOL.........

Ron, I'm just the opposite. I've never had anything billet welded! Just castings. The welders have never pre-heated the parts, and have always said the repair was stronger than the original. Probably the most stressed aluminum parts I've had repaired are wheel hubs for off road motorcycles. The repairs never failed afterwards.

I can see the need to pre-heat a tempered material, like 6061-T6. I doubt there is a need with a casting. I'm tempted to go read up and resolve this, but I'm a bit busy tonight and through the weekend.

It's getting cold, better jump back in the hot tub. take care my friend.
For the purpose of info and learning,

Preheating

The need to preheat aluminum prior to joining depends on the welding process, type of alloy, its thickness and ambient temperature. In general, it is accepted that preheating is not usually required with MIG welding until the material thickness exceeds 25 mm. However, some preheat, i.e., 150-200°C will be found beneficial from the point of fact of improving weld quality (with respect to porosity) on material thicknesses in excess of 9 mm.

For AC TIG, preheating is necessary when sections greater than 3-4 mm are welded, to aid fusion without the need to use excessive welding currents.

Just something I found on LINCOLN's site ? Our spec books have info ususally specific to a certain use on a project so they are not really beneficial. I find they are the WISH LIST for something an Engineer dreams up at night that he would like to see in a process. But then cost soo much money that the spec is scraped. So I pulled some thing generic.

Ron
quote:
Originally posted by comp2:
Hey DeTom,

I saw that. I have more intention of playing then in need of a solution. What I have will work I just wonder what I can do if you know what I mean.

I flew down to the keys thismorning. I am typing in the pilot lounge. I probably won't be back on till tonight.

Gary in Indiana...Well not at the moment!


Gary sounded to me like he would just give it to you in exchange for a promise from you to run the silver state classic. Wink
I would love to do something like that. Unfortuantly I can only do so many things. Since I am my own mechanic (with 4 sports cars) I have half of the rest of my statistical life left just catching up (with no delays).

Actually, the goal is to get the 434 in #1905 so I can start driving it. Then do full nut/bolt resto on #1280 (hopefully begining by years end). When #1280 is driving, then break down #1905 and prep it in a way it could be run hard on a track........And mow the grass in between. Damn job just get's in the way of everything!

Gary
Gary are you just practicing? I mean that would have been easier for you if it had been made out of steel. I bet you are practicing so you can make the worlds first and only aluminum bodied Pantera aren't you?? Admit it. That is what you are up to. You are going to make a Pantera completely out of aluminum, aren't ya??? What some guys won't do to become famous, I'll tell you. So now we will have another Chip Foose, only from the Pantera world. Well I guess I will be able to say, I knew him when he was just another Pantera guy. Remember us when you get your own tv show. OK???
Ha, I am a chip foose in slow motion. It only takes me 10 years to do what he does in 7 days. Truthfully, he has a lot more vision then I will ever have (even though I don't care much for his wheels). His wheels aside, he has more vision in those 7 days then many of us do in a life time!

I thought about steel but don't you think a radiator over flow would be better out of aluminum? I am going to re-do the clutch tank. I may have some issues the way it's built. I can get the cap on/off unless I twist the tank. In doing so will jepordize the seal. I have been antagonizing over what I need to do and have finally come to the conclusion I just need to re-do it. We'll see how the second one comes out.

Gary
quote:
Originally posted by comp2:
Ha, I am a chip foose in slow motion. It only takes me 10 years to do what he does in 7 days. Truthfully, he has a lot more vision then I will ever have (even though I don't care much for his wheels). His wheels aside, he has more vision in those 7 days then many of us do in a life time!
Well Gary I have seen overflows made of about everything including plastic. So I think it is great you made one out of aluminum, because it is giving you the experiance you will need to fabricate all aluminum body panels for the Pantera, which will sell like hotcakes and make you rich and famous. Smiler
I thought about steel but don't you think a radiator over flow would be better out of aluminum? I am going to re-do the clutch tank. I may have some issues the way it's built. I can get the cap on/off unless I twist the tank. In doing so will jepordize the seal. I have been antagonizing over what I need to do and have finally come to the conclusion I just need to re-do it. We'll see how the second one comes out.

Gary
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