Does anyone know the correct welding rods to repair engine parts, and the correct welding rods to use for Aluminun body repairs? Mig and tig.
Thanks.

 

I have used a product called alumaweld for repairing aluminum block on r/c racers. Worked very well.

 

I have at least some of the info you want. The download I put up in the link below isn't available any longer, but I can find the stuff and email it to you if you would like. Let me know.


https://rennlist.com/forums/928-foru...made-from.html

 

It depends on the type of aluminum you are going to weld. You can stitch weld the panels with a mig welder, useng CO2and ARGON, mix 30/70. .035 wire size. Heat control and wire speed is very critical.
Engine castings must be HELI-ARC welded. Would need to know if materal is a casting or billet materal. Also type of aluminum alloy, (rockwell hardness scale) etc. Aluminum was never ment to be welded, but as you all know it is welded all the time. I do most of mine in a purge box, with a submergeable-arc. I've been certified over 40 years. This is something thats best done by a pro. FWIW, Joe. P.S. Material must be clean, and I do meen CLEAN! also material needs to be pre heated. You may have to lay tac strips on the panels to prevent warpage.

 

Thanks for the replies. Very nice info guys.
Has anyone used 4043 or 5356 rods?
I do not know the European alloys.
Standard for me is welding on 6061 for structural fabrication here in the US.
Did Porsche cast thier own alloys for any 928 parts?
Thanks.

 

You'l find that 4047 is a good rod to use, it is about 12% silicon so that is getting close to the blocks silicon of 17%, there is no rods I know of that are 17% and this rod will flow well and should give a nice none porous finish. The bedplate is made from a different alloy and is not of the same quality. It can spit a bit as it is not such a clean casting as the block is.

I have had some success with repairing our blocks however I did not weld them, in this case I just supplied the filler wire. My welders also use a argon helium mix. These guys are aircraft welders and know there stuff but by the sounds of it so does Polecat702, so I would like his opinion on what he thinks of my suggestion.

Greg

 

This 32 page PDF document from Lincoln Electric will help you with aluminum Filler Rod selections. It is based on MIG, but filler rod sections would be similar for TIG.

http://content.lincolnelectric.com/p...ture/c8100.pdf

 

Good morning guys, OK first, Greg is on the right track, and I too am aircraft certified. I work in the Nuclear industry. I'am superentendent of containment construction, Yucca Mountain, Nevada.
Aluminium (ACHF) Filler material can be either wire or rod.And it must be compatible with the base alloy. 1/16-1/18, fillit or butt welds, 20PSI, ARGON. 3/16-1/4, fillit or butt welds, ARGON/HELIUM. I don't think you will be getting into anything larger, material size. Small amounts of impurities, particularity oxygen and nitrogen, cause embrittlement of molten or hot aluminum. The molten weld metal must be shielded by a blanket of inert gases. Aluminum requires a positive pressure of ARGON or HELIUM as a backup on the root pass weld, as well as long, trailing, protective tail of inert gass to protect the metal while cooling. Purge chambers and trailing shields are best in providing quality results. I've listed some of the more common rod and wire that may be used, depending on you're application.
7075/ 2024/ 6061, E4043 is a flux coated rod for ARC-WELDING. TIG FILLER ROD 3/32 4043, and 1/8 5356 Aluminum alloy rod. Again I stress that the material must be clean, CARBON TET. was the best it is no longer available, acetone will work. Welding aluminum takes lots of practice, I think that you should have the work done by an aircraft certified welder. QAlso sometimes it's better to buy new than to try to repair a critical part. IT could result in taking something else with it, "YOU". I hope this little bit of info helps. Best Regards, Joe

 

Thank you very much. You guys are fantastic.