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Welding /2 cases
- deyoung2837
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Welding /2 cases
Thanks for any information,
Lee
- caker
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Re: Welding /2 cases
From my friend Kevin in Germany:
he's asking if my broken R5 head has "ALG2" or "ALG3" foundry mark. I'm guessing all later post-war castings were ALG3 or even better/newer, but read Kevin's info below about welding BMW castings and gotchas and what rod to use:
HTH,<Kevin> Alg3 or ALG2?
Alg3 is good weldable
ALG2 has more Cooper in the alloy . Weldable but gets worse
S3300 = more Cooper = super pain from the Backside
Tell the welder He shall use AlMg5 full rod !
AlMg3 also okay
Most people think they weld Casted stuff and AlSi3 is the choice but they fail
This Cast is Like hard Alu ....so AlMg fill rod flows like cream!
And almg Looks perfect in the end
AlSI makes pores
-Chris
- jwonder
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Re: Welding /2 cases
That information is gold!!! That will help all of us going forward!
Vice President, Vintage BMW Motorcycle Owners
2022 BMW Friend Of the Marque
Long Island, New York
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Re: Welding /2 cases
I collaborated with the apps engineers at Alcotec and for BMW pre-70 cases welding repair, and other BMW cast aluminum parts, and the recommendation was to use ER4145. It is more expensive than some other filler rods, yet the cost difference is negligible when factoring in ER4145's capability. The flow with it is excellent. The downside....Alcotec/ESAB has discontinued offering ER4145. Search around and it can be found.
It should be noted, different filler rod materials should be used for different engine case repairs types. The type of repair, structural vs. cosmetic, will determine what is the ideal filler rod. Repairing a nick, gouge or surface blem can require a different filler rod versus repairing the engine case rear M12 mounting bolt feature.
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