All of that aluminum soldering stuff is junk. I wouldnt use it to fix anything I needed to say fixed. Your best bet would be to use a thread insert or weld the hole up properly and drill/tap. That huge aluminum case will pull heat away too quickly to get the type of heat he was able to manage in the video. Either way, I have used this stuff and its crap.
This is not the same as the ordinary alu solder you get at walmart. insert was first option but when the hole got to large there was only 1.8mm left of aluminium in the hole after the big-sert (that was like 110$ with shipping and import) We heated the block up in a owen to 250C (notice the color on it) and the meltin point of the solder is 380. used propane with oxygen to heat it the rest of the way. it probs took 10mins tho. the solder wasnt cheap either, 30$ and it was just enough to fill that hole and repair that fin.
I don’t think I’d use an aluminum “solder” to fix threads. They would have no strength for torque beyond a few ft/lbs.
Tensile Strength: More than 78 Newton / mm2
Hardness: Rockwell B 55-62
Extension: 4-9% depending on cooling conditions 380ºC
Breakout Limit: More than 78 Newton / mm2
Ref: KTH in Stockholm and Linköping University
Corrosion: Ref: Corrosion test test et. SS. 150 3766, Ref .: 53390/2
applications
Assembly of aluminum and aluminum alloys of all shapes, including cast and zinc alloys.
Alutite is able to "build with".
Alutite can be reprocessed with advantage, for example, drilling and threading.
Alutite can be reused.
Alutite is lead- and cadmium-free, thus meeting the requirements for joints that come into contact with food and drinking water.
Alutite is inoxible. Eloxation and paint must be removed before work.
