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Found a paper that said this weld area has such low tensile that a test piece cannot be machined into a tensile test piece But we have it sealing at 1000c and Ultra high vacuum , just so long as you do not flex the welded area,, or it will crack

I got a weekend running out of a normal model plane Brushless, motor , bronze bushes substituted for ballraces Flushed in tap water , so far OK , running at approx 1 metre depth , thats about the limit of my 36 Megahertz radio reception

Thanks Mike I will report if my ESC or motor dies on operation

Ugh ,,,,, Has to be a no oil flush as residue would contaminate my pool with oil film ,

Maybe a demin Water flush ?

No No silicon near the brushes I did get a good 5 minutes each of performance before both brushed motors died Fully submerged Have now a 40A ESC and a Brushless innrunner on with bronze bearings substituting the ballraces, no pool time yet This has been proven in tap water , dont know...

And what do you mean computer fan , this is an evil big , nuclear sub 700 mm long , about 2.5 kg , it needs power to push that blunt nose

Thanks mike I am going Brushless , my question is will the speed controller be OK with its 3 wire in the water The water resistance wont confuse it ? and the back EMF for the motor timing wont get thrown out?, I hope not Subs for a kids charity have a go meet

We all know brushed motors in fuel tanks last 1000 's of hours Why then with my brushed motor in my Radio Sub is the brush life about 5 minutes , Chlorinated pool water ,,, low power Suggestions appreciated

Have an 18 bolt flange heated to 200 C Taken apart often would silver plated 5/16 UNF be better than Grade 12.9 Cap screws with hi temp lube ???? Thanks

Well I learned that you separate the phase wires coming out of the core, if you sort of bundle them they can get hot there,, also vacuum impreg has no place in air cooled model engines as you want the windings open to air cooling not suffocated with epoxy

Ron To my reading it was how the aussies bundled the wires out of the generator that got an overheat in this area also they did the vacuum impreg of the windings which was not quite right as I heard , also , gee they should build a few high power model plane electic motors to learn a few things...

Tbuelna Thanks by CTE do you mean matl expansion difference You know that SS is joined to Aluminium oxide for high vacuum and up to 250 Centigrade temperature application, That type of strain relief method would work In that case a braze matl is used , I wish to join the Ta to SS...

Has this failure been discussed here , wondering

Yes , vastly different melting temps These work in Ultra high vacuum and 1000C What Im doing is joining SS to tantalum pretty well , It must be a braze In 20% of parts I get cracking and the SS, just a does not join to the Ta , I dont know why Its not a metallurgy problem , just a...

Thanks I will look up Diffusion welding I can arrange temp, pressure and vacuum here

Denlow Its probably more correct to say that 316 is non magnetic only after annealing 316 in my hand now has an Eclipse magnet 25 Dia x27 long hanging upside down on it I also have a 316 conflat flange,that does the same

I did post in Welding , but here might be better Im trying to get 316 SS to take or braze or glue to Ta it seems to work in most cases is there a matl I can use as a filler to enhance the bond I have used tantalum in the moly to moly bond and found that was good

Yes , thanks Similar sections , will try and get a picture But I read that actually melting SS and Ta together makes a very weak matl so you either use a filler type braze or if not I sort of try and flow the molten SS over clean Ta and amazingly it glues tight , mostly, hope hope...

I mean is it actually possible to do what Im doing getting 316 to braze,,, weld,,, ,,seal,,,to Tantalum for an Ultra high vacuum seal at approx 1000C operation These parts are in service working , but I dont undersand if Im brazing SS to Ta or welding to it No brazing matl is used at all...