EB weld ss to tantalum
EB weld ss to tantalum
(OP)
I dont have to actually melt the Ta do I
I can just sort of glue the SS around it to seal
Its for UH Vacuum and about 1000C operation
its a 19 dia x 0.5 mm wall Ta tube into a SS Flange ,
My main problem is cracking in about 20% of parts
I can just sort of glue the SS around it to seal
Its for UH Vacuum and about 1000C operation
its a 19 dia x 0.5 mm wall Ta tube into a SS Flange ,
My main problem is cracking in about 20% of parts





RE: EB weld ss to tantalum
RE: EB weld ss to tantalum
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
for contamination reasons ,
I just have a close fit
RE: EB weld ss to tantalum
Since you didn't provide a photo or a drawing, I'll hazard a guess that you're fillet welding what is a really thin wall tube to a relatively massive flange, and they're cooling at substantially different rates after welding.
In which case, I'd machine the flange from a thicker blank, and make the backside with a thinwall 316 'tube' projecting from it, so the weld can become more like a pipe butt weld, and the halves of the joint will cool at more nearly equal rates. Sort of like an ANSI weld neck flange, but with a much less massive neck.
Mike Halloran
Pembroke Pines, FL, USA
RE: EB weld ss to tantalum
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
its done in vacuum of course
60's EB Welder
The tube is a tightish fit in the flange
so on one I melted the Ta and SS together in a big weld and it looks like a good vac seal and heat seal ,
(1000C),
and seeing no mechanical strength is required
I feel it will work even though the mating of these materials as I say is a very poor alloy
RE: EB weld ss to tantalum
The most effective method for producing a joint between 316 cres and Ta would be to use some form of diffusion bonding process. A controlled application of temperature, pressure and vacuum.
RE: EB weld ss to tantalum
I will look up Diffusion welding
I can arrange temp, pressure and vacuum here