Hello Fritz, if it is indeed titanium, then all of it is titanium. It cannot be welded with stainless steel filler and it can't be welded to stainless steel. Additionally there are many grades of titanium and they are pretty much grade specific and require matching fillers to be welded correctly. Titanium offers similar strength of steel but is two times lighter and offers a amazing corrosion resistance. Grade 1 is the most pure type and is mostly welded with.
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I'm attempting to join 3al-2.5v titanium to 17-4/630 stainless steel. The titanium is a tube and the stainless will be simple caps machined to fit in the ends. The bond will need to be heat and pressure resistant.
I can do the math to get the precise heat and pressure if necessary. I'm thinking that brazing is probably going to be the best way to handle this situation. I would like a suggestion for a type of brazing rod and flux to use.
Does anyone have experience joining these materials? What rod do you use? What about a rod to join the titanium to 6061-T6 aluminum in the same manner?. My advice: Cut the Tubes shorter, then weld a flange on both the tubes and caps and bolt the suckers together.Titanium can be welded to stainless using a Zirconium or Vanadium buffer layer.
So you would have to weld a layer or two of Zirconium on your Titanium, then weld your stainless to the Zirconium. Welding titanium is difficult because Titanium oxidizes above 700F and gets that blue/gray/black coloring, which is terrible for mechanical properties. To counteract the oxidation in welding you use Argon shielding gas. You don't have that shielding in brazing (and you're literally blasting oxygen all over your part) so I really don't recommend brazing. Thanks for the suggestion. I don't think I can do flanges but this has made me get my head out of the box and realize that I may be able to employ some machine screws to hold on the end caps since there will be some material inside the tube to which I could anchor them.
![Stainless Stainless](/uploads/1/2/4/1/124147375/228558576.jpg)
I could even punt and use titanium plates for end caps in an attempt to work around the issues with dissimilar thermal expansion of the stainless and titanium.Now I'm off to research a machine screw material that can withstand the heat and pressure of this application. It probably goes without saying but I'm really wishing I had chosen different materials. I was thinking that since most of them were free since they were lying in the scrap bin, I could save some $$. I may end up spending so much time figuring this out that it would have been better to just buy more agreeable materials in the first place:).