Welding Of Tubes Of Titanium Material With Tubesheet Of Carbon Steel

Very carefully. I too, would post as an AP asking this type of question. If you don't know, then you probably shouldn't try it unless experimenting.

I don't think it is done.

Where would one use Ti and CS together?

Makes you kinda wonder where their coming from, School, Country, or ....., Huuuh?

If it's out of the wood work, then I think the Orkin man should get fired, he missed a big manifesting

It's the price of fame.

Kinda like feeding stray cats, or squirrels.

Word soon gets around that there's an easy mark nearby who will feed you. Then, the flood gates open and you've got cat fur everywhere.

Hasn't anyone actually got a sensible response?
Yes it may be bonkers or impossible, but for pities sake someone tell him why!
Not my field of expertise.

.. but when I asked about welding cast iron I got some help.

Maybe it can be done with lasers, I know they can do some pretty fancy stuff with laser welding.

C'mon guys, this isn't a homework question... at least give the guy the courtesy of one decent answer.

Del

(BTW who's feed in' the cats? ...)

No.

Like I said, I can not imagine where anyone would use an exotic metal like Ti and carbon steel together.

I've seen process equipment built using Ti, (and Hasteloy and other exotics) and the use of mild steel in the same environment is never done, to my (limited) knowledge.

There may be some way to explosively join the two, as is done with Ni and Cu to make coinage, but.............................................................

Welding? I don't think so. Why would you?

"Welding steel with titanium is very difficult due to the low solubility of iron in alpha titanium at room temperature. When titanium is welded with steel the intermetallic phases TiFe and TiFe2 form, which are very hard and brittle and prevent the production of technically useable welds."

If he really doesn't know why, then he/she shouldn't should be trying it.

Let us all pray to the Metallurgist up above, that he/she doesn't hurt or kill somebody in the mean time.

And would you degrade something? Ti is worth the weight in Gold in my neck of the woods Besides all the chemistry with it.

Del, I have a lot of respect for you. But dissimilar metals don't get along too well when married together, especially a shotgun wedding. Bill Gates and a ........ street walker?

Maybe Windoze would be the better for it....

Cheers,
I can imagine that working just fine

I take the point, but I just felt some sort of explanation was in order.

I really hate the "If you don't know, then I'm not going to tell you"... type answer.
Ok we take it from the wife when we've upset her... but shouldn't need to on an engineering forum.

Del

<rant>

It is troubling how many original posts here on wetted materials get no reference to the wetting fluids, temperatures and pressures at that juncture. It is almost as if there is no concept as to why these things are of any particular relevance whereas they are a fundamental consideration that can have a profound impact on the way that the thread develops to form the route to the answer. One wonders how many newbies and APs wander off, almost along the lines of wondering what that(this) lot are actually on about and why, possibly wishing that the question had never been asked.

"I'm a 'Mechanical Engineer'. I don't do liquids; if it's not metal then I ain't interested. I do spanners, 'ammers n' welding rods n' stuff."

</rant>

I've pondered both your's and Del's reply's over the last few days. The reason why I was so quick to respond was the OP didn't do any basic research. Dissimilar metal marriage has been the bases for mechanical thermostats for almost 100 years now. They get bent out of shape when any heat is applied, (typical marriage) (no pun intended). Unfortunately, this isn't welding cast iron and depending on the application, it could lead to some disastrous results. We've all had to do our own home work in the pass right? And I still find myself doing home work,(even with the internet). Is it fun? Not really, but the information I find while researching is insurmountable. Today's age is too quick to jump on the "net" half cocked and not really understanding what they're asking or let alone what they're trying to do. That has nothing to do with this OP, it's just something we see all too often here on CR4.

You got home work questions? Or if your lucky enough to have parents that can buy you the latest greatest "smart phone", well who needs to study? Just Click on CR4

Sometimes, there's more to it than just striking an arc and fussing some metal together and that's where basic research comes in.

I'm done with my rant now.

Dan

Bill Gates and a ........ street walker?

Richard Geer and Julia Roberts worked out pretty well.

The concept is bizarre. The wetting fluid each side of the tubesheet is of particular interest, for if both are compatible with mild steel then something exotic like titanium is not necessary and if one or both fluids are requiring titanium then the mild steel tubesheet is the wrong choice of material. So please give an indication of process fluids, their temperatures and pressures.

Tubes are often expanded into tubesheets, making welding unneccessary.

Quite a conundrum, this one, which is why the answers have been apposite so far.

If you are at all serious about it then I suspect welding flanges on to each and bolting them together might be the way to go.

Like this?

Not exactly what you need but maybe half way there.

CS to Titanium welding is not compatable

You can refer AWS welding Hand book Vol 4 for the joint configuration Which will clear your doubts

http://www.tifab.com/pdf/Titanium%20Hydrocarbon%20Engr%20article.pdf
http://www.millerwelds.com/resources/articles/TIG-gtaw-titanium-welding

Titanium clad carbon steel plate and titanium tubes are better choice.Weld with manual GTAW or Orbital welding. I found one GTAW WPS&PQR for titanium welding (out of chamber) in my database.

Yes, you are right. Cs plate with Ti cladding. But then the orbital weld ( seal weld is Ti Ti, Gobolar or spary transfer.But never Ti to Cs). Tubes shall be expanded in the tubular plate.

If OP need holes on plate to make it as tube sheet or tube plate or plate with holes, then he/she has to procure raw materials accordingly

Not much info. is available from OP's description. In case, OP's tube to tube sheet joint is expected to carry longitudinal load instead of expanded tube portion.In this case, seal weld is enough to serve the purpose?

Explosion bonding is the only known means of bonding certain dissimilar metal combinations on any commercial scale. Hot roll bonding offers another means of bonding certain composites. However, titanium (or zirconium) clad steel components with steel properties that meet pressure vessel specifications cannot be made by this method. The reason for this is that titanium and steel form a brittle Ti/Fe phase at temperatures above 750°C which prevents bonding during the hot rolling process. Similarly, titanium/steel composites bonded by other means, including explosive bonding, will also disbond if heated above 750°C, again due to the formation of this same intermetallic. Consequently, it has also not been possible to produce explosively bonded slabs that can be hot rolled, with this so called "bang and roll" method. Attempts have been made to roll bond using interlayer materials that are compatible with both titanium and steel, but all have fallen well short of expectations, as the nature of the interlayer materials have, themselves, restricted the temperature at which the materials could be rolled, which thereby prevents the required steel properties from being attained. The lack of alternatives has meant that the only possible means of producing titanium clad plate, over the last 50 years, has been by explosion bonding, at the final required size, of individual pre-rolled titanium and steel component plates. The clad produced commercially in this way, however, is labour intensive and has severe limitations in terms of both size and quality.This situation has now been radically changed by the advent of a new process, developed by Sigmabond Technologies Corporation, in which the technologies of explosion bonding and hot roll bonding have been successfully combined, for the first time, to produce a new generation of high quality titanium and zirconium clad plate material, and in a far more cost effective manner. This new clad material is greatly superior to the conventional explosive clad material available on the market today, not only in terms of bond quality, but also in the range of area and thickness dimensions in which it can be supplied. This has been made possible by introducing innovative techniques that capitalize on the best attributes of the technologies of explosion bonding and roll bonding and that simultaneously eliminate their limitations.