might be a dumb ??? about Ti and inconel

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is it possible to weld Ti and inconel together or are they too dissimmilar
Reply:Why ?
Reply:i have an inconel header and i need to weld in a bung but i was accidently given a Ti bung. I can't wait for a different one to  come in. i know how to weld both metals but this situation has never come up so i don't know. i do know where to get a stainless one. do you think this would be a better match, given the nickel content  in both?
Reply:If I had to guess I would go with the stainless. I'm curious to see what the more experienced folks say.
Reply:I would highly suggest SS as well, but if that is not an option, then yes you can weld inconel and Ti. I would suggest using inconel 625 welding rod. If it is going to be used for a header then That is why I suggest SS. The Ti would potentially crack after hard use and extreme heat from the exhaust, I am thinking this is for a performance application, where temps are going to be high compared to a standard.
Reply:Originally Posted by ncjerseydevilis it possible to weld Ti and inconel together or are they too dissimmilar
Reply:Rojo- It is possible to weld Ti to inconel, more then likely not with standard procedure. Dissimilar metal welding is becoming more and more possible with advances in technology. But one way of doing it is to use TIG and inconel 625, 625 is very forgiving with a dissimilar metal welding. Here is a reference: http://www.springerlink.com/content/x001qk7476lp672n/Again most of these procedures the normal job shop or hobbyist would not have access to. I would also say if you have never welded Ti then don't do it, it takes a lot to get these two metals to work together.
Reply:That's an interesting link mmchugh, for some time Ti-6Al-4V forgings have been joined to superduplex steel bodies by furnace brazing in the golf industry, I don't have any experience or knowledge of an arc welding process though. Anyone fooling around with laser isn't going to give up any info on the cheap if they do this with satisfaction.I'm reminded of Cat and inertia welding when they were sticking really weird stuff together and hundreds of people were just playing with the process. Probably 99% of what they learned doing this is still proprietary and unseen by outside people.I would expect any current arc process to perform poorly. Every once in a while the shop down the street gets a new guy that "tacks" the aluminum running board to the steel supports underneath for a repair!!! After all, it all looks the same with mud and dirt under there, and the two or so nuts under there don't look very robust.I gotta go with the SS bung too, and ERNiCr-3 filler can be used to join 6xx alloys to 18-8 stainless with TIG, I don't see any need for the Moly addition even if the original header was 625 (we don't know?). It's the weld edge with the stainless that may crack or cold corrode from loss of chrome.If the OP really has inconel headers he's got some serious dough wrapped up in this.PICTURES, PICTURES!Matt
Reply:You may want to check chemical compatibility before using the Ti. I am assuming since you have an inconel header that there are chemicals involved. Ti is a strange metal.For instance, for chlorine at around 20-30ppm of water content, Ti is the best metalurgy. In the presence of dry chlorine, however, the Ti will burn with a very intense heat.If it is not a chlorine line you are probably ok. I do remember using inconel in dry chlorine service.
Reply:Turbo headers ?  Most inconel headers I've seen start around 3 grand. Wish someone would pay me to build some as I've got lots of inconel experience. Good luck and post pics.
Reply:Yes, What kind of header are you refering to?  Whats going in it? Is it solid inconel or is it overlayed?
Reply:they are circle track headers,trying to make them work on a drag car, they .030 thick . but i just went ahead and went with the stainless O2 bung and used inconel 625 to weld it in. i guess we'll what will happen