Greg;
I think you've mentioned your company does ASME Section III (Nuclear) work? I might be confused on this simply knowing you have an excellent working knowledge of ASME so forgive me if I'm mistaken.
In any case, I am working with ASME Section III, Class 1 and am looking into applying 60 x 1.6mm strip cladding in some of our applications. The Code states a heat input limitation of 150KJ/in, which I'm equally sure we'll exceed. Have you run PQR's for strip cladding at your company and, if so, what typical heat inputs have you seen? If you're an ASME Shop, have you noticed these restrictions?
I actually just changed jobs. The company I switched to does do a small amount of nuke work (as well as my previous company), but I don't have a Section III available right now. I haven't seen that any ASME sections if they have a heat input limit, would address the difference between strip and wire as far as heat input. (Kj/in vs kJ/sq While I haven't had a chance to qualify our strip cladding yet, from what I have seen the main differnce between high and low heat input is the thickness that the cladding ends up. If you have to keep a high travel speed to keep the heat input down, you may have to do more layers. But if you double the travel speed, and do 2 layers instead of one, for instance, the weld time is the same, so strip cladding can still pay off.
I actually just changed jobs. The company I switched to does do a small amount of nuke work (as well as my previous company), but I don't have a Section III available right now. I haven't seen that any ASME sections if they have a heat input limit, would address the difference between strip and wire as far as heat input. (kJ/in vs kJ/sq in) When I do complete my strip cladding application, it will be for structural (D1.1/D1.5), so I haven't really had the need to look either. While I haven't had a chance to qualify our strip cladding yet, from what I have seen the main difference between high and low heat input is the thickness that the cladding ends up. If you have to keep a high travel speed to keep the heat input down, you may have to do more layers. But if you double the travel speed, and do 2 layers instead of one, for instance, the weld time is the same, so strip cladding can still pay off.
Thanks Greg, makes sense to me and congratulations(?) on starting a new job.
At the end of the day, I have to deposit 0.375" of cladding, one layer 309L, following layer 308L. This will be deposited onto very thick plate and the finish machined. I'm thinking with the strips we're intending to use; 1/16" thick by 60mm wide we should have no problem getting our required thickness in 2 layers and still keeping a "reasonable" travel speed. Still, ASME III does have this 150Kj/in maximum and I think because of the necessary current we may be close to, if not exceeding that heat input...
Hope your New Year is smooth and prosperous.
I've seen a method used in France that was used for the stainless cladding of reactor heads. It was the first time I had ever seen this, and found it very interesting. In the 70's there were some companies in the US that performed this operation such as combustion engineering. Im no expert, but what I seen worked fantastic. If you need help, I suggest you look up one of those old flatulents on a consultant basis. As for heat input, you can in fact meet those requirements, but from what I've seen, it's a finally tuned operation, your going to be running just under all the way if I gathered my data correctly when I witnessed this process.
P.s> The method used was on Combustion Engineering hardware, If your looking for one of these guys, look in the chattanooga Tn area, or Erie Penn.
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