Hey EdStainless,
Can you let me know the name of manufacturers who are doing automatic butt weld of different SS tubes? We are considering to sub-contract this job out.
Thanks,
Dixie Solar
Hey EdStainless,
Thank you very much for your posting.
The current design is concave top for easy and fast welding process.
Convex design with duplex SS (or other alloys you suggested)at the top seems the solution from all the postings here. The top has to be long enough so the...
600 deg F is only in very rare condition when people drain out the system during summer time, and it usually should be a short period of time. There may be some moisture with minimum Cl in it without any pressure in this condition.
The regular working temp. is 35-210F with pressure about 65...
Thanks for all your valuable posting!
One more question:
What kind of welding structure do you suggest to weld the "safe-end, either duplex SS or incoloy 800" to the top of 304 SS tube? any treatment before welding or any special technique to weld those two different SS materials together...
Attached is the bottom section of the tube after cut. You can see the scattered yellow spots (minor rust I suppose). The yellow spots are not particularly on the weld area or on the longitudinal seam. The bottom and middle section are usually submerged into portable water, not exposed to steam...
It seems that "safe-end" the tube with a short section a Nickel alloy is the solution!!?? because the top of tube is the dead end, it can not be vented.
Maybe weld an incoloy 800 top piece is the cost effective way to do it?
I found "Incoloy 800H/HT alloy was intended for high temperature...
Yes, it is double posted. Because I realized that the corrosion section is a better place for my question.
Incoloy tube is probably too expensive for this application, because 316 already seems expensive....
Please post your suggestions to Corrosion section.
Thanks you all!
The OD of SS tube is 100mm, and the wallthickness is 0.8mm. The SS tube is rolling welded to form tubular first. There may be some cold finish before or during rolling weld process, not sure.
The corrosions were found around the top of circumferential weld area. Attached is a pic of cutting...
Dear All,
I'm developing a solar water heater which combines the collector and storage tank together, heating portable water directly. The product has been made, and tested. The problem we found after 6 months testing is pitting/crevice corrosion on the top of SS 304 tube (welding area).
My...
Dear All,
I'm developing a solar water heater which combines the collector and storage tank together, heating portable water directly. The product has been made, and tested. The problem we found after 6 months testing is pitting/crevice corrosion on the top of SS 304 tube (welding area).
My...
