How to pickle the welded joint between carbon steel flanges and stainless steel cylinders?
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As the title suggests, what pickling process should be chosen for the weld joint between the carbon steel flanged fitting (PL type) and the stainless steel tube section?
It’s the same as how to treat carbon steel painted with stainless steel. Treat them separately
There is no need to pickle this weld; doing so could potentially contaminate the stainless steel.
This welded joint is a dissimilar steel welded joint; if treated separately, how should the welding process be determined?
Welding of dissimilar steels – conduct an evaluation; if it passes, it can be used. There’s no issue with pickling, right?
After welding is completed, the issue lies in the surface treatment of the weld seam; it’s not that there’s a problem with the welded joint, as process evaluations have already been carried out. How do you address the problems related to the post-weld treatment of such joints made of different steel types?
There is indeed this problem. When working with such welded joints, I’ve found that if the pickling time is too long, the carbon steel portion suffers from corrosion. How do you deal with this issue?
If pickling is necessary, use a pickling paste applied locally, making sure not to touch the carbon steel parts.
I agree with the view from the 10th floor: for joints of different steel types, since stainless steel welding materials are used, pickling should be possible.