Haha I know you are. I'm so OCD that now if my wife see something on my car that I may not like, she just doesn't tell me.Lol! Sorry! I truly am trying to be helpful.
That's funny. Yeah, I hate washing my car because I always find some new blemish somewhere, every time!Haha I know you are. I'm so OCD that now if my wife see something on my car that I may not like, she just doesn't tell me.
She used to tell me and then i'd obsess over it and i'd always say " I wish you just hadn't told me about it". Well, now she doesn't. lol
Sorry about that! I spent a lot of time inside boilers as a power plant manager in a paper mill. Like I said, my observations are based on pressure vessel and piping repair procedures which are a lot more strict than for someone welding exhaust tubing. If I saw that discoloration on a pressure weld, I'd have the weld ground out and redone. No doubt some fabricators purposely do that because of the colors.Thanks for killing my buzz 😅. But I get the just of what you're saying. Thankfully it doesn't rain or snow much in California and is never subject to road salt so I'm not as concerned about corrosion as I might be in the Midwest or back east. I just know these welds are worlds better than the job that a few of the local muffler shops have done on my previous vehicle exhaust systems.
Pickling stainless steel involves using nitric and hydrofluoric acid to remove a layer of metal down to where there is a homogenous mixture of chromium and iron again. You don't want to mess with those corrosives. I've passivated stainless steel heat exchanger internals with 42 Baume nitric acid (67%) and that stuff is no joke. Hydrofluoric acid is worse. I was in a totally enclosed hazmat suit with an internal air pack while using the nitric acid. For fun, I threw a regular nail in some 67% nitric acid and it dissolved in about a minute, giving off brownish-red nitrogen dioxide which is highly toxic.I was reading up on it a little, apparently the oxidation can be cleaned up post weld with something like pickling paste if corrosion is a concern. Though it sounds like quite the hazardous chemical so I likely won't attempt to do such cleanings anytime soon.