Replacing chrome-clad brass drain pipe?

Under sink - old chrome-clad brass drain pipe (notice corrosion) goes into what looks like a heavy galvanized steel pipe in the wall.




Above is view of backside of pipe joint (shot via a mirror).


This old house was built in 1955 (single story, slab construction; Denver).

Do you think this joint was originally joined with something like a flange fitting - which broke?
Or, is this how it was done, back in the day (soldered / welded)?

The bright metal "weld" looks like this is solder (scratched it with a screwdriver).

How should I replace this drain pipe (I'm replacing sink; adding a vanity)?

If it is going to be a major task - maybe I should wait till it actually fails?
I was thinking about getting an etching primer and just painting this area to at least cut off oxygen from the outside. Oxygen will feed the corrosion on the inside, but maybe it will corrode a little slower.

thanks

 

Quick question.... in the top picture is that a chrome trim ring that can be removed ?

Ultimately you may be able to use a rubber fernco fitting and cut the chrome off at the heavier pipe.

The plumber will be by later.

 

Thanks for your reply.

"Quick question.... in the top picture is that a chrome trim ring that can be removed ?"

No. What it looks like, from the second photo, is that the galvanized pipe seems to flare out and that the chrome/brass pipe is shoved into it and sealed with solder.
But, that doesn't seem right to me.
That's why I was asking if anyone knew if this was a method used back in the 1950s.

"Ultimately you may be able to use a rubber fernco fitting and cut the chrome off at the heavier pipe."

Doing more research, I see there is something called a rubber "no-hub" pipe coupling. Maybe I could cut back the galvanized pipe - just past the flare - and use such a coupler; maybe downsizing to 1 1/2" drain pipe coming from p-trap.

Here's a youtube that does pretty much what I'm describing:
https://www.youtube.com/watch?v=Wdt4O3uFEtY


"The plumber will be by later. "

What would a plumber do with this?

 

A "no hub" coupling

I meant the pro plumber here at DIY would stop by and offer his opinion in this thread.
I'm not a plumber.... just a plumbing handyman.

 

3 months later - an update.

I did a lot of online reading about what bad news galvanized drain pipes can be.
The drain under my kitchen sink has drained poorly for years.
So, I bit the bullet; opened up the wall under the kitchen sink; managed to remove that nasty "onion-ized" (corroded mess on the inside) old galvanized pipe out of the stack without busting the cast-iron stack.
I replaced it with PVC.

The galvanized pipe under the bathroom sink (the reason for my original post) was a little trickier to get to - but I successfully removed that entire piece of steel from the stack and ran PVC to the bathroom sink.

I had to put a cheater pipe on the end of my pipe-wrench to wrench those 60 yr old steel pipes free from the stack - a calculated gamble.

I got lucky.
Mission accomplished.