Hello, this is not really car related, or maybe it is, but lets discuss it anyway....
i heard somewhere that if your weld turns gray it will probablly rust is this right? im kinda concerned because i'll be making a ss fence for a friend of mine and i don't want it to start rusting in a few day/months/years, so help me out here

heres something else i was making today, lets not focus on the welds they are not really pretty but they will hold and thats the main thing, but lest discuss colors on these two pices. in my opinion left one probablly wouldn't rust, but what about the right one?

and P.S: excuse my english it's not really my native language





thank you in advance for your information

 

Both welds will hold, but the sugared one on the right didn't see adequate gas coverage while welding.

 

yup they will, but would the right one rust? both had the same gas flow, but i did two passes on right one while the piece was still hot,

 

What filler did you use?

 

if you get stainless too hot while welding and it grays it will lose it's anti corrosive properties to some degree

 

Its called carbide precipitation, anytime you weld too hot or mis-use stainless (like say, using 304 for turbo headers) you'll eventually lose all of the chromium to it bonding with carbon in the steel.

Even if you cheat and use a higher nickel(312) or higher chromium(309) rod, you still get carbide precipitation in the HAZ and are back to square one.

 

321 is just too damn expensive

 

on filler rod it says ER 308 LS1 / KW T.4 316 so i guess its 316?
i don't know what the pipe was it was a piece i had in garage for a while... to short to have any markings on it, and washer was just a standard ss washer, there were A and 4 stamped on one side