Stainless Welding And Rust ???

admin

I thought I read somewhere that welding stainless causes it to lose its rust resistant qualities..........so why does stainless lose its rust resistant qualities once it is welded???
Reply:No improperly welding stainless makes it loose it's rust resistance.There are quite a number of ways this can happen. One is using tools used for plain steel on stainless. You can imbed tiny particles of mild steel in the stainless material causing rust. Using the wrong shielding gas, or not having the weld protected long enough or well enough from atmospheric contamination is another. So would using the wrong filler material..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:Short answer- Properly welding stainless doesn't cause it to lose its corrosion resistance.DSW beat me to it by one minute.Airco Ac/Dc 300 HeliwelderMillerMatic 200 (stolen)Miller Maxstar 150STLMiller AEAD200LE (welding and generating power) Hobart MIG
Reply:Would using too much heat also cause rusting ???
Reply:Everytime you heat and cool stainless steel, it starts to lose its mineral content and starts more resembling steel. Stainless has a life cycle up to a certain temp. depending upon its metalurgy. The short answer, if welded properly a stainless weld should not rust. Now if you ask is it possible for stainless to eventually rust, yes.
Reply:using a carbon steel brush on stainless would cause rust.
Reply:Originally Posted by rahtreelimbsWould using too much heat also cause rusting ???
Reply:As DSW and others have stated there are many reasons for stainless rusting.  But if everything is done correctly with respect to tools used, cleaning and no mistakes being made at the foundry ........... it can still rust if the welding isn't done correctly. .  The reason for this is sensitization For example, (and assuming everything is fine with the tooling used, cleaning, and with base metal and filler material) 304 and 316 stainless will rust in the weld/HAZ when welded and then subjected to the enviroment.   If you don't want this to happen you'd need to get the low carbon version of these stainless alloys (304L or 316L) and then weld them up with the appropriate low carbon stainless electrodes/wire as well as use the correct tooling and cleaning processes.For a pretty good explanation of the reasons why stainless rusts and a brief disscusion of sensitization, click on the link below:http://nhml.com/rusting-by-stainless-steels.cfm
Reply:Here is some info:http://en.wikipedia.org/wiki/Intergranular_corrosion"USMCPOP" First-born son: KIA  Iraq 1/26/05Syncrowave 250 w/ Coolmate 3Dialarc 250, Idealarc 250SP-175 +Firepower TIG 160S (gave the TA 161 STL to the son)Lincwelder AC180C (1952)Victor & Smith O/A torchesMiller spot welder
Reply:My company has welded stainless products come in for "stainless passivation," to help combat rust.Lincoln Power Mig 216Lincoln AC/DC-225/125Miller  625 X-Treme PlasmaMiller 211 Forney 95FI-A 301HF 91110Victor Journeyman O/PMilwaukee DaytonMakita  Baileigh NRA Life Member