Welder possibly used 308 filler on 16Ga sheet metal 316 part

[apropos]

Are there any detectable visual differences between the two filler rods after the part has been welded?

 

[Mr168]

No, there will not be any visual difference.

 

[unclesyd]

What type environment will the part be exposed to?

The reason is that the general corrosion resistance of 316 SS is better than 304 SS. If you put a sample of each outside in certain atmospheres the 304 SS will show staining and spotty rust long before 316 SS.

 

[apropos]

unclesyd,
It is a guard panel on a pharmaceutical labling machine. Not structural, only ambient temperatures.

 

[unclesyd]

There are no problems other than aesthetics in your case.

It should be ok since they normally don't use harsh cleaners on this part of the line and they wou;d keep it wiped down.

Cleaners with Chlorine will tend to rust 304 SS a lot quicker that 316 SS. Normally used SS cleaners will not cause any problems.