Yep, you can weld steel to stainless and you can weld stainless to steel. You can use steel or stainless welding rod in either case but the steel or steel welding rod will of course rust.
Well, the answer lies in the question; by saying 'real' stainless steel, you are implying that there are fake metals which go under the name 'stainless steel', thus the difference is that the stainless steel in refigerators is actually stainless steel, and the fake stainless steel is not...thus your question is answered...
stainless steel
No, Stainless steel is not porous. Steel how ever is.
Steel and stainless steel tend to weigh around the same, however, stainless steel can sometimes be a bit lighter.
stainless steel
Stainless Steel 316, a type of stainless steel
Stainless steel
a tin plate is tin and a plate, and stainless steel is stainless steel.
UTS of 304L Stainless Steel is 586MPa UTS of 304 Stainless Steel is 621MPa
No, an oven being stainless steel does not make it work better than a non stainless steel version.
Yes, stainless steel can be magnetized to some extent. The level of magnetic properties can vary depending on the specific grade of stainless steel and its composition. Generally, austenitic stainless steels (e.g. 304, 316) are not magnetic, while ferritic and martensitic stainless steels can be magnetized.