Not exclusively. Police carry many different types, styles and finishes of firearm.
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.
Yes, stainless steel is fine with this process.
440 Stainless. However, a good weapon will never use stainless steel.
Stainless Steel is used because it has an higher corrosion resistance over normal steel.
The most common use for stainless steel bolts is to hold parts together. You may find stainless steel bolts in use on such common household features as plumbing, woodworking and more.
Easy. A rod or electrode used in welding stainless steel. Or to "clad" a surface with stainless steel. (Nothing more than laying down a layer or layers of stainless.) MIG wire also comes in stainless steel. Their are different types of stainless steel and rods/wire/electrodes to use on them.
There is an explanation of passivation and the use of passivation at PF Online Passivation of Stainless Steel. Try the guide to passivation of stainless steel at the British Stainless Steel Association. It discusses the use of nitric acid and citric acid treatments.
You can use the 308 or 316.
since you can use stainless steel surgical knives I think its pretty safe
Just regular steel, not stainless steel. That metal was too hard for use in coins back in 1943.
The stainless steel coffee press originated in Italy. It was designed by Italian designer Attilio Calimani. The stainless steel coffee press is easy to use.
Stainless steel won't tarnish or rust. It is more cost effective now to use a cheaper metal and coat it with stainless steel. Some hardware is brass coated with stainless steel.