First: Yes. Think of dropping off a big shelf, nose first - if you start to tip forward, the stinger is supposed to stop your forward progress. Personally, I don't think that most stingers aren't really big enough to actually accomplish this. Or if they are big enough, they look really weird. I think most are just for the looks. Which is cool.
Not an expert on welding or metal - and there are a few around who will answer.