Shouldn't break like that unless it's a cheapass, flea-market knock-off. In which case, the handle is probably pot-metal(mostly zinc with some other random scrap tossed in). If this is so, it cannot be welded. You can epoxy it carefully, but it's probably just easier to buy another. Or save up for something that isn't junk.
What's the model? If it's a decent production piece(which I'm honestly doubting), and it broke under normal use, you could contact the company that made it to, at the very least, report a flaw.