Airliners rarely use welds because they're very hard to make with consistent high quality and are also very hard to inspect. Instead, they're riveted together.
There are airplanes constructed with chemical bonding as well, such as the Boeing 787 Dreamliner and my personal favorite, the AA-1, released in 1967! Welded airplanes are practically nonexistent, but there are techniques other than riveting. And with the rise in popularity of composite materials, we're likely to see fewer and fewer rivets on airplanes.
