I bet they are just as stong. And there nothing wrong with welding on the wheels. If everything is done right there is no worries. It looks like darn good work to me.
2002 ZX6R, Shark Skinz, custom paint, Ignition advance plate, Shift kit, Yoshimura TRS Full race with Duplex header, K&N, 14/40 gear and sprocket, Ivans jet kit and Dyno tune for 103hp at the wheel. 110hp with 110 octane!