One way is to use the Split tool to create multiple bodies and then Shell them to create the hollow tubes. Finally activate the Weldment tool.
But the best way (IMO) is to start the weldment from scratch. Draw the centrelines of the frame in a 2D sketch and then start the Weldment tool to create the frame.
Check out the Help files and Tutorials therein for more details.
The attached Weldment uses a 1.5" x .094" tube. You will have to create your own profile for the 1/8" wall.
thank you kelvin i just need practice practice practice!