The main beam is the beam that is connected to both ends of the beam In the main frame, the cross beam of the vertical and horizontal cross, why should it be connected at the intersection?Do you need a connection plate for welding? Directly to the steel repair, plug welding can not?
Screw connection for steel structure Riveting, welding can be
Two can be, anyway, there is a connection plate, the intensity can be guaranteed, it depends on the construction requirements and requirements of the demolition.
Welding and high-strength bolt connections can be
