2. Light steel joists can be divided into suspended ceiling joists and partition joists according to their uses, and V-shaped, C-shaped, T-shaped, L-shaped and U-shaped joists according to their cross-sectional forms. The thickness of the main keel and the secondary keel of the T-shaped keel is 0.27mm. The load-bearing keel should be no less than 1.0mm, the covering keel should be no less than 0.5mm, the T-shaped keel should be no less than 0.27mm, and the wall keel should be no less than 0.6mm. The thin keel is prone to unqualified mechanical properties. Although some keels have qualified mechanical properties, they are easy to deform.
3. Light steel keel is widely used in hotels, docks, stations, office buildings, interior decoration settings and other places. The welding method of light steel keel is to fuse the covered electrode with the welding part by the heat generated by electric arc, and form a strong glue similar to metal after cooling; The connection mode of bolts is to connect the parts together through bolts, which is convenient and quick to install; The way of rivet connection is to use a rivet gun to drive a rivet with a circular prefabricated positioning pin at one end into the nail hole to achieve the fixing effect.