The present invention relates to a joint structure of steel beams and steel beams, and more particularly, to four cold relates to a structure of a cold-formed steel beam connections Tubular poles produced by welding the molded plate. ; According to a preferred embodiment of the present invention, one end portion is formed by bending inward, and the other end inturned places the four L-shaped rib unit member is formed by bending the bent portion outward in the inturned part and the outer edge of the outwardly bent portion to be in contact with each other, by welding configured to have a closed cross-section and welding the upper and lower diaphragm to the upper and lower surfaces respectively, bending the four L-shaped ribs formed by bending a unit member bends inward on both ends of the upper and lower surfaces of the consolidated part placed on the edge in contact with each other, that is connected to is configured to have a closed cross-section Steel Tubular Column by cold forming and welding characteristics Rectangular Beam steel structure is provided in the steel tube column.
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