Welded cranked link chain

The utility model discloses a welded cranked link chain, which comprises a plurality of cranked link plates. Pin holes are arranged at the two end parts of the cranked link plates. Adjacent cranked link plates are overlapped at the positions of the pin holes to form chains. Two chains are formed and are arranged in parallel. Sleeves are arranged between the two chains. The two ends of the sleeves are welded with the contact parts of the cranked link plates. The adjacent crank link chains are connected together at overlapped positions through pins which penetrate through the pin holes. The crank link plates are installed on guide rails. The upper ends and the lower ends of the side surfaces of the cranked link plates on the guide rails respectively undergo induction quenching treatment. The external surfaces except welded parts of the sleeves undergo the induction quenching treatment. The welded cranked link chain has the advantages that the structure is simple; and on the premise that the strength of the chai