Steel mills provide the first rod for the chain. Before being stored by the chain-making departments, the rod will be cleaned and drawn into a precise wire diameter. Small sets of machinery, or cells, incorporating formers, welders, calibrators, and occasionally twisters are used to create chains. The former takes the wire and cuts it to roughly the length needed for a chain link before stamping the grade and trace code on it. This component is wire-formed into a link that joins with the first link already produced, forming a chain. The welder forges the links together after receiving the chain where each link terminates. This procedure also assesses the chain’s tensile strength, paying particular attention to the welded portion.
In order to evaluate the weld’s integrity and physical qualities, samples of the welded chain are taken from the production run many times per shift. The results of each test are recorded electronically for future use. For usage in cross chains that make contact with the road in tire chains, some chains are twisted. The chain is examined before being deposited into a storage box to await the subsequent procedure. The grade of the chain and any Uɴɪqᴜᴇ customer needs to influence the procedure. A portion of the chain will be sent to our induction heat treaters for quenching and tempering, where it will be heated to between 1600 and 1700 degrees F, quenched in water, and then tempered at 400 to 600 degrees.
The chain will then be automatically proof-tested to twice its working load limit. For assembly into a variety of products, principally tow, binder chains, and agricultural safety chains, these chains will be placed in drums or cut to length. Please be aware that only alloy chains should be used for overhead lifting and that no chain should ever be loaded beyond its rated operating load limit. Heat treating is not necessary for other chain classes, such as a proof coil or high test. No, a package, shot blasting, hot-dip galvanizing, zinc plating or other specialty coatings would come after form and weld. The finished welded chain is packaged and prepared for shipping, however, it will probably only be cut and put together into a variety of assembled items. The chain is then delivered to the customer, who can use or sell it there.
Let’s see the Incredible manufacturing process from scrap steel to rebar then giant chain and nail nipper in the ᴀᴡᴇsome video below.
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