Welding of rolled steel
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To buy various brands and profiles of rolled steel of domestic production is offered by Electrovek-Steel company. Effective prices are from manufacturers. The supplier guarantees the timely delivery of the products to any address indicated by the customer.
Features of the properties of roll steels
Particularly in the group of high-carbon low-alloy tool steels, such steels are characterized by unsatisfactory weldability. Especially, it is impossible to weld volumetric rolled metal, which sometimes allows sheet and flat blanks from the materials in question.
Taking into account the peculiarities of «normal» wear of rolling rolls with uniform abrasion of their contact surfaces, welding rather than welding of rolling rolls is much more often performed. The essence of the process lies in the fact that a layer of molten metal of the same chemical composition is applied to the working surface of a worn or crushed roll, the height of which ensures (taking into account the allowance for subsequent processing) the restoration of the roll size to the originally required ones.
Varieties of the surfacing process:
- Electric arc (can be made in manual, semi-automatic or automatic modes);
- High-frequency currents;
Electrovek-steel company offers various brands of roll steels at affordable prices. The supplier guarantees prompt delivery of products to the address specified by the customer.
Technological modes of surfacing
The metal deposited on the working surfaces of the rolls must have a high impact strength, wear resistance (including shearing stresses), and for hot rolling rolls, also heat resistance.
Before surfacing, the surfaces of the rollers are thoroughly cleaned of impurities, as well as traces of grease and oxides. To accelerate the burnout of oil from the surface of the roll, preliminary annealing can be used.
Immediately before the start of the process, all cracks, grooves and grooves are sealed, for which inserts made of graphite or copper are used. All non-melting surfaces are covered with asbestos. After that, the rolls are heated to temperatures of 350… 400 0 С. Surfacing is conducted layer by layer, using electrodes of the EN-60M type, or UONI-13/85, after which they are compressed in dies on hydraulic presses to achieve a fine-grained structure of the metal. When arc-surfacing is used a short arc of reverse polarity.
Immediately after surfacing, rolling rolls from roll steels undergo tempering to relieve internal stresses. The recovery of these products can be multiple.
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