The present invention is related to a new type of welding wire based on the encapsulation of reactive powders in sheaths made from different metals. The composition comprises an inner core of solid Calcium and an exterior sheath made of Aluminum or any combination thereof. A steel jacket is also included in the composition to protect it. The amount of steel in the sheath per unit length can vary between 15 - 85%. This ratio allows the reactivity of the calcium and aluminum to be controlled to meet the desired application. This alloying can occur before or following the introduction of the wire into the melt metal bath. The composition of the sheath and the ratio of calcium to aluminum can be controlled by determining the size and gage of the aluminum strip, and the diameter of the calcium wire. The sheath can be made of various materials, but the preferred material is a mild steel.
The cored wire can be used to treat molten alloys. You can use it in conjunction with traditional calcium wires or calcium iron for deoxidation. Desulfurization. Inclusion modification. It has the advantage over conventional cored wires that it requires significantly less pressure in the nozzle to achieve the same effects and can therefore be used with existing feeding equipment already installed at the plant. As a result, capital expenditures and operational costs are lower. Also, expensive lances systems which were needed for traditional cored wiring can be avoided.
It is crucial to ensure that the nozzle does not get blocked and to achieve a good modification of inclusions and optimal addition of calcium when treating molten metals. For conventional cored-wires, high injection speeds are required to accomplish this. This high speed injection can lead to a secondary effect called local oversaturation. It also leads to an excessive amount of calcium in a molten pool. The recovery rate is negatively affected. Hi-Cal is a different case. It only needs a very low speed of injection to get the best level inclusion modification.
Hi-Cal does not agglomerate particles during treatment, unlike conventional cored steel wires. As a result, the molten material treated with cored wires is less effective. Gas entrapment, stress concentration, dispersion weakening, etc. are all negatively affected. Hi-Cal, on the other hand, provides an excellent metallurgical result by controlling particle agglomeration and maintaining a denser distribution of reinforcements in the melt. The metallurgical performances and efficiency of Hi-Cal are superior to those of conventional cored iron wires. Hi-Cal reduces calcium injections by a large amount compared to the conventional calcium-iron steel wires. This results in a reduction of treatment cost.
English
Write a Message