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Wire Drawing and Hot-dip Galvanizing

Time:7/12/2012 Clicks:

* Wire Drawing
It is a metal working process which uses tensile forces to stretch metal. It is broken up into two types: sheet metal drawing and wire drawing. The specific definition for sheet metal drawing is that it involves plastic deformation over a curved axis. For iron wire, especially galvanized iron wire, the starting stock is drawn through a die to reduce its diameter and increase its length.


Drawing is usually done at room temperature, thus classified a cold working process, however it may be performed at elevated temperatures to hot work large wires, rods or hollow sections in order to reduce forces. It is upon the same principle: the starting stock drawn through a die to reduce the diameter and increase the length.


Usually the die is mounted on a draw bench. The end of the workpiece is reduced or pointed to get the end through the die. The end is then placed in grips and the rest of the workpiece is pulled through the die. Steels, copper alloys, and zinc aluminum alloy wire are common materials that are drawn. Drawing can also be used to produce a cold formed shaped cross-section. Cold drawn cross-sections are more precise and have a better surface finish than hot extruded parts. Inexpensive materials can be used instead of expensive alloys for strength requirements, due to work hardening.


* Hot-dip Galvanizing
Hot-dip galvanizing is a form of galvanization. It is the process of coating iron, steel, or aluminum with a thin zinc layer, by passing the metal through a molten bath of zinc at a temperature of around 860 °F (460 °C). When exposed to the atmosphere, the pure zinc (Zn) reacts with oxygen (O2) to form zinc oxide (ZnO), which further reacts with carbon dioxide (CO2) to form zinc carbonate (ZnCO3), a usually dull grey, fairly strong material that stops further corrosion in many circumstances, protecting the steel below from the elements.


The process of hot-dip galvanizing results in a metallurgical bond between zinc and steel with a series of distinct iron-zinc alloys. Galvanized iron wire is suitable for high-temperature applications of up to 392°F (200°C). The use of at temperatures above this will result in peeling of the zinc at the intermetallic layer. Electro galvanized wire is often used in automotive manufacturing to enhance the corrosion performance of exterior body panels, this is however a completely different process.


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