Aluminum is one of the most used metals in today’s society – Aluminium Window Frames For Sale in Pretoria it can be found across a number of industries, such as construction and commercial, and in a number of applications, such as beverage cans and appliances. When choosing a manufacturer of aluminium extrusion for supplying the metal that you use in your workplace, however, it is important that you carefully consider which one will be best for your needs.
The manufacturer will begin by removing the aluminium from deep within the earth’s crust (either as bauxite ore or feldspar). Often, the Bayer’s method, Wohler’s method or Hall Heroult method is chosen to remove the metal in its molten form. It is then hardened and moulded into whatever shape the manufacturer desires. When the aluminium is extracted from the earth in its solid form, Aluminum Framing System it will be passed through a number of mechanical processes that are designed to give the metal its desired shape. These processes include: rolling, drawing, forging, spinning, piercing and extrusion.
Regardless of whether aluminium has been found in its molten or solid form, the manufacturer will then pass it through either a hot working or cold working process to prepare it for their customers. When using the hot working process (the most popular of the two), a billet will be heated to a temperature of over 79 degrees Celsius, which will allow the aluminium to be easily distorted and placed into its desired shape.
The reason for the popularity of the hot working process over the cold working one can be fully realized when you compare aluminium extrusion to squeezing toothpaste out of its tube. It is much easier to extrude the metal when it is malleable, meaning that it must have been heated to a certain temperature.
Finally, the aluminium will pass through an extrusion and drawing process that runs almost parallel to each other. This is the final step in the whole extrusion process and is the step that gives the metal its entire shape. Deep drawing, for example, is used give the metal a cup, conical tapered, cylinder and seamless tube shape. For less curved shapes, Aluminium Structural Framing the drawing process is skipped.
Once you are satisfied with the processes and methods utilized by a potential manufacturer of aluminium extrusions, you can begin submitting your orders with them. If, after your first delivery, you are still satisfied with the manufacturer based on the promptness of the order being filled and the quality of the aluminium that you receive, you can continue the relationship.
Aluminium Window Frames For Sale in Pretoria?
High strength aluminium alloys.
The origin of aluminium alloys in aircraft construction started with the first practical all-metal aircraft in 1915 made by Junkers in Germany, of materials said to be `iron and steel'. Steel presented the advantages of a high modulus of elasticity, high proof stress and high tensile strength. Unfortunately these were accompanied by a high specific gravity, almost three times that of the aluminium alloys and about ten times that of plywood. Aircraft designers during the 1930s were therefore forced to use steel in its thinnest forms. To ensure stability against buckling of the thin plate, intricate shapes for spar sections were devised.
In 1909 Alfred Wilm, in Germany, accidentally discovered that an aluminium alloy containing 3.5 per cent copper, 0.5 per cent magnesium and silicon and iron, as unintended impurities, spontaneously hardened after quenching from about 480°C. The patent rights of this material were acquired by Durener Metallwerke who marketed the alloy under the name Duralumin. For half a century this alloy has been used in the wrought heat-treated, naturally aged condition. The improvements in these properties produced by artificial ageing at a raised temperature of, for example, 175°C, were not exploited in the aircraft industry until about 1934.
In addition to the development of duralumin (first used as a main structural material by Junkers in 1917) three other causes contributed to the replacement of steel by aluminium alloys. These were a better understanding of the process of heat treatment, the introduction of extrusions in a wide range of sections and the use of pure aluminium cladding to provide greater resistance to corrosion. By 1938, three groups of aluminium alloys dominated the field of aircraft construction and, in fact, they retain their importance to the present day. The groups are separated by virtue of their chemical composition, to which they owe their capacity for strengthening under heat treatment.
The first group is contained under the general name duralumin having a typical composition of: 4 per cent copper, 0.5 per cent magnesium, 0.5 per cent manganese, 0.3 per cent silicon, 0.2 per cent iron, with the remainder aluminium. The naturally aged version was covered by Air Ministry Specification DTD 18 issued in 1924, while artificially aged duralumin came under Specification DTD 111 in 1929. DTD 111 provided for slight reductions in 0.1 per cent proof stress and tensile strength.
The second group of aluminium alloys differs from duralumin chiefly by the introduction of 1 to 2 per cent of nickel, a high content of magnesium and possible variations in the amounts of copper, silicon and iron. `Y' alloy, the oldest member of the group, has a typical composition of. 4 per cent copper, 2 per cent nickel, 1.5 cent magnesium, the remainder being aluminium and was covered by Specification DTD 58A issued in 1927. Its most important property was its retention of strength at high temperatures, which meant that it was a particularly suitable material for aero engine pistons. Its use in airframe construction has been of a limited nature only. Research by Rolls-Royce and development by High Duty Alloys Ltd produced the `RR' series of alloys. Based on Y alloy, the RR alloys had some of the nickel replaced by iron and the copper reduced. One of the earliest of these alloys, RR56 had approximately half of the 2 per cent nickel replaced by iron, the copper content reduced from 4 to 2 per cent, and was used for forgings and extrusions in aero engines and airframes.
The third and latest group depends upon the inclusion of zinc and magnesium and their high strength. Covered by Specification DTD 363 issued in 1937, these alloys had a nominal composition: 2.5 per cent copper, 5 per cent zinc, 3 per cent magnesium and up to 1 per cent nickel. In modern versions of this alloy nickel has been eliminated and provision made for the addition of chromium and further amounts of manganese.
Aircraft structural aluminium.
Of the three basic structural materials, namely wood, steel and aluminium alloy, only wood is no longer of significance except in laminates for non-structural bulkheads, floorings and furnishings. Most modern aircraft still rely on modified forms of the high strength aerospace aluminium alloys which were introduced during the early part of the 20th century. Steels are used where high strength, high stiffness and wear resistance are required. Other materials, such as titanium and fibre-reinforced composites first used about 1950, are finding expanding uses in airframe construction.
Aluminum Frames Vs PVC Or Wood - Are They Worth the Extra Cost?
When you are refurbishing or extending your house or building a new one you will face the question of which door material to use. Aluminum doors or steel doors? The most commonly used door materials are the aluminium, wood, PVC, steel, but which is better? Let's show the facts and situations to use either aluminium doors or steel doors.
One of the most important characteristics of a door is the durability. The durability greatly depends on the environment where the door is implemented, the conditions of use or the area where it is installed.
This is one of the biggest obstacles for using doors. Although we can use some stainless steel that combines iron, chromium, and many other elements. It can be a little expensive if we want great corrosion resistance and thus, durability. Stainless steel can get marked up with fingerprints and grease, develop discolouration, scratches and eventually rust. In coastal areas, the corrosion issues get worse decreasing the useful life of the steel door, so the maintenance with protective layers of paint is periodically needed.
On the other hand, the aluminium doors are the perfect choice for outsides since it has a natural resistance to corrosion that makes it maintenance free. For example, the aluminium doors are even lighter than their steel counterparts at a very similar price, and the flexibility of the material offers much more profile styles than doors. So let's say aluminium doors are mostly recommended for the steel doors for the outsides unless you need the structural strength of the steel for hard use or safety reasons.
In this situation, the steel doors are preferred since they are cheaper, safer and more resistant than aluminium since it cannot be kicked and is extremely hard to bend, even using tools. The aluminium counterpart can be more expensive, but it can give a premium feel to the door when the correct door style is used. Additionally, the aluminium doors offer a great variety of finishes and colours that result in a nice look in the right circumstances. The steel doors can be stylish too since they do an excellent job of imitating the wood with the use of some advanced state-of-art door.
Home intruders are one of the major concerns for every family guy. The best option for security issues are the steel doors since the steel is one of the strongest material to manufacture a door. The steel door won't crack or warp, and there are some high-security steel door models that feature a large number of locks and hinges with different style designs. There is also some high-security doors that use aluminium as a main metal component, so the aluminium doors are not left behind on this subject.
Both door presentations are not solid steel or aluminium. They have foam, wood, polyurethane or polystyrene foam or fiberglass core to prevent the heat transfer. So, in this case, both doors have a great thermal insulation that will help you to keep your house warm in the winter and cool in the summer, making them energy efficient.
As mentioned before, the aluminium offers a choice of colours to match the style of your home. Meanwhile, when we want to avoid the rust on the steel, the galvanized steel is recommended. Nonetheless, this kind of steel is not easy to customize or paint. If you want a customized steel door that endures at lifetime, you have to pay for the premium stainless steel, which is not cheap at all. An alternative to premium stainless steel but not as good-looking is a coat of weather-resistant paint since the steel can accept a large variety of paint types but they must be weather-resistant to prevent corrosion and be falling apart because of the rust expansion in the steel door.
The cost of the steel and aluminium doors depends greatly on the security level, style, and corrosion resistance. The steel doors can be really inexpensive when the corrosion resistance is not required, and its maintenance is easy to do. But if you need corrosion resistance, galvanized steel could be a cheap but not an aesthetic option. The expensive premium steel offers the bests doors in terms of aesthetics, security and endurance options.
In the case of the aluminium doors, they are cheaper than premium steel doors, but they offer improved natural corrosion resistance for a longer useful life. Nonetheless, the aluminium doors are not made for hard use which can hinder its useful life and result in an extra cost by replacing the door after a rigorous use as is in a patio with kids and pets.
Both doors have enormous potential in different areas, but if you do not care about saving money, I think the winners are the doors thanks to its great versatility and variety of presentation for almost any budget and environment. The steel doors are a reliable option for security, durability, and aesthetics.
The aluminium doors are quite good as well, they offer a maintenance free material with excellent durability for a reasonable price. However, it lacks structural strength in comparison to the steel doors. You have the ultimate decision to choose the best door that can fit your style, secure and budget requirements.