As copper is a fairly inexpensive metal that is widely available, it is commonly used for the creation of jewellery. As the metal oxidizes, however, it is known to turn the skin it touches green. Unfortunately, this oxidization can be difficult to prevent, as everyday we come into contact with a number of substances that bring this about, including the chemicals in soaps and even our sweat.

To prevent your copper jewellery from oxidizing whilst wearing it, at least for a time, you should do the following:

• If you are unsure whether you are allergic to nail polish or not, apply a small amount to your skin and leave to dry. If you don’t notice a reaction of any kind (such as a rash, itchiness or hives) you are free to continue.
• Coat the inside surfaces of your copper jewellery with a layer of clear nail polish. If there are other areas of the jewellery that touch your skin, make sure that you coat these, too.
• Leave the nail polish to dry completely be wearing the copper jewellery. Keep in mind that this protective coating will wear away over time, so you should reapply the nail polish if you notice the green marks reoccurring.

If your copper or other metals(Aluminium, Brass ) jewellery does leave green marks on your skin, there is no need to despair, as these stains can be easily removed. Simply wash the affected area using soap and water; the marks should lift right off. The nail polish method outlined above should be suitable for all types of copper jewellery, including bracelets, necklaces and earrings.

Copper was one of the first metals ever extracted and used by humans, and it has made vital contributions to sustaining and improving society since the dawn of civilization. Copper is a relatively inexpensive and extremely plentiful metal with numerous useful properties. It effectively resists corrosion and is a very effective conductor of both electricity and heat.

• While building construction accounts for more than 40% of all copper use, residential construction is about two-thirds of the building construction market. In the modern times, copper is used for various purposes across diverse industries, but there are four major uses or application areas of copper. These four uses include: Use of Copper in Electrical Industry; Use of Copper in Construction Industry; Use of Copper in Industrial Machinery; and, Use of Copper as an Alloy.
• The common uses of copper in the construction field include using it for welding and soldering; use in brazing applications; use for making lightning rods; and, use in plumbing applications (like making pipes and fittings from copper). The use of copper has also been promoted in the modern concept of green houses and green buildings.
• Presently, copper is used in building construction, power generation and transmission, electronic product manufacturing, and the production of industrial machinery and transportation vehicles. Copper wiring and plumbing are integral to the appliances, heating and cooling systems, and telecommunications links used every day in homes and businesses. Copper is an essential component in the motors, wiring, radiators, connectors, brakes, and bearings used in cars and trucks.
• The average car contains 1.5 kilometers (0.9 mile) of copper wire, and the total amount of copper ranges from 20 kilograms (44 pounds) in small cars to 45 kilograms (99 pounds) in luxury and hybrid vehicles.

Copper occurs in many forms, but the circumstances that control how, when, and where it is deposited are highly variable. As a result, copper occurs in many different minerals. Chalcopyrite is the most abundant and economically significant of the copper minerals. The dramatic rise in need for copper will naturally increase the demand for new mines and processing plants, as current facilities are upgraded and expanded. Therefore copper is one of most important metal used in industries all across the Globe.

There are plenty of ways that metal objects and components can become coated with grease around both the home and the workplace. In the kitchen, grease can come from fried foods (like bacon and even fish), whilst in the workplace it is sometimes needed to lubricate moving parts. If you want to remove greasy coatings from your metal, you should do the following:

Step 1: Using paper towels, wipe away as much of the grease as you can. For overly thick coatings, you can use a plastic scraper in conjunction with the paper towels.

Step 2: Take a soft cloth and apply a little rubbing alcohol to it, then use it to rub at the metal until the grease disappears. For stubborn coatings, you may need to reapply the alcohol and rub for minutes at a time.

Step 3: If you don’t want to use rubbing alcohol, you can put a few drops of a grease-cutting dishwashing liquid on the metal and wipe it away using a soft cloth or a scrubber. Finish by rinsing with clean water.

Step 4: For shiny metals, take a soft cloth that you have sprayed with some household vinegar and wipe it off.

If you cannot completely remove the grease from the metal the first time around, you may need to repeat the method that you have chosen. Keep in mind that, even though there are a number of degreaser products around, they should not be used on aluminium or lacquered metals, as it can be extremely damaging to the surface.

Even the most professional and experienced welders will often comment that aluminium is the hardest metal to work with, simply because there is a number of different chemical properties that must first be understood. Some of these properties include the fact that aluminium doesn’t change colour when it’s heated and that it has a far wider range of melting temperatures than other types of metal. This means that extreme care must be taken to ensure that you are welding the metal correctly.

The melting point of aluminium oxide

One of the first things that you must realize is that aluminium oxide actually has a higher melting point than its base alloys – it won’t start to melt until it reaches 2,050 degrees Celsius. Unless you displace the oxide, you will also be left with a weld that is incomplete. This can lead the connection to crack, break or even to shrivel in size.

The thermal conductivity of aluminium is higher

Another thing that you must understand about welding this metal is that the thermal conductivity is higher because it has to work with a fairly specific amount of heat. This means that aluminium will be more sensitive to the different heat fluctuations that may occur during welding; this could cause the metal to crack or warp.

A higher level of electricity is necessary

When welding aluminium using the arc method, you will need to have a much higher level of heat, because the metal conducts electricity at much higher levels than other metals. This does, however, permit the welder to use a gun that holds longer contact tubes, as the electrode doesn’t get heated the way it does with other methods.

Safety should be your primary concern when welding metal, so you should ensure that you always wear gloves and a helmet. It is also a good idea to wear a long sleeved cotton shirt, as this will protect your skin from being burned by the UV radiation produced.

To ensure that you are able to effectively weld aluminium, you will need a variety of tools, including: a TIG welder (otherwise known as a Tungsten Inert Gas Welder), a pair of strong gloves and a good protective helmet. You will also require a gas to ensure that the weld is perfect. You cannot use argon by itself, but a number of welders say that an argon and helium mix tends to work best with aluminium. Make sure that you have a steel brush on hand to effectively clean the metal as you go.

Every year, tens of thousands of appliances across the world reach the end of their lives and cease working. More often than not, these appliances will eventually find their way to landfill but, by removing the non-metal components, did you know that you can actually recycle them? Use the following instructions for getting rid of all this scrap metal from your home.

Step 1: Move all of the appliances and other scrap items to the area where they will be disassembled. A garage or carport is a great place to do this. Make sure that you have a helper on hand in case some of the scrap is overly heavy.

Step 2: Using your toolbox, begin to disassemble all of the appliances in your collection. Throw all non-metal components into a rubbish bin so that they can be taken to landfill.

Step 3: Load all of the scrap metal into the back of your car or into a trailer to transport to the dealer. If the objects will be open to the air, make sure that you cover them with a tarp to prevent them from falling out.

Whilst it is possible to taken broken down appliances directly to scrap metal dealers and let them remove all of the non-metal components for you, this will actually generate less of a profit. This is why it is best to remove anything that cannot be recycled from the appliance before you load it up. Whilst taking apart your appliances, make sure you wear the proper safety gear.

In part one of this article, we looked at the first four molds that are commonly used in the process of aluminium casting – sand, ceramic, permanent and die casting ones. Now, in part two, we will look at the final three molds and the ways in which they are used to create the various aluminium components that are regularly used across a number of industries.

• Shell: This mold is actually a form of the sand casting one and utilizes resin the bond the sand into a thin shell. This is, however, the more expensive of the two methods, although it is highly effective in producing a better surface on the aluminium component.
• Plaster: These molds are created using a plaster mixture that is poured around some wax or foam. The mold is then baked, allowing the wax or foam to melt away and leaving a perfect copy of its shape. Molten aluminium is then poured into the cavity.
• Graphite Casting: This mold is often used in conjunction with aluminium centrifugal casting. The metal is forced into the mold where it is rapidly chilled. The resulting component cannot be created using any of the other processes.

Each of the seven molds outlined in parts one and two of this blog have long been used to craft the various aluminium shapes and forms that are used in construction and other related industries everyday. By familiarizing yourself with each of the descriptions, you should be able to determine which mold will best suit your needs, resulting in perfectly casted metal every time.

Did you know that all of the aluminium components used in industries across the world have been created through a casting process? The molten metal is poured into molds where it sets and becomes the different shapes and forms that are needed for construction and other industrial applications. But what types of molds are used to cast aluminium and how does each work?

• Sand Casting: This is the oldest type of mold for casting aluminium; it was being used back in the time of the ancient Egyptians. Sand is held in a box and a cavity is created (using a solid material, like timber) whereby the molten metal is poured in. 
• Ceramic: This mold is created around a plastic or wax shape that melts when the mold it fired. Once the wax or plastic has melted away, the mold is ready to receive the molten aluminium. This process is also known as ‘precision casting’. 
• Permanent Casting: These molds are crafted from metals like steel and iron. The aluminium is forced into the cavity, using either gravity or a vacuum. The difference with these molds is that they can be reused again and again. 
• Die Casting: These molds use steel dies to produce a number of castings that are identical. Under high pressure, the molten aluminium is forced into these cavities. It is favoured for being a versatile process, enabling the creation of small to medium castings. 

In part two of this blog, we will take a closer look at some of the other molds that are commonly used in aluminium casting, including shell, plaster and graphite casting ones. These are known for being a little more complex and uncommon than the four outlined above.