Metal Working: History, Development, Significance, Processes, Function In Everyday Life
Metals are everywhere. Our home equipments at our houses, the furniture in our workplaces, and the other structures that we see every time we go outside, all of those things are totally or partly made of metal. This just goes to show how large of a part metals play in our daily life.
The process of metal working began years and years ago. Even pre-historic men are thought to have practiced this method. Even if it's a bit difficult to trace how exactly metal working started, possibly we can all agree that it predates history. Think how life it would be like for the ancient men if they did not have metal equipments to use for their cooking, hunting, and other activities. They were able to create sharp tools and knives out of pieces of rocks and metals. Since then, the whole thing has progressed into something more advanced.
Normally, there are three different types of metal working. They are cutting, joining and forming. Each of these 3 processes even has smaller processes categorized under them.
1. Forming - this is done to deform or transform an object by using pressure, heat, or mechanical force. There're several types of forming processes and many of them are: plastic deforming, casting, and sheet metal forming. Under sheet metal forming, you will find bending, roll forming, spinning, drawing, rolling, stamping, shearing, raising and decambering.
2. Cutting - it is done by removing some part of a substance to modify its physical appearance. The material would usually be cut into 2 pieces, the waste part and the finished part. Cutting has several sub-processes with machining, burning, drilling, threading, turning, grinding, and filing.
3. Joining - examples of joining processes are brazing, soldering and welding. In brazing, you would need to melt a filler metal and change it into a capillary to set up minimum two work pieces. Once the filler metal comes into contact with the work pieces, it would harden and make a hard and sturdy joint. It is nearly the similar as soldering, but the previous is done at temperature greater than 450 degrees Celsius. Soldering is performed at temperatures below 450 degrees Celsius. In welding, materials are joined by thermoplastics or metals. The work pieces are melted and are therefore added to the filler material so that some sort of a molten material pool is created. This would then be left to cool to form a tough joint.
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