Metals are all over. Our home equipments at our homes, the furniture in our workplaces, and the other structures that we see every time we go outdoors, all those things are totally or partially made of metal. This just goes to show how large of a part metals play in our everyday life.
The process of metal working began years and years ago. Even pre-historic men are believed to have practiced this technique. Even if it's a bit hard to trace how exactly metal working started, possibly we can all agree that it predates history. Imagine how life it would be like for the ancient men if they did not have metal tools to use for their cooking, hunting, and any other activities. They were able to create sharp tools and knives out of pieces of rocks and metals. Since then, the entire thing has progressed into something more complicated.
Normally, there are three categories of metal working. They are cutting, joining and forming. Every of these 3 processes even has smaller processes categorized under them.
1. Forming - it is done to deform or transform an object by applying pressure, heat, or mechanical force. There're many types of forming processes and some of them are: plastic deforming, casting, & sheet metal forming. Under sheet metal forming, you will find bending, roll forming, spinning, drawing, rolling, stamping, shearing, raising and decambering.
2. Cutting - it's done by removing some part of a material to modify its physical appearance. The material would usually be cut into two pieces, the waste part and the finished part. Cutting has some sub-processes together with machining, burning, drilling, threading, turning, grinding, and filing.
3. Joining - examples of joining processes are brazing, soldering and welding. In brazing, you would require to melt a filler metal and change it into a capillary to assemble minimum two work pieces. Once the filler metal comes into contact with the work pieces, it would solidify and create a hard and sturdy joint. It's nearly the same as soldering, but the previous is done at temperature greater than 450 degrees Celsius. Soldering is performed at temperatures lower than 450 degrees Celsius. In welding, materials are attached by thermoplastics or metals. The work pieces are melted and are therefore added to the filler material so some sort of a molten material pool is formed. This would then be left to cool to form a tough joint.
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