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Metals are all over. Our home equipments at our houses, the furniture in our offices, and the other structures that we see each time we go outside, all those things are entirely or partly made of metal. This just goes to show how big of a part metals play in our lives.
The process of metal working began years and years ago. Even pre-historic men are thought to have practiced this method. Even if it is a bit hard to trace how exactly metal working started, maybe we can all agree that it predates history. Think how life it would be like for the prehistoric men if they did not have metallic equipments to use for their cooking, hunting, and other activities. They were able to make sharp instruments and knives out of pieces of rocks and metals. Since then, the whole thing has progressed into something more sophisticated.
Generally, there're three different types of metal working. They are cutting, joining and forming. Every of these 3 processes even has smaller processes categorized under them.
1. Forming - this is done to deform or modify an object by using pressure, heat, or mechanical force. There are several types of forming processes and many of them are: plastic deforming, casting, & sheet metal forming. Under sheet metal forming, you would get bending, roll forming, spinning, drawing, rolling, stamping, shearing, raising and decambering.
2. Cutting - this is done by removing some part of a material to modify its physical look. The material would normally be cut into two pieces, the waste part and the finished part. Cutting has some 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 assemble minimum 2 work pieces. When the filler metal comes into contact with the work pieces, it would solidify and create a tough and sturdy joint. It is nearly the same as soldering, but the former is done at temperature greater than 450 degrees Celsius. Soldering is done at temperatures less than 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 formed. This would then be left to cool to form a strong joint.
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