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Metal Working: History, Progress, Significance, Processes, Application In Everyday Life
Metals are all over. Our appliances at our houses, the furniture in our offices, and the any other structures that we see every time we go outside, all these things are entirely or partially made of metal. This just goes to show how big of a part metals play in our lives.
The process of metal working started years and years ago. Even pre-historic men are thought to have practiced this technique. Even if it is a little 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 didn't have metal equipments to use for their cooking, hunting, and any other activities. They were able to make sharp equipments and knives out of pieces of rocks and metals. Since then, the entire thing has advanced into something more complicated.
Generally, there're three different types of metal working. They are cutting, joining and forming. Every of these three processes even has smaller processes categorized under them.
1. Forming - it's done to deform or modify an object by using pressure, heat, or mechanical force. There are various 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 substance to change its physical look. The material would usually be cut into 2 pieces, the waste part and the finished part. Cutting has some sub-processes including machining, burning, drilling, threading, turning, grinding, and filing.
3. Joining - examples of joining operations are brazing, soldering and welding. In brazing, you would require to melt a filler metal and turn it into a capillary to set up at least 2 work pieces. Once the filler metal comes into contact with the work pieces, it would harden and create a tough and powerful joint. It's almost the similar as soldering, but the former is done at temperature more than 450 degrees Celsius. Soldering is performed at temperatures below 450 degrees Celsius. In welding, materials are attached by thermoplastics or metals. The work pieces are melted and are then added to the filler substance so some kind of a molten material pool is created. This would then be left to cool to form a strong joint.
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