Metal Working: Historical Past, Improvement, Significance, Techniques, Application In Everyday Life
By Erina Array
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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 every time we go outdoors, all these things are entirely or partially made of metal. This just goes to show how large of a part metals play in our lives.
The process of metal working began years and years ago. Even pre-historic men are supposed to have practiced this technique. Even if it is a little bit hard to trace how exactly metal working started, perhaps we can all agree that it predates history. Think how life it would be like for the prehistoric men if they did not have metal tools to use for their cooking, hunting, and any other activities. They were able to make sharp instruments and knives out of pieces of rocks and metals. Since then, the entire thing has developed into something more complicated.
Generally, there are three categories 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 transform an object by using pressure, heat, or mechanical force. There are several types of forming processes and some 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 - it's done by removing some part of a substance to change its physical appearance. The material would usually be cut into two pieces, the waste part and the finished part. Cutting has a few 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 change it into a capillary to set up at least two work pieces. Once the filler metal comes into contact with the work pieces, it would solidify and create a tough and powerful joint. It's nearly the similar as soldering, but the former is done at temperature greater than 450 degrees Celsius. Soldering is performed at temperatures less than 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 sort of a molten material pool is created. This would then be left to cool to form a strong joint.
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