Metal Working: Historical Past, Progress, Significance, Processes, Function In Daily Life

Metals are everywhere. Our appliances at our homes, the furniture in our offices, and the any other structures that we see each time we go outdoors, all these 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 started a lots of years ago. Even pre-historic men are believed to have practiced this technique. Even if it is a little bit difficult to trace how exactly metal working started, maybe we can all agree that it predates history. Imagine how life it would be like for the prehistoric men if they didn't have metallic 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 whole thing has advanced into something more sophisticated.

Generally, there're 3 categories of metal working. They are cutting, joining and forming. Every of these three processes even has smaller processes categorized under them.

1. Forming - this is done to deform or modify an object by applying pressure, heat, or mechanical force. There are various kinds 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 - this is done by removing some part of a material to change its physical look. The material would generally 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 need to melt a filler metal and turn it into a capillary to assemble at least 2 work pieces. When the filler metal comes into contact with the work pieces, it would solidify and create a tough and powerful joint. It is almost the same as soldering, but the former is done at temperature more than 450 degrees Celsius. Soldering is done at temperatures lower 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 that some kind of a molten material pool is formed. This would then be left to cool to form a strong joint.

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