Metal Working: History, Development, Importance, Techniques, Application In Daily Life
by Chris on February 15, 2010
Metals are everywhere. Our appliances at our homes, the furniture in our workplaces, and the other structures that we see every time we go outside, all those things are totally or partly made of metal. This just goes to show how big of a part metals play in our everyday life.
The process of metal working began years and years ago. Even pre-historic men are supposed to have practiced this technique. Even if it's a 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 ancient men if they did not have metal equipments 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 whole thing has evolved into something more sophisticated.
Usually, there are 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 applying pressure, heat, or mechanical force. There're several types of forming processes and many 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 - this is done by removing some part of a material to modify its physical appearance. The material would normally be cut into 2 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 turn it into a capillary to assemble minimum two work pieces. Once the filler metal comes into contact with the work pieces, it would harden and create a hard and sturdy joint. It is almost the same as soldering, but the previous 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 therefore added to the filler material so that some kind of a molten material pool is formed. This would then be left to cool to form a sturdy joint.
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