Metals are all over. Our appliances at our homes, the furniture in our offices, and the any other structures that we see each time we go outside, all those 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 a lots of years ago. Even pre-historic men are thought to have practiced this technique. Even if it's a little bit hard 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 equipments to use for their cooking, hunting, and any other activities. They were able to create sharp instruments and knives out of pieces of rocks and metals. Since then, the entire thing has evolved into something more sophisticated.

Generally, there're 3 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 - it's done to deform or modify an object by applying pressure, heat, or mechanical force. There are various kinds of forming processes and many of them are: plastic deforming, casting, & sheet metal forming. Under sheet metal forming, you will 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 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 operations are brazing, soldering and welding. In brazing, you would require 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 harden and create a hard and powerful joint. It's almost the same as soldering, but the former is done at temperature more than 450 degrees Celsius. Soldering is done at temperatures below 450 degrees Celsius. In welding, materials are attached by thermoplastics or metals. The work pieces are melted and are therefore added to the filler substance so 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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