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Material science is very important to welding.

The way a metal is heated and cooled determines its properties. When welding is done incorrectly it can result is very weak material around the weld. A very common place to see the effects of welding is around the weld of two pipes. After a period of time, a rust ring can form on either side of the weld (not right next to it, but a small distance away). Although the weld is strong, the surrounding material is weaker.

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