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what is a soldering iron
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 SOLDER IRON

 A soldering iron is a hand tool most commonly used in soldering. It supplies heat to melt the solder so that it can flow into the joint between two workpieces.

                                        

A soldering iron is composed of a heated metal tip and an insulated handle. Heating is often achieved electrically, by passing an electric current (supplied through an electrical cord or battery cables) through the resistive material of a heating element. Another heating method includes combustion of a suitable gas, which can either be delivered through a tank mounted on the iron (flameless), or through an external flame.

Less common uses include pyrography (burning designs into wood) and plastic welding.

Soldering irons are most often used for installation, repairs, and limited production work. High-volume production lines use other soldering methods.