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Fundamentals<br />
The term joining refers to welding, brazing, soldering <strong>and</strong><br />
adhesive bonding. In these process a permanent joint between the<br />
parts is formed <strong>and</strong> cannot be separated easily.<br />
The term assembly usually refers to mechanical methods of<br />
fastening the parts together. Some of these methods allow easy<br />
disassembly, while others do not.<br />
<strong>Welding</strong> is a material joining process in which two or more parts<br />
are coalesced (joined together) at their contacting surfaces by a<br />
suitable application of heat <strong>and</strong>/or pressure. Sometimes parts are are<br />
united together by application of pressure only without external external<br />
heat.<br />
In some welding process a filler material is added to facilitate<br />
coalescence.<br />
<strong>Welding</strong> is most commonly associated with metallic parts but for<br />
plastics also it is used.
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