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Reference.org
Heat fusion
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<p>Heat fusion (sometimes called heat welding, butt welding or simply fusion) is a welding process used to join two different pieces of a <a href="/facts/Thermoplastic/5KJB8dwN">thermoplastic</a>. This process involves heating both pieces simultaneously and pressing them together. The two pieces then cool together and form a permanent bond. When done properly, the two pieces become indistinguishable from each other. Dissimilar plastics can result in improper bonding. </p>