The hot assembly of couplings is often used in the installation of heavy equipment such as large motors, compressors and steel rolling mills, because the couplings and shafts in such equipment are usually connected together by interference fit. The assembly methods of interference fit parts include several types such as press-in assembly, low-temperature cold assembly and hot sleeve assembly. At the installation site, the hot sleeve assembly method is mainly adopted because this assembly method is relatively simple and can be used for large-diameter (D >1000mm) and large interference fit machine parts. The press-in assembly method is mostly used for light and medium static fits and requires mechanical equipment such as presses, so it is generally only adopted in manufacturing plants. The cold shrinkage assembly method generally uses liquid nitrogen and other materials as the cold source and requires a certain insulated container, so it can only be adopted when conditions permit.

Generally, hot-dip heating of couplings is only used for smaller-sized couplings (with an inner diameter of less than 100mm). The method is simple and the heating is uniform. When the oxygen-acetylene flame heating method is used to heat small machine parts or local parts of larger machine parts, the method is simple, but it requires relatively skilled techniques to prevent overheating and damage to the machine parts. For large couplings, multiple oxygen-acetylene flame heating and blowtorch heating can also be used in combination, and the effect is very good. Although electric heating is a relatively good heating method, its application at installation sites is limited due to the need for dedicated equipment. However, electric induction heating can still be considered for selection. The electric induction heating method adopted for large and medium-sized couplings at the installation site involves passing a working frequency (50Hz), low voltage and high current through the induction coil.