As circuit boards are placed on a pallet ready to go through wave soldering, time and temperature are closely associated with soldering performance. As far as time and temperature are concerned, a professional wave soldering machine is necessary, while the PCB assembler's expertise and experience are seldom easy to obtain since they depend on application of up-to-date technologies and business focus.
If temperature is set too low, flux won't be melted properly, reducing the ability to react and dissolve oxide and dirt on the surface of the metal. In addition, the alloy won't be generated by flux and metal if the temperature is not sufficiently high. Other factors such as speed of the band carrier, wave contact time, etc. should be taken into consideration.
Generally speaking, even though the same wave soldering equipment is used, different assemblers offer differing manufacturing efficiency due to operation methods and the extent of knowledge about how to operate the machine.