smt pick and place machine,high speed pick and place machine,magnetic linear motor,smt mounting,smt production line

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Industry related knowledge

Reflow soldering

Background to technology generation:

Because of the need of continuous miniaturization of electronic products PCB boards, flake components appear, and traditional welding methods can no longer meet the needs. At first, only the reflow welding process was used in the assembly of mixed integrated circuit boards. Most of the components were sheet capacitance, sheet inductance, mount transistor and diode. With the development of SMT whole technology and the emergence of various patch components (SMC) and mount devices (SMD), the reflow welding technology and equipment as part of mount technology have been developed accordingly.

Factors affecting the welding process:

During the SMT reflow welding process, the main reasons for the uneven heating of components are: the difference of heat capacity or heat absorption of reflow welding elements, the influence of conveyor belt or heater edge, and the load of reflow welding products.

1. PLCC,QFP usually have a larger heat capacity than a discrete piece, it is more difficult to weld large-area components than small ones.

2. the conveyor belt in the reflow welding furnace makes the transfer product reflow welding at the same time, it also becomes a heat dissipation system. in addition, the edge of the heating part is different from the central heat dissipation condition, the edge temperature is generally low, and the temperature of the same carrier surface is also different in the furnace except for the different temperature requirements of each temperature zone.

3. the impact of different product loading. The temperature curve of reflow welding should be adjusted with good repeatability under no load, load and different load factors. the load factor is defined as: LF=L/(LLF=L/S); where LLLF=L/S the length of the assembled substrate, SLLF=L/S the interval between the assembled substrates.

The larger the load factor, the more difficult the reflow welding process is. Generally, the range of the maximum load factor of the reflow welding furnace is 0.5~0.9. This depends on the product situation (component welding density, different substrate) and different models of reflow furnace. To get good welding effect and repeatability, practical experience is important.