1. Buzzer wave soldering preheating temperature:
A. The "preheating temperature" is generally set at 90-110 degrees, and the "temperature" mentioned here refers to the actual heating temperature of the PCB board welding surface after preheating, rather than the "surface temperature"; If the preheating temperature does not meet the requirements, it is easy to have a lot of residual solder, tin beads, and tin pulling.
B. There are several factors that affect the preheating temperature, such as the thickness of the PCB board, the walking speed, and the length of the preheating zone.
B1. The thickness of the PCB is related to a series of issues such as heat absorption and conduction when the PCB is heated. If the PCB is thin, it is prone to heating and causes the "part surface" of the PCB to heat up quickly. If there are components that are not heat-resistant to impact, the preheating temperature should be appropriately lowered; If the PCB is thick, the "welding surface" will not quickly transmit heat to the "part surface" after being absorbed, and such boards can undergo higher preheating temperatures.
B2. Walking speed: In general, it is recommended to set the walking speed at a speed of 1.1-1.2 meters/minute, but this is not a correct value; If you want to change the walking speed, it is usually necessary to cooperate with changing the preheating temperature; For example, to accelerate the board walking speed, in order to ensure that the preheating temperature of the PCB welding surface can reach the predetermined value, the preheating temperature should be appropriately increased.
B3. Length of preheating zone: The length of the preheating zone affects the preheating temperature. When debugging different wave soldering machines, the impact of this on preheating should be considered; When the preheating zone is long, the temperature can be adjusted closer to the actual temperature of the desired board surface; If the preheating zone is short, the predetermined temperature should be increased accordingly.
