How to control the wave soldering machine height to reduce dross?

In the wave soldering machine soldering stage, the PCB must be immersed in the wave will be coated with solder on the solder joint, so the height of the wave control is a very important parameter. Proper adjustment of wave height so that the wave of solder on the solder joint to increase the pressure and flow rate is conducive to solder wetting the metal surface, into the small hole, wave height standard to control the wave height of the printed board thickness of 2 / 3.

Wave soldering wave height will have some changes due to the welding work time, should be properly corrected during the welding process to ensure the ideal height for welding, to press the depth of tin for the PCB thickness of 1/2 – 1/3 shall prevail, so that the liquid wave solder on the circuit board components to form a certain pressure, can make the components and circuit board pads can be tightly welded together. A closed-loop control can be attached to the wave crest to keep the crest height constant. A sensor is mounted on the conveyor chain guide above the wave crest to measure the height of the wave crest relative to the PCB, and then the tin pump speed is accelerated or reduced to maintain the correct dip height.

The buildup of tin dross is harmful to wave soldering. If dross collects in the solder bath, the possibility of dross entering the wave crest increases. This problem can be avoided by designing the tin pump system so that it draws tin from the bottom of the bath rather than the top where the dross collects. The use of inert gas can also reduce dross and save money.

NeoDen ND250 Wave soldering machine

Wave: Duble Wave

PCB Width: Max 250mm

Tin tank capacity: 200KG

Preheating: Length: 800mm (2 section)

Wave Height: 12mm

PCB Conveyor Height (mm): 750±20mm

Machine size: 1800*1200*1500mm

Transfer speed: 0-1.2m/min

Preheating Zones: Room temperature-180℃

Heating Method: Hot Wind

Cooling Zone: 1

Cooling method: Axial fan cooling

Solder temperature: Room Temperature—300℃

Transfer Direction: Left→Right

Temperature Control: PID+SSR

Machine Control: Mitsubishi PLC+ Touch Screen

Flux tank capacity: Max 5.2L

Spray Method:  Step Motor+ST-6

Power: 3 phase 380V, 50HZ

Air source: 4-7KG/CM2, 12.5L/Min

Weight: 450KG

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Post time: Aug-25-2022

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