1. Solder temperature
2. Preheat temperature
3. Conveyor speed
4. Flux type
5. Flux specific gravity
6. Solder wave depth
7. Conveyor angle
In addition to ‘these controllable factors, several others cannot
be easily controlled during routine manufacturing, although
they could be controlled for purposes of a test. They are:
1. Thickness of the printed circuit board
2. Types of components used on the board
3. Layout of the components on the board