How to grasp the temperature using a rework station?

How to grasp the temperature using a rework station?

Use bga rework station how to set the proper temperature? It must have a lot of friends just spend

rework station very much like to know, right? Actually very simple.

We should all know the melting point of lead solder is 183 degrees, and 217 degrees is lead-free. That is

the time when it reaches 183 degrees, have lead solder paste will begin to melt, but also the actual melting

point solder beads higher than paste.

BGA rework station made in the use of time, Take now the mainstream type of hot air rework station for it,

because relying on the principle of air convection, the temperature is still very uniform, welding time,

because there BGA body block, the actual spread tin temperature hot bead portion than at the outlet

should be about 30-40 degrees, that is, do leaded BGA, we go no matter how divided temperature ranges,

the highest temperature of about 220 degrees first set you can start heating up, then The key is, when the

temperature rose to 200, we should start from the side view of the degree of melting of solder balls

(you can also tweezers touch BGA, solder completely melts, BGA is sliding), had a meeting to melt tin

Under collapse, this time depends on the temperature meter on the machine or the touch screen display

and take time, in the melting temperature so that time was extended for a further 10-20 seconds,

the temperature is ideal!

For example: If doing a lead of Northbridge, we see that the tin is 225 degrees away in 15 seconds at

the beginning of the open, then just take the temperature profile of the last paragraph of the thermostat

is set to 225 degrees 35 seconds can be. Lead-free is the way to do the same.

As time how the thermostat setting, you can refer to the temperature curve parameters provided by the

manufacturer. Generally control the entire process around the early lead solder 210 seconds, unleaded

control in about 280 seconds. The time not too long, too long for both PCB and BGA there may be damage!