... design, there is more difference of temperature between testing postion of control tempreture and heating postion. At ... BGA reworking machine, some products just ignore this point, so that result in lots of problems ... leaded curve is about 200°C,now after melting and recooling, it will reach the idealest strength ... C, maybe 220°C, but still above the melting point-217°C of unleaded solder. Then we can ...