Issue link: https://iconnect007.uberflip.com/i/1284035
SEPTEMBER 2020 I SMT007 MAGAZINE 89 with solder bath temperature at 260°C. Sol- der score (S) for each measurement was calcu- lated using the equation, S= [3.5 – T 0 ] + [4 – T 2/3 – T 0 ] + [F max x 10], where F max , T 0 , and T 2/3 stand for maximum force, time to zero wet- ting, and time to reach two-thirds of the maxi- mum force, respectively. T 0 , T 2/3 , and F max val- ues were obtained from the instrument, and solder scores (S) for each run were calculated using that data. A solder score plot (Figure 8) shows that all solvent-activator combinations except 7 have Table 1: Details of solvent activator combinations for wetting balance study. Figure 8: Solder score plot for solvent-activator combinations.