By analyzing surface acoustic wave filters that failed due to spatter residue, it was confirmed that the residue was generated during the parallel welding process. The influence of key welding parameters on parallel welding was studied. By adjusting welding power, welding time, welding speed, and other parameters, the weld width and overlap area were optimized to fall within the ideal range, reducing the probability of spatter residue to 2 in 10 000 while maintaining welding quality. Additionally, an electroplated nickel plate with a higher melting point was selected to replace the electroless nickel plate, further reducing spatter residue generation during the parallel welding process.