1.Stress connection: When the precision spot welding joint is welded at room temperature, the pure solder is plastic self-annealing alloy, It can absorb stress under the condition of work hardening or fatigue damage due to stress cycling. The unique function of this precision spot welding head for soldering enables it to connect materials with different coefficients of thermal expansion, rigidity and strength without putting forward some typical technical requirements for mechanical assembly parts. For example, the planning of printed circuit boards violates all structural planning guidelines concerning stress concentration, material strength, load distribution, and vibration resistance. If there is no soft solder connection method and its stress connection ability, it is impossible to have printed circuit boards as known today. If other stress yield welding methods are used, such as brazing or other welding methods, they may cause damage to the laminate, The line strip is dropped and the glass- metal seal of the on-board components is damaged. 2.Reliability: Since soft soldering can be welded at a lower temperature, plastics and welded components are usually not deformed and functionally deteriorated due to heat. 3.Economical: Because the equipment used for soft soldering of precision spot welding head is simple, the material is cheap and the soldering process is controllable, so the soldering method is particularly economical. In the near future, as long as we use wires, semiconductor equipment and insulating materials to make circuits based on the principles of electric and magnetic pulses, the soft soldering of precision spot welding heads is an indispensable technical means.