Terminal (negative and positive) are the two parts connecting between connector and circuit. It can also be welded to make a module or pack in a certain design. These parts should also be well handled to have good current transmitting property. Therefore, fiber laser/hybrid wave welding is the best.
Laser shock peening is a surface engineering process used to impart beneficial residual stresses in materials. The deep and high magnitude compressive residual stress induced by laser peening increases the resistance of materials to surface-related failures, such as fatigue, fretting fatigue, and stress corrosion cracking. Basically, it is a result of laser-material interaction.