The increasing complexity of microelectronics/ engineering devices and the requirement for higher yields and automated production systems place stringent demands on the assembly techniques and performance requirements of materials and joining techniques. This increased interest in the use of lasers for microwelding applications across a range of applications. The term micro-welding also known as precision welding, refers to welding the parts that have a weld bead size <1mm and a weld penetration depth <1mm. Besides the size of the weld seam and the depth of penetration of the weld, other laser microjoining requirements are:
Laser microwelding is used for joining high value miniature components in a range of industries i.e., Electronics, Telecommunications, Automotive & Medical Industry (Table 1). Compared to conventional microwelding methods i.e., resistance, flash, arc, TIG, and MIG, plasma laser micro-welding offers several advantages i.e.
Table 1: Examples of microwelding applications
|Automotive||Air bag assemblies, fuel injectors, lighting assemblies, batteries, Ignition controls|
|Medical||Hearing aids, prosthetics, pacemaker and defibrillator implants, implantable radioactive capsules, cochlear implants, surgical tools, ultrasound catheters, orthodontic appliances|
|Electronics||Leadframe assemblies, electrical connectors, relay terminal connections, mobile phone batteries, flexural arms for hard disc drives, mobile phones, stator spacers, fuel and solar cells|
|Other micro-products||Jewellery, razor blades, sensing devices, thermocouples, micro- pumps, ink-jet cartridges, micro-turbines, micro-motors, micro-gears, watch part components|
Everfoton offers several low-power SM CW and Quasi-CW optical fiber lasers for micro-welding applications and some examples of micro-welding are highlighted in (Figure 1).