The ease of laser welding two miniature titanium machined parts is shown here.
A neodymium magnet is placed inside the housing, which consists of two titanium parts. The assembly is set to rotate so that the laser weld spots centre onto the joint between the two parts. Titanium undergoes the laser welding process in a particularly effective manner.
Laser welding of similar alloys containing titanium tends to lead to good strong welds, whilst welding dissimilar alloys requires investigation and the possible use of fillers to ensure good welds. Similarly, nickel, stainless steel and other materials can be subject to good strong laser welds.
Like electron beam welding (EBW), laser welding has high power density, of the order of 1 megawatt/cm²(MW), resulting in small heat-affected zones and high heating and cooling rates. The spot size of the laser can be varied between 0.2 mm and 2.0 mm. The depth of penetration is proportional to the amount of power supplied, but is also dependent on the location of the focal point: penetration is maximized when the focal point is slightly below the surface of the workpiece.