Techniques used for Laser Welding

Techniques used for Laser Welding

1- Contour Welding

In contour welding, a laser is guided along a predetermined welding pattern. The material only melts on the path that the laser is directed. Relative motion is achieved by moving the laser source, the part or a combination of both.

2-Simultaneous Welding

In this technique, a laser will heat the entire weld area simultaneously. Almost any beam geometry can be generated by means of a special, state-of-the-art beam shaping elements. Parts, up to an area that equals 2.000" diameter, can be welded using this method.

3-Radial Welding

A unique welding method for bonding cylindrical components where by a mirror deflects the laser beam such that it impinges radially on the outside symmetrical surface of the component. The designed tight fit between the parts that are to be joined ensures the clamping pressure required fo r laser welding to be successful is incorporated.

3-Patented Hybrid Welding

Hybrid welding combines laser energy with infrared thermal radiation from conventional halogen lamps. This increases the welding speed weather the weld path is in two or three ­ dimensions. The main application for this technology is structural components in the automotive sector, such as: automotive lighting and motor assemblies.

4-Patented Laser Hot Riveting

Laser hot riveting combines riveting technology with laser plastic welding. A positively locked joint between two components is created using this method. The riveting tool does not come into contact with the plasticized material. This provides a clean process. Laser hot riveting can be used to join components which cannot be welded directly – for instance, fixing PCBs to plastic housings.

5-Mask Welding

With this patented technique, a mask is inserted between the laser source and parts to be welded. A curtain laser beam is moved across the entire joining area of the parts. The laser beam welds only where the components are not covered by the mask. The mask welding method makes it possible to weld extremely delicate weld areas.

Typical Applications: medical micro-fluidic devices and electronic components.

6-Globe Welding

Globe welding works along the lines of Contour welding. A laser beam is focused at a point on the joining plane via an air bearing, frictionless, free rotating glass sphere. The glass sphere not only focuses the laser beam; it also serves as the mechanical clamping tool. While the sphere rolls on the components, it applies continuous pressure at a point on the joining plane. The glass sphere replaces the mechanical clamping device and expands the scope of laser welding for both continuous and three-dimensional applications.

Typical Applications: automotive taillights, apparel  

                                                                                            Muhammad Umair Akram
                                                                                            Third Year
                                                                                            Director M&MR (SME-NED)