27/Dec
2007

Some Advantages of Laser Welding

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Plastics are laser-welded by passing laser light through a (laser transparent) top part onto a (laser absorbent) bottom part. The absorbed laser energy softens and melts both parts. With externally applied clamping pressure, the parts are bonded upon cooling. Typically, diode lasers having a wavelength in the (infra-red) range of 800nm-1000nm are used in this process.

20070119_s6000007_laser_welding_pei, originally uploaded by UST Harmoni.

Advantages of laser welding:

* Joint design need only be surface to surface. There is no need for energy directors or collapse of the weld joint.
* Weld lines can be as narrow as 0.1mm (0.004 in.)
* Good welds can be achieved, even to a hermetic seal. Tensile strength is that of the unreinforced base resin
* There is no relative motion between the parts as happens with vibration welding. There are no vibrations that could damage electronic components
* Three-dimensional geometries can be welded
* There is no part marking or bleed through
* The joint has less flash than with other methods

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The four main laser welding methods:

* Spot laser welding
* Line laser welding
* Mask laser welding
* Simultaneous through welding

In spot welding, a circular spot of laser energy traverses a pre-programmed contour path. The simultaneous line method creates a laser line for welding, while the mask method blocks the laser line in a predefined pattern. Simultaneous through welding delivers laser energy to the entire surface via a fiber optic head and typically runs a three to five second cycle.

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Some Advantages of Laser Welding

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