Laser Welding

Figure 2a shows a butt weld with the dimensions necessary for the cover to drop into the housing.

The cover and housing dimensions have tolerances that will ensure the lid drops easily into the housing and the gap is kept to a minimum. The lip on which the cover rests has a minimum width of 0.03" and the edge around the lip is typically 0.06".



As shown in figure 2-b below, a filler material is used to weld high reflective metals (aluminum, copper, Also see Plating Considerations below). With a drop in cover, the lid is reduced in size to provide for the filler.  The filler thickness can range from 0.005” – 0.015”.



With a lap weld, the lid tolerance is less important +/- 0.007”.  Fit-up is determined by the flatness of the lid which should be +/- .002 – 0.004”.  Figure 2-d below shows the geometry of this package. 



The laser fillet weld, shown in figures 2-e and 2-f below, is commonly used for hermetic laser weld sealing.  The lid should cover the housing by twice the thickness of the lid and leave at least the same amount of housing exposed from the edge of the lid to the edge of the housing.

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