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Hermetic seam sealing or seam welding is a joining process used to create an air- and moisture-tight seal between components. This airtight seal prevents the entry or escape of air and contaminants, protecting sensitive internal components from environmental damage.
Seam sealing or seam welding, is a variation of resistance spot welding. It is most often used to join the lids to the cans of electronic packages. The process utilizes two motor driven electrode wheels which are positioned on opposite sides of the package to be sealed and rolled along the
perimeter conducting current through both components to create the seal.
Hermetic seam sealing is a variation of resistance seam welding in which overlapping welds are created along the mating edges of a package and its lid or cap. The process typically uses rotary wheel electrodes or projection weld heads to apply controlled pressure and electric current through the parts as they are rolled or guided along the seam, forming a continuous, hermetically sealed joint.
Hermetic sealing is most effective when part design and fit-up are controlled to ensure joint conformity and consistent energy delivery, which are critical for achieving a reliable hermetic barrier.
Hermetic seals are essential in applications where even microscopic moisture ingress can degrade performance or reliability. Airtight packages help ensure the long-term stability of sensitive electronic, optical, and microelectronic devices by isolating them from environmental contaminants.
Hermetic sealing is widely used in industries such as:
In parallel seam sealing, two rotating wheel electrodes roll along the perimeter of a package and lid, delivering a series of overlapping welds that form an airtight seam. This technique is commonly used for sealing metal housings and electronic enclosures.
Projection seam welding uses a controlled projection on one part (such as a lid or flange) to focus current and heat at the joint. As current and force are applied, the projection collapses, resulting in a robust hermetic weld at the interface.
Both methods are implemented with precision control of force, current, and motion to ensure a consistent, leak-tight seal around the entire package perimeter.
Hermetic seam sealing often takes place in a controlled atmosphere glovebox to eliminate moisture and other gases that could be trapped inside the package or interfere with the sealing process. Packages may be processed in vacuum bake-out ovens, gloveboxes, or dryboxes that are purged with inert gases such as nitrogen or argon before and during sealing.
Proper atmospheric control ensures a low-moisture environment and reduces the risk of oxidation or contamination inside the sealed package.
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