Lasers power up for glass welding
A
Laser Lines (Industrial and Medical) product story
Edited by the Engineeringtalk editorial team
Aug 26, 2008
Welding glass (or metal) is an ideal CO2 laser application because the laser provides an excellent pin-point heat source capable of generating millions of watts per square centimetre.
Pyrex is a tough, durable, low-expansion borosilicate glass widely used in the manufacture of pipettes, flasks, and other Pyrex glassware found in laboratories throughout the world.
This unique application calls for sealing Pyrex glass pipettes by welding one end.
Welding glass (or metal) is an ideal CO2 laser application because the laser provides an excellent pin-point heat source capable of generating millions of watts per square centimetre depending on laser output power and focused spot size.
The glass welding setup consists of a rotary stage suspended beneath a gas jet manifold affixed to the laser faceplate.
The manifold holds a 63.5mm positive-meniscus focusing lens that provides a 100um spot with a 1.8mm depth of field.
A gas jet fitting below the optic provides a connection for the assist gas, which in this case is 0.07bar of clean, dry air.
Each pipette has an outside diameter of 2.1mm with a wall thickness of 0.25mm and is spun at 330rev/min by the rotary stage.
After firing 50W watts of power at the end of the pipette for approximately 10 revolutions (1.8s), perfectly welded spherical ends were achieved on the Pyrex pipettes.
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