LASER WELDING
Plastic welding:
The principle involved in laser plastic welding is seam welding.
In this process, the laser beam penetrates the piece to be joined which is positioned on top and is absorbed by the piece which is positioned on the bottom.
The heat results in plasticization, which extends through the gap in the workpiece. As heat is conducted,
the piece which is positioned on top is heated. It follows that the smallest possible gap in the workpiece
is a determining factor for success, since it acts as a heat barrier.
Working principle of laser absorption welding:
The laser light penetrates the upper layers and is absorbed by the lower piece to be joined (A). As the lower piece heats up (B), heat is conducted to the upper piece (C).
The shared melted band solidifies under pressure applied externally to create a high quality welded connection (D).
What can be welded?
Success in laser plastic welding depends on various factors.
One is the choice of material. Normally plastics of the same composition are joined to each other.
Different plastics can be joined, provided they are chemically and physically compatible and their
melting temperature ranges overlap sufficiently.
Using the correct laser source is another important factor.
Finally, successful welding also depends on the design of the part and processing machine, which must exert sufficient pressure on the materials to be joined.
A trial set-up is the fastest way to resolve any questions.
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To the solution from ACSYS - BARRACUDA plastic laser welding
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