As you know, LTW is different from such welding method such as hot plate, vibration and ultrasonic welding. There are a large variety of features of thermal welding that have never been seen. For example, LTW has the advantage of good surface finish and no flash.
Also, the thin wall of the plastic parts can be welded because the radius of the beam can be optically controlled and there is little heat stress in the parts.
| LASER TRANSMISSION WELDING (LTW) | |
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Principle |
First, the "Laser
Transmission Material" (which can transmit the laser beam) is overlapped
on the "Laser Absorption Material" (which can absorb the laser beam). Next, the laser light radiates the two pieces of material on the condition of the suitable pressure. Then, the laser light is transmitted thru the "Laser Transmission Material" and is heated (melted) on the surface of the "Laser Absorption Material". The heat is melted to the "Laser Transmission Material" by means of the thermal conductivity and the melting pool is formed between the "Laser Transmission Material" and the "Laser Absorption Material". Finally, the "Laser Transmission Material" and the "Laser Absorption Material" are joined. |
|
Advantage |
Good surface appearance
(non-contact welding) Localized heating (The thin wall of the plastic parts can be welded because the radius of the beam can be optically controlled and there is little heat stress in the parts.) Reliability (Welding strength, Hermetic property, and precise energy control). No vibration (E.g.: No adverse impact on the precision junction parts). Quietness (E.g.: No noise generated by comparison of the ultrasonic sound). Workability (No flash and no dust) |
|
Disadvantage |
Productivity (Welding
speed) Two types of materials (transmission/absorption) are needed. |
|
Application |
Electric Key, Head Lamp, Tank, Plug, Injector, The other precision junction parts. |