Lernkarten

Karten 14 Karten
Lernende 2 Lernende
Sprache English
Stufe Universität
Erstellt / Aktualisiert 16.01.2015 / 16.05.2016
Lizenzierung Keine Angabe
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0 Exakte Antworten 7 Text Antworten 7 Multiple Choice Antworten
Fenster schliessen

Wich two types of laser welding exist?

  1. Deep-penetration laser-welding
  2. Heat-conduction laser-welding
Fenster schliessen

Explain how deep-penetration-welding works.

• Vaporization-temperature of the workpiece is exceeded due to high laserpower and good focussing (small df), which leads to high intensity.

• Metal-vapour streams vertically up, the resulting recoil (Rückstoß) onto the liquid melt-pool-surface causes the creation of a deep and narrow vapourchannel (D„ ampfkapillare)“, often called a „keyhole)“.

• Through the keyhole (D„ ampfkapillare)“ the laser-beam enters the workpiece into deep depths and such warms it up „from the inner“(and not only „from the surface)“.
 

Fenster schliessen

Explain the "multi-reflections-effect" during deep-penetration-welding.

Wich ammount of energy can be absorbed using a high sophisticated process?

During the multiple reflections of the laser-beam inside the keyhole (Dampfkapillare) every time a ray (Teilstrahl) touches the keyhole-walls, an amount of it´s energy is absorbed there.


Touching the keyhole-walls sufficiently frequent, the total amount of absorption in practice can reach high numbers of up to > 90%.
 

Fenster schliessen

How does a typical setup of a laser welduing optic look like?

Lizenzierung: Keine Angabe

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Fenster schliessen

Wich laser suits for the follwowing application(s)?

Delicate (filigran) components, with only low allowed thermal stresses (wenig wärmebelastbar), e.g. microtechnology
 

(1) pulsed YAGlasers; (2) cwYAG-lasers (with low PL); (3) Diode lasers

YAG with LLK

Pulsed YAGlaser, preferably without LLKs (fibre-cables)

CO2-laser

Fenster schliessen

Wich laser suits for the follwowing application(s)?

Thin walled (dünnwandig) components ( < ca. 0,4 mm )
 

Pulsed YAGlaser, preferably without LLKs (fibre-cables)

YAG with LLK

YAG-lasers, with or without LLK

(1) pulsed YAGlasers; (2) cwYAG-lasers (with low PL); (3) Diode lasers

CO2-laser

Fenster schliessen

Wich laser suits for the follwowing application(s)?

3D-Welding-Paths

YAG with LLK

Pulsed YAGlaser, preferably without LLKs (fibre-cables)

CO2-laser

YAG-lasers, with or without LLK

(1) pulsed YAGlasers; (2) cwYAG-lasers (with low PL); (3) Diode lasers

Fenster schliessen

Wich laser suits for the follwowing application(s)?

Non ferrous (NE-) metals with high reflectivity (e.g. Al, Cu)
 

(1) pulsed YAGlasers; (2) cwYAG-lasers (with low PL); (3) Diode lasers

YAG-lasers, with or without LLK

CO2-laser

Pulsed YAGlaser, preferably without LLKs (fibre-cables)

YAG with LLK