Dynamic Approach Of The Keyhole And Melt Pool Behavior For Deep Penetration Nd-Yag Laser Welding

2008 ◽  
Author(s):  
Rémy Fabbro ◽  
El-Hachemi Amara ◽  
Saïd Boudjemai ◽  
Djamila Doumaz
Keyword(s):  
Laser Welding ◽  
Deep Penetration ◽  
Dynamic Approach ◽  
Yag Laser ◽  
Melt Pool

Metallic vapor ejection effect on melt pool dynamics in deep penetration laser welding

2004 ◽  
Vol 16 (1) ◽  
pp. 16-19 ◽  
Author(s):  
Rémy Fabbro ◽  
Mohammed Hamadou ◽  
Frederic Coste
Keyword(s):  
Laser Welding ◽  
Deep Penetration ◽  
Melt Pool ◽  
Metallic Vapor

scholarly journals An Experimental Approach for the Direct Measurement of Temperatures in the Vicinity of the Keyhole Front Wall during Deep-Penetration Laser Welding

2020 ◽  
Vol 10 (11) ◽  
pp. 3951
Author(s):  
Ronald Pordzik ◽  
Peer Woizeschke
Keyword(s):  
Laser Welding ◽  
Boiling Point ◽  
High Speed ◽  
Pure Aluminum ◽  
Welding Process ◽  
Deep Penetration ◽  
Front Wall ◽  
Melt Pool ◽  
Direct Laser ◽  
Welding Processes

The formation of defects such as pores during deep-penetration laser welding processes is governed by the melt pool dynamics and the stability of the vapor capillary, also referred to as the keyhole. In order to gain an insight into the dynamics of the keyhole, the temperature in the transition region from the liquid to the gaseous phase, i.e., near the keyhole wall, is a physical value of fundamental importance. In this paper, a novel method is presented for directly measuring temperatures in the close vicinity of the keyhole front wall during deep-penetration laser welding. The weld samples consist of pure aluminum with a boiling point of 2743 K. The measurement is performed using high-speed pyrometry with a refractory tantalum probe capable of detecting temperatures that significantly exceed the boiling point of the sample material. Temperature curves are recorded from the beginning of the welding process until the moment the probe is finally destroyed through direct laser-tantalum interaction. With an effective spatial resolution up to 0.3 µm in the welding direction, a detailed investigation into the temperature ranging from the prerunning melt pool front to the keyhole center is possible, exhibiting temperatures of up to 3300 K in the vicinity of the keyhole front wall.

A stochastic model of the deep penetration laser welding of metals

1997 ◽  
Author(s):  
Phiroze Kapadia ◽  
Pablo Solana ◽  
John Dowden
Keyword(s):  
Stochastic Model ◽  
Laser Welding ◽  
Deep Penetration
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