TY  - JOUR
AU  - Chung, Woo-Sik
AU  - Hummel, M.
AU  - Spurk, C.
AU  - Häusler, A.
AU  - Olowinsky, A.
AU  - Häfner, C.
AU  - Beckmann, Felix
AU  - Moosmann, Julian
TI  - In situ X-ray phase contrast imaging of the melt and vapor capillary behavior during the welding regime transition on aluminum with limited material thickness
JO  - Welding in the world
VL  - 68
IS  - 1
SN  - 0043-2288
CY  - Heidelberg
PB  - Springer
M1  - PUBDB-2024-00217
SP  - 43-50
PY  - 2023
AB  - The X-ray phase contrast imaging is a powerful method to understand the fundamental behavior of the melt and keyhole during the laser beam welding process. In this paper, the keyhole-induced vapor capillary formation in the melt pool is investigated by using an adjustable laser beam source. For this purpose, the aluminum A1050 specimen with a thickness of 0.5 mm is molten only with the heat conduction welding regime by using the ring-mode laser beam. Once the specimen is molten through, the core multi-mode laser beam is then applied to vaporize the melt and a transition to keyhole welding regime occurs. Therefore, the core multi-mode laser beam with an intensity value of 33.3 MW/cm2 is investigated. The correlation between the keyhole-induced vapor capillary and the melt behavior is further investigated in this paper which was recorded with a high sampling rate of 19 kHz. In addition, a theoretical calculation about the keyhole depth is discussed in this paper. 
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001096596700001
DO  - DOI:10.1007/s40194-023-01616-1
UR  - https://bib-pubdb1.desy.de/record/601487
ER  -