Influence of remote-laser-welding parameters for an 8 kW fibre laser on the seam quality of steels

Oefele, Florian; Musiol, Jan; Zaeh, Michael F.

doi:10.2351/1.5061339

Cited by 5 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Different nozzle concepts are described in current research. A flat jet nozzle was examined in [10,12] to draw conclusions about the quality of shielding gas coverage based on oxygen content. Mixing with the surrounding atmosphere was found, especially in the sidewise shear layers [12] due to the high velocity difference between the shielding gas and the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

“…A flat jet nozzle was examined in [10,12] to draw conclusions about the quality of shielding gas coverage based on oxygen content. Mixing with the surrounding atmosphere was found, especially in the sidewise shear layers [12] due to the high velocity difference between the shielding gas and the atmosphere. With increased distance from the orifice, the lateral influence of the shear layer increased, and at the same time there was a rapid increase in the oxygen content [12].…”

Section: Introductionmentioning

confidence: 99%

“…Mixing with the surrounding atmosphere was found, especially in the sidewise shear layers [12] due to the high velocity difference between the shielding gas and the atmosphere. With increased distance from the orifice, the lateral influence of the shear layer increased, and at the same time there was a rapid increase in the oxygen content [12]. The authors of [13] compared different nozzles regarding flow conditions (i.a., slit die, Laval nozzle, flat jet nozzle, open tube) to describe the quality of shielding gas coverage by means of laminar length.…”

Section: Introductionmentioning

confidence: 99%

“…The flow stall is relevant due to the backflow regions enabling mass transport from atmosphere to the processing zone. A mixing of shielding gas and atmosphere occurs in the shear layer in addition [10,12]. A parabolic velocity profile can reduce a mixing due to minimized velocity gradients between resting atmosphere and shielding gas [20,24].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Local Shielding Gas Supply in Remote Laser Beam Welding

Schricker

Baumann

Bergmann

2021

JMMP

View full text Add to dashboard Cite

The use of shielding gases in laser beam welding is of particular interest for materials interacting with ambient oxygen, e.g., copper, titanium or high-alloy steels. These materials are often processed by remote laser beam welding where short welds (e.g., up to 40 mm seam length) are commonly used. Such setups prevent gas nozzles from being carried along on the optics due to the scanner application and a small area needs to be served locally with inert gas. The article provides systematic investigations into the interaction of laser beam processes and parameters of inert gas supply based on a modular flat jet nozzle. Based on the characterization of the developed nozzle by means of high-speed Schlieren imaging and constant temperature anemometry, investigations with heat conduction welding and deep penetration welding were performed. Bead-on-plate welds were carried out on stainless steel AISI 304 for this purpose using a disc laser and a remote welding system. Argon was used as shielding gas. The interaction between Reynolds number, geometrical parameters and welding/flow direction was considered. The findings were proved by transferring the results to a complex weld seam geometry (C-shape).

show abstract

Section: Introductionmentioning

confidence: 99%