Hardware based Analysis and Process Control for Laser Brazing Applications

Ungers, Michael; Rolser, Raphael; Abels, Peter

doi:10.1016/j.phpro.2013.03.111

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…An example of the resulting process images is given in Figure 15; brazing wire, melt pool as well as the solidified seam are visualized. The image quality is more than sufficient to run computer vision algorithms that measures machine parameters like brazing velocity as proposed by [26] that can be used for controlling purposes. In addition, the process observation gives the opportunity to evaluate the product quality during manufacturing in terms of on-line pore detection [27].…”

Section: A -mentioning

confidence: 99%

Brightness and average power as driver for advancements in diode lasers and their applications

Hengesbach

Poprawe

Hoffmann

et al. 2015

High-Power Diode Laser Technology and Applications XIII

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Spatial and spectral emission characteristics and efficiency of high-power diode laser (HPDL) based pump sources enable and define the performance of the fundamental solid state laser concepts like disk, fiber and slab lasers. HPDL are also established as a versatile tool for direct materials processing substituting other laser types like CO2 lasers and lamp pumped solid state lasers and are starting to substitute even some of the diode pumped solid state lasers. Both, pumping and direct applications will benefit from the further improvement of the brightness and control of the output spectrum of HPDL. While edge emitting diodes are already established, a new generation of vertical emitting diode lasers (VCSELs) made significant progress and provides easy scalable output power in the kW range. Beneficial properties are simplified beam shaping, flexible control of the temporal and spatial emission, compact design and low current operation. Other characteristics like efficiency and brightness of VCSELs are still lagging behind the edge emitter performance. Examples of direct applications like surface treatment, soldering, welding, additive manufacturing, cutting and their requirements on the HPDL performance are presented. Furthermore, an overview on process requirements and available as well as perspective performance of laser sources is derived

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Section: A -mentioning

confidence: 99%

Brightness and average power as driver for advancements in diode lasers and their applications

Hengesbach

Poprawe

Hoffmann

et al. 2015

High-Power Diode Laser Technology and Applications XIII

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“…The effects of brazing temperature and holding time on the joint shear strength were also investigated by them. Ungers et al [22] proposed a procedure to estimate machine parameters during the process and control the quality of the process for laser brazing application. Li et al [23] compared microstructure and mechanical properties of Mg/mild steel and Mg/stainless steel joints that were laser welded-brazed with Mg--based filler metal.…”

Section: Introductionmentioning

confidence: 99%

Comparative study on laser brazing of austenitic and martensitic stainless steels with silver-based filler metal

Khorram¹,

GHOREISHI²,

J.³

et al. 2016

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In the present study, laser brazing of austenitic stainless steel (type 321) and martensitic stainless steel (type 410) have been performed using 400 W pulsed Nd:YAG laser with silverbased filler metal. The microstructure was investigated using Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDS). The laser brazed joints consist of α-Ag solid solution, α-Cu solid solution surrounded by the α-Ag solid solution and eutectic structure. Filler metal shows better spreading on 321 stainless steel because of more content of Ni and presence of Ti as an activator in the alloy. The average thickness of reaction layer is approximately 3.2 µm for 321 stainless steel and 2.2 µm for 410 stainless steel. The tensile strength of 321 stainless steel joints is higher than that of 410 stainless steel joints due to higher thickness of reaction layer, more spreading and smaller wetting angle. The average of micro hardness for joints in a seam is approximately 146 HV. K e y w o r d s : plaser brazing, 321 stainless steel, 410 stainless steel, silver-based filler metal,

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“…For a given manufacturing task, the given parameter set has to translate constantly to the targeted process variables what is either done by robust system design or by executing control. It is not sufficient to ensure constant laser power, it is important to ensure a constant amount of energy being absorbed per unit length [7]. Therefore, the motion of the laser beam relative to the work piece needs to be known which cannot be determined easily in the case of remote welding due to the long kinematic chain.…”

Section: Introductionmentioning

confidence: 99%

Cognition for robot scanner based remote welding

Thombansen

Ungers

2014

SPIE Proceedings

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The effort for reduced cycle times in manufacturing has supported the development of remote welding systems which use a combination of scanners for beam delivery and robots for scanner positioning. Herein, close coupling of both motions requires a precise command of the robot trajectory and the scanner positioning to end up with a combined beam delivery. Especially the path precision of the robot plays a vital role in this kinematic chain. In this paper, a sensor system is being presented which allows tracking the motion of the laser beam against the work piece. It is based on a camera system which is coaxially connected to the scanner thus observing the relative motion of the laser beam relative to the work piece. The acquired images are processed with computer vision algorithms from the field of motion detection. The suitability of the algorithms is being demonstrated with a motion tracking tool which visualizes the homogeneity of the tracking result. The reported solution adds cognitive capabilities to manufacturing systems for robot scanner based materials processing. It allows evaluation of the relative motion between work piece and the laser beam. Moreover, the system can be used to adapt system programming during set-up of a manufacturing task or to evaluate the functionality of a manufacturing system during production. The presented sensor system will assist in optimizing manufacturing processes

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Hardware based Analysis and Process Control for Laser Brazing Applications

Cited by 8 publications

References 6 publications

Brightness and average power as driver for advancements in diode lasers and their applications

Brightness and average power as driver for advancements in diode lasers and their applications

Comparative study on laser brazing of austenitic and martensitic stainless steels with silver-based filler metal

Cognition for robot scanner based remote welding

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