Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

High Speed Laser Soldering for Flexible Interconnection of Self-Bonding Copper Wires

29.10.2009
For manufacturing processes with small and medium quantities in the sectors of electrical, medical and sensor engineering, the Fraunhofer Institute for Laser Technology ILT has established an automated laser soldering process that significantly increases the flexibility as well as the process speed of production. In view of the progressing miniaturization of building groups, this process has great potential.

Manufacturing highly integrated, electro-engineering components in Europe primarily demands, in addition to high quality, a high amount of flexibility to remain competitive against the cost advantages found in low-wage countries. Manufacturing facilities have to be transferable to a wide variety of products, preferably without retooling.


Demonstrator component to solder self-bonding wires on circuit boards. Source: Fraunhofer ILT

In addition, quick, highly automated manufacturing procedures are necessary for largely unmanned manufacturing. Exposed to these requirements are small and medium-sized enterprises who occupy market segments for highly integrated electrical engineering components in small and medium quantities; such segments cannot be served by mass production facilities. Examples are innovative products from medical or sensor technology for which a significant production step is the interconnection of enamel-insulated coil wires to connection pads on a circuit board.

Currently, the interconnection is soldered manually for these products due to a lack of automation facilities. Since the process and the geometry of the component are complicated, the manufacturing process can only be reproduced with difficulty. The quality of the solder connection, thus, strongly depends upon the person conducting it. So that the insulating enamel layer is removed from the wire, the hot soldering iron has to be guided over the individual wire several times with a certain contact pressure - this way the insulating enamel melts and the bare wire surface contacts the liquid solder immediately. This method is not only time consuming, but also harbors a danger: the section of wire to be connected can tear when very thin self-bonding wires, e.g.
To increase the process speed and reproducibility, the Fraunhofer ILT has developed an automated laser soldering process that not only enhances the manufacturing flexibility, but also offers great potential for further miniaturization. With this process, the enamel removal and the interconnection take place in one single process step. On the one hand, the reproducibility is significantly increased via integrated process monitoring and control based on pyrometric sensors used in the laser-beam soldering process. On the other, the contactless laser soldering process offers significant potential for miniaturization in comparison to competing processes, since the dimensions of the connecting pads can be reduced down to several hundred micrometers.

This automated soldering process allows not only a nearly free choice of connection geometries, but also makes manufacturing so flexible that any number of quantities - even individual parts - can be produced without increasing reaction time, as a particular product requires. Medium-sized companies in the sector of electronic manufacturing can clearly fall back on the expertise of the Fraunhofer ILT.

Contact Partners at Fraunhofer ILT
Our experts would be glad to answer any questions you may have:
Dipl.-Ing. Felix Schmitt
Department of Microtechnology
Telephone +49 241 8906-322
felix.schmitt@ilt.fraunhofer.de
Dr. Arnold Gillner
Head, Department of Microtechnology
Telephone +49 241 8906-148
arnold.gillner@ilt.fraunhofer.de
Fraunhofer Institute for Laser Technology ILT
Steinbachstraße 15
52074 Aachen
Germany
Tel. +49 241 8906-0
Fax. +49 241 8906-121

Axel Bauer | Fraunhofer Gesellschaft
Further information:
http://www.ilt.fraunhofer.de
http://www.ilt.fraunhofer.de/eng/100000.html

More articles from Process Engineering:

nachricht Etching Microstructures with Lasers
25.10.2016 | Fraunhofer-Institut für Lasertechnik ILT

nachricht Applying electron beams to 3-D objects
23.09.2016 | Fraunhofer-Institut für Organische Elektronik, Elektronenstrahl- und Plasmatechnik FEP

All articles from Process Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

Im Focus: How to inflate a hardened concrete shell with a weight of 80 t

At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).

Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...

Im Focus: Bacterial Pac Man molecule snaps at sugar

Many pathogens use certain sugar compounds from their host to help conceal themselves against the immune system. Scientists at the University of Bonn have now, in cooperation with researchers at the University of York in the United Kingdom, analyzed the dynamics of a bacterial molecule that is involved in this process. They demonstrate that the protein grabs onto the sugar molecule with a Pac Man-like chewing motion and holds it until it can be used. Their results could help design therapeutics that could make the protein poorer at grabbing and holding and hence compromise the pathogen in the host. The study has now been published in “Biophysical Journal”.

The cells of the mouth, nose and intestinal mucosa produce large quantities of a chemical called sialic acid. Many bacteria possess a special transport system...

Im Focus: Newly proposed reference datasets improve weather satellite data quality

UMD, NOAA collaboration demonstrates suitability of in-orbit datasets for weather satellite calibration

"Traffic and weather, together on the hour!" blasts your local radio station, while your smartphone knows the weather halfway across the world. A network of...

Im Focus: Repairing defects in fiber-reinforced plastics more efficiently

Fiber-reinforced plastics (FRP) are frequently used in the aeronautic and automobile industry. However, the repair of workpieces made of these composite materials is often less profitable than exchanging the part. In order to increase the lifetime of FRP parts and to make them more eco-efficient, the Laser Zentrum Hannover e.V. (LZH) and the Apodius GmbH want to combine a new measuring device for fiber layer orientation with an innovative laser-based repair process.

Defects in FRP pieces may be production or operation-related. Whether or not repair is cost-effective depends on the geometry of the defective area, the tools...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

Nothing will happen without batteries making it happen!

05.01.2017 | Event News

 
Latest News

Solar Collectors from Ultra-High Performance Concrete Combine Energy Efficiency and Aesthetics

16.01.2017 | Trade Fair News

3D scans for the automotive industry

16.01.2017 | Automotive Engineering

Nanoparticle Exposure Can Awaken Dormant Viruses in the Lungs

16.01.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>