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Laser micro-spot welding of copper by real-time process monitoring

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Development of friction welding of wood

Bernhard Stamm

For several decades friction welding technology has found broad application in many fields of the metal and plastic connection industry. The fabricated joints are laminar or punctiform depending upon the shape of the parts to be welded. The work presented ...

EPFL2005

Joining wood by friction welding

Bernhard Stamm, Julius Natterer

At the Chair of Timber Constructions of the Swiss Federal Institute of Technology in Lausanne (EPFL) tests were carried out to join wooden work pieces by friction welding without any additional welding deposit. It could be determined that this kind of tech ...

2005

Laser microspot welding of copper

René Salathé, Thomas Sidler, Simone Amorosi

A new procedure for laser spot welding of thin copper stripes was developed based on measuring the calibrated reflectivity coaxially to the laser beam and using this signal for in situ control of the laser power. Experiments with a power ramp of r=3.1 MW/s ...

Laser Institute of America2004

Reliable laser micro-spot welding of copper

René Salathé, Thomas Sidler, Simone Amorosi

Nd:YAG laser welding of high reflectivity metals is difficult because of the highly non-linear light-material interaction yielding a narrow process window and poor reliability. However, achieving high reliability is mandatory for applying this technique in ...

2003

Process for avoiding cracking in welding

Michel Rappaz, Wilfried Kurz, Jean-Daniel Wagnière

The new welding process avoids cracking in welding, in repair welding or in cladding of parts of metallic alloys which are sensitive to hot cracking. The process is using a first heat source (15), directed to the parts (11, 12) of the metallic alloy formin ...

2003

Characterisation and origin of arc fluctuations in a F4 DC plasma torch used for thermal spraying

Christoph Hollenstein

The fluctuating behaviour of a Sulzer Metco F4 DC plasma gun has been investigated. The time dependencies of the arc voltage and current and of the optical emission of the plasma jet have been measured. An optical fibre inside the gun allows direct measure ...

2001

Compact multisensor laser scanning head for processing and monitoring microspot welding

René Salathé, Thomas Sidler, Moustapha Hafez

In order to improve the reliability of micro-spot welding of metal parts in production such as e.g. in electron guns for TV picture tubes, real-time information about the evolution of the welding process should be available to allow on-line modification of ...

SPIE-Int. Soc. Opt. Eng2000

A compact, multi-sensor laser scanning head for processing and monitoring micro-spot welding

René Salathé, Thomas Sidler

2000

Thermocompression assembling device used to connect together a wire with an IC

Mathijs Pieter van der Meer

The conical diamond is retained in material of specific thermal expansion coefficient to ensure that it is not loosened when the temperature rises. The tool comprises a head which includes a small diamond (2) fixed to a support body (3). The diamond has a ...

European Patent Office2000