Concept

Soudage laser

Publications associées (44)

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Soudage laser or-acier

Denis Favez

In jewelry manufacturing, joining dissimilar materials is usually achieved by brazing or soldering, in which the materials comprising the joint are heated to a suitable temperature in the presence of a filler metal having a liquidus below the solidus of th ...

EPFL2009

Micro- and macrosegregation of a peritectic Au-Fe alloy during Bridgman solidification

Michel Rappaz, Denis Favez

In jewelry manufacturing, joining dissimilar materials is usually achieved by soldering or brazing, but these techniques have several disadvantages as compared for example with laser welding. In this last case, however, it is necessary to have a thorough u ...

Minerals, Metals & Materials Soc, 184 Thorn Hill Rd, Warrendale, Pa 15086-7514 Usa2009

Nd:YAG laser joining between stainless steel and nickel-titanium shape memory alloys

Michel Rappaz, Aïcha Hessler-Wyser, Jonas Vannod

Nickel-Titanium (NiTi) shape memory alloys are often used in medical component devices, for instance as guide wires for neurological surgery applications. The manufacture of such devices becomes more and more challenging, especially considering the need to ...

2008

H2O2 generation by decamethylferrocene at a liquid | liquid interface

Hubert Girault, Michel Prudent, Bin Su, Mohamad Hojeij, Raheleh Partovi Nia, Zdenek Samec

Hydrogen peroxide generation at a liquid|liquid interface occurs with a yield of 20 % with respect to the concentration of reducing agent (decamethylferrocene). The liquid|liquid interface supplies electrons from the reducing agent and protons from the aqu ...

2008

Application of the Rappaz-Drezet-Gremaud Hot Tearing Criterion to Welding of Aluminium Alloys

Jean-Marie Drezet

Hot tearing, a severe defect occurring during solidification is the conjunction of tensile stresses which are transmitted to the mushy zone by the coherent solid underneath and of insufficient liquid feeding to compensate for the volumetric change. The RDG ...

Th. Böllinghaus, H. Herold, C. E. Cross and J.C Lippold2008

Experimental study on the fatigue behaviour of welded tubular K-joints for bridges

Alain Nussbaumer, Ann Schumacher

Fatigue tests were carried out on welded circular hollow section K-joints typical to bridges. The tests specimens were large-scale (approximately 9 m long and 2 m high) trusses loaded in the plane of the truss. Measured member stresses showed that a signif ...

Elsevier2006

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

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

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

Simone Amorosi

A new laser micro-spot welding procedure for copper has been developed in order to eliminate the shortcomings of existing techniques based on laser pulse shaping or in-situ temperature control. This procedure consists in dividing the welding process in fou ...

EPFL2004

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