Publication

Characterisation of Laser Welds, between Nitinol and Stainless Steel Wires

Michel Rappaz, Aïcha Hessler-Wyser
2009
Posters

Abstract

Nickel-Titanium (NiTi) shape memory alloys are often used in medical component devices, for instance as guide wires for neurological surgery applications. Manufacturing of such devices becomes more and more challenging, especially considering the need to join them with other metals, like Stainless Steel (SS). Laser welding is a promising technique to realize and to guaranty the mechanical stability of dissimilar metal welds. However, inherent differences in chemical compositions may lead to fracture of the weld due to the formation of brittle intermediate phases, such as TiFe or TiFe2. So it is important to characterise microstructure in a very efficient way. Both, pulsed Nd:YAG and continuous fibre laser were experimented to produce sound welds with sufficient tensile strength. Transmission (TEM) and Scanning Electron Mi- croscopy (SEM) were used to observe microstructure. Diffraction and Energy Dispersive Spectrometry (EDS) were used to determine phase structure and composition.

Official source

https://infoscience.epfl.ch/entities/publication/d45bdc77-d275-4d04-982b-6e7494d911aa

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Michel Rappaz, Aïcha Hessler-Wyser
2009
Posters

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/d45bdc77-d275-4d04-982b-6e7494d911aa

About this result

Related concepts (32)

Welding

Welding is a fabrication process that joins materials, usually metals or thermoplastics, by using high heat to melt the parts together and allowing them to cool, causing fusion. Welding is distinct from lower temperature techniques such as brazing and soldering, which do not melt the base metal (parent metal). In addition to melting the base metal, a filler material is typically added to the joint to form a pool of molten material (the weld pool) that cools to form a joint that, based on weld configuration (butt, full penetration, fillet, etc.

Stainless steel

Stainless steel, also known as inox or corrosion-resistant steel (CRES), is an alloy of iron that is resistant to rusting and corrosion. It contains at least 10.5% chromium and usually nickel, and may also contain other elements, such as carbon, to obtain the desired properties. Stainless steel's resistance to corrosion results from the chromium, which forms a passive film that can protect the material and self-heal in the presence of oxygen. The alloy's properties, such as luster and resistance to corrosion, are useful in many applications.

Laser beam welding

Laser beam welding (LBW) is a welding technique used to join pieces of metal or thermoplastics through the use of a laser. The beam provides a concentrated heat source, allowing for narrow, deep welds and high welding rates. The process is frequently used in high volume and precision requiring applications using automation, as in the automotive and aeronautics industries. It is based on keyhole or penetration mode welding.

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Characterisation of Laser Welds, between Nitinol and Stainless Steel Wires

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