Safe and ergonomic welding masks by fast liquid crystals
Artikel i vetenskaplig tidskrift, 2008

Recent developments in welding technology, in particular the high intensity pulsed welding arc, have sharpened the requirements on speed and adjustable attenuation for safe and ergonomic operations. With this advent the conventional welding helmets based on nematic liquid crystals are facing difficulties because the nematics are not responding fast enough to stroboscopically follow the changing intensity of the arc during pulsed welding. We propose here a new generation of welding shutters based on smectic (ferroelectric or antiferroelectric) liquid crystals which are fast enough to be synchronized to follow pulsed arc regimes and hence permitting a better visibility of the object under work. The two varieties of smectic materials used are polymer-stabilized in order to make the device shock-proof, to prevent the formation of specific defects such as stripes and chevrons, and to reduce the back-relaxation time in the antiferroelectric case.

ferroelectric and antiferroelectric liquid crystals

visor

pulsed welding

Welding helmets

Författare

B. Caillaud

LIXYS SA

Telecom Bretagne

L. Dupont

Telecom Bretagne

LIXYS SA

P. Gautier

Telecom Bretagne

LIXYS SA

J.-L. de Bougrenet de la Tocnaye

LIXYS SA

Telecom Bretagne

Per Rudquist

Chalmers, Mikroteknologi och nanovetenskap (MC2), Elektronikmaterial och system

Pontus Jägemalm

Chalmers, Mikroteknologi och nanovetenskap (MC2)

Sven Lagerwall

Chalmers University of Technology

Molecular Crystals and Liquid Crystals

1542-1406 (ISSN) 1543-5318 (eISSN)

Vol. 494 195-204

Ämneskategorier

Materialteknik

Fysik

Elektroteknik och elektronik

DOI

10.1080/15421400802430034