وزارة التعليم العالي و البحث العلمي

Research center in Industrial Technologies -CRTI-

Patents
Friction Stir Welding tool (FSW) 2007-2014    
AISSANI Mouloud, Saliha GACHI

The expression soudage par friction-malaxage is the accepted translation of Friction Stir Welding in France, its abbreviation is FSW, in Great Britain this name is given to the process ofcontinuous welding by friction. The first patent on this technology was deposited in December 1991 by Thomas Wayne at the British Institute of Welding “The Welding Institute”. It is well known by the acronym TWI. This process originated from “the improvements related to welding by friction», and it continues its development.
More than 400 patents were deposited in Great Britain, in Europe, in the USA and in the world including more than 200 in Japan but none in France, these patents show the activity which is born from the interest that they caused.
Some 60 various organizations (manufacturers, institutes, users) acquired the license.
Many manufacturers offer suitable equipment; Several industrial applications are today engaged including the spectacular welding of rockets tanks.
According to the database, this welding technology does not exist yet in our country’s industry whence the idea of designing and realizing this tool was occurred to us. On December 5th, 2007, this achieved tool was patented, at the level of the national institute of Industrial property (INAPI).

Method for testing the efficiency of gas multi-sensors
ABBAS Abdelaziz, A. Bouabdallah

Chemical gas multi-sensors (or electronic nose) are electronic devices that can be used to detect gas particles, analyse gas mixtures and identify odours. Like all electronic instruments, they are subject to drifts and need often to be calibrated in order to avoid false measurements. In previous published papers, we suggest novel analytical models that describe the steady state interactions between an electronic nose and a mixture of vapours. They relate the variations of the sensors partial sensibilities to gas mixture components concentrations. The deduced models can be used to verify the consistency of experimental sensor array data and so to test the efficiency of the sensor array elements.

Achievement of Barkhausen noise measure and hysteresis tracer
, Mourad ZERGOUG, Omar BOURDJAM & Abdessalam ROUABHA

The objective of this patent is to carry out a device for generating and acquiring the Barkhausen noise in order to detect the defects which the material can contain and to trace the hysteresis loop for determining the magnetic properties of ferromagnetic materials. . This determination will evaluate the materials microstructures starting from electric data and calculated magnetic.

Experimental prototype for the manufacture of composite material plates by the Liquid resin infusion process
DJERIR Wahiba, HALIMI Rafik, BARKAT Hamza, HARHAD Nadia & BADIDI BOUDA Ali

The aim of the invention is to produce a mobile experimental prototype for the manufacture of composite material plates by the Liquid Resin Infusion process (LRI). This process, which has not yet been introduced in the national industry, makes it possible to produce lightweight composite plates with good mechanical properties. The standard fiber volume ratio of the composites produced by this infusion process is 55%. In this device, the use of the adjustable temperature hotplate replaces the autoclaves necessary in the production of composites. In addition, because of the absence of mold on the upper part (nylon or silicone vacuum bag) and the reuse of the lower mold, this process allows producing composite parts at a lower cost under flexible conditions. Our novelty is based on:

  • Mobility of the device which allows its use on site.
  • Absence of the mold on the upper part (nylon or silicone vacuum bag).
  • Infusion of the resin is done automatically by a vacuum pump.
  • Use of the adjustable temperature heating plate by an electric control table. This hot plate replaces the autoclaves required in the production of composites.

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