Assessment of Ferritic ODS Steels Obtained by Laser Additive Manufacturing.

This study aims to assess the potential of Laser Additive Manufacturing (LAM) for the elaboration of Ferritic/Martensitic ODS steels. These materials are usually manufactured by mechanical alloying of powders followed by hot consolidation in a solid state. Two Fe-14Cr-1W ODS powders are considered for this study.

[Stenting in superficial femoral artery and usCRP: Multicentric study SAFE in 255 patients].

Objective: To evaluate mid-term primary patency of the femoral artery stenting in correlation with usCRP level and characteristics of the population, morphological aspect of the lesions and interventional techniques.

Methods: Patients were prospectively included in a multicenter study (18 centers in France) after stenting (SMART, Cordis Johnson & Johnson, Issy-les-Moulineaux, France) of the superficial femoral artery (SFA). Inclusion and exclusion criteria were based on recommendations and every day practice of the centers.

Optical techniques for real-time penetration monitoring for laser welding.

Optical techniques for real-time full-penetration monitoring for Nd:YAG laser welding have been investigated. Coaxial light emission from the keyhole is imaged onto three photodiodes and a camera. We describe the spectral and statistical analyses from photodiode signals, which indicate the presence of a full penetration.

Closed-loop power and focus control of laser welding for full-penetration monitoring.

We describe a closed-loop control system ensuring full penetration in welding by controlling the focus position and power of a 4-kW Nd:YAG laser. A focus position monitoring system was developed based on the chromatic aberration of the focusing optics. With the laser power control system we can determine the degree of penetration by analyzing the keyhole image intensity profile.