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1. (WO2006123069) DEVICE FOR CENTRING AND CLAMPING TUBULAR PARTS, COMPRISING MEANS FOR REGULATING THE GAS FLOW RATE IN ORDER TO CONTROL THE OXYGEN CONTENT

Pub. No.:    WO/2006/123069    International Application No.:    PCT/FR2006/001158
Publication Date: Nov 23, 2006 International Filing Date: May 22, 2006
IPC: B23K 37/053
B23K 9/028
B23K 9/16
B23K 9/32
Applicants: SERIMAX
RICHARD, Gilles
L'ARVOR, Eric
Inventors: RICHARD, Gilles
L'ARVOR, Eric
Title: DEVICE FOR CENTRING AND CLAMPING TUBULAR PARTS, COMPRISING MEANS FOR REGULATING THE GAS FLOW RATE IN ORDER TO CONTROL THE OXYGEN CONTENT
Abstract:
The invention relates to a device for centring and clamping conduits which are preferably made from alloy steel and which are positioned end to end in order to be welded to form a pipeline. The invention comprises: means for centring and clamping two conduits that are to be welded, optional leak-tight partition means which define an inerting chamber at the mating surface, and inert gas distribution means for creating a protective atmosphere at the mating surface. The inventive device also comprises at least means for regulating the flow of inert gas and/or the supply pressure of said inert gas as a function of the concentration of O2 measured in the protective atmosphere and/or the pressure measured within said atmosphere, such as to maintain the O2 content of the atmosphere below a pre-determined alarm threshold value and/or the pressure of the atmosphere below a pre-determined threshold value.