Welding railway lines

Metal fusion bonding – Process – Specific mode of heating or applying pressure

Reexamination Certificate

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Details

C228S110100

Reexamination Certificate

active

07922068

ABSTRACT:
This invention relates to a thermite welding process for joining sections of a railway line in situ, the process including the preliminary step of mounting a suitable welding mould about the aligned sections of railway line to be welded together and sealing the mould to prevent run out; mounting a vibration means on the railway line at a suitable distance from the mould and operating it at a suitable frequency; heating the sections of railway line to a desired temperature; igniting an ignitor means and allowing it to drop into the mould to react with molten steel in the mould and fill a weld area about and between the sections of railway line in the mould; and when solidified, to vibrate the railway line for a further period of time until stress relieving of the cast weld area has occurred.

REFERENCES:
patent: 6131801 (2000-10-01), Hagen
patent: 6207920 (2001-03-01), Morlock
patent: 2006/0016858 (2006-01-01), Statnikov et al.
patent: 101372068 (2009-02-01), None
patent: 2383413 (2003-06-01), None
patent: 10-237803 (1998-09-01), None
patent: 2001-333023 (2001-11-01), None
patent: 2004-300898 (2004-10-01), None
patent: 2005-118871 (2005-05-01), None
patent: 2007-175707 (2007-06-01), None
patent: 2008-274414 (2008-11-01), None
patent: 2008-274745 (2008-11-01), None
patent: WO 97/04291 (1997-02-01), None

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