(19)

(11)

EP 2 667 997 A1

(12)

(43) Date of publication: 04.12.2013 Bulletin 2013/49 (21) Application number: 12703328.0 (22) Date of filing: 24.01.2012

(51) International Patent Classification (IPC):  B23K 9/16(2006.01) B23K 31/02(2006.01) C21D 9/50(2006.01) B23K 20/12(2006.01) B23K 37/00(2006.01) (86) International application number: PCT/GB2012/000064 (87) International publication number: WO 2012/101399 (02.08.2012 Gazette 2012/31)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 26.01.2011 GB 201101379 (71) Applicants: The BOC Group Limited The Surrey Research Park Guildford Surrey GU2 7XY (GB) Tallent Automotive Limited County Durham DL5 6EP (GB) TWI Limited Cambridge, Cambridgeshire CB21 6AL (GB)	(72) Inventors: VELDSMAN, Walter Mark Guildford GU2 7XY (GB) MELTON, Geoffrey, Bernard Cambridge CB21 6AL (GB) O'BRIEN, Roger, William County Durham DL5 6EP (GB) (74) Representative: Christie, Gemma Louise  The Linde Group Intellectual Property 10 Priestley Road The Surrey Research Park Guildford, Surrey GU2 7XY Guildford, Surrey GU2 7XY (GB)