LEAK-TIGHT WELDING EXPERIENCE FROM THE INDUSTRIAL ASSEMBLY OF THE LHC CRYOSTATS AT CERN | Zendy

Nicolas Bourcey | Zendy; Paulo Eduardo Fonseca de Campos | Zendy; Paolo Chiggiato | Zendy; P. Limon | Zendy; A. Mongelluzzo | Zendy; G. Musso | Zendy; A. Poncet | Zendy; V. Parma | Zendy; J. G. Weisend | Zendy; John Barclay | Zendy; Susan Breon | Zendy; Jonathan Demko | Zendy; Michael DiPirro | Zendy; J. Patrick Kelley | Zendy; Peter Kittel | Zendy; Arkadiy Klebaner | Zendy; Al Zeller | Zendy; Mark Zagarola | Zendy; Steven Van Sciver | Zendy; Andrew Rowe | Zendy; John Pfotenhauer | Zendy; Tom Peterson | Zendy; Jennifer Lock | Zendy

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LEAK-TIGHT WELDING EXPERIENCE FROM THE INDUSTRIAL ASSEMBLY OF THE LHC CRYOSTATS AT CERN

Author(s) -

Nicolas Bourcey,

Paulo Eduardo Fonseca de Campos,

Paolo Chiggiato,

P. Limon,

A. Mongelluzzo,

G. Musso,

A. Poncet,

V. Parma,

J. G. Weisend,

John Barclay,

Susan Breon,

Jonathan Demko,

Michael DiPirro,

J. Patrick Kelley,

Peter Kittel,

Arkadiy Klebaner,

Al Zeller,

Mark Zagarola,

Steven Van Sciver,

Andrew Rowe,

John Pfotenhauer,

Tom Peterson,

Jennifer Lock

Publication year - 2008

Publication title -

aip conference proceedings

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.177

H-Index - 75

eISSN - 1551-7616

pISSN - 0094-243X

DOI - 10.1063/1.2908564

Subject(s) - welding , cryostat , leak , piping , large hadron collider , materials science , nuclear engineering , quality assurance , leak detection , mechanical engineering , environmental science , engineering , metallurgy , nuclear physics , physics , operations management , superconductivity , external quality assessment , quantum mechanics , environmental engineering

The assembly of the approximately 1700 LHC main ring cryostats at CERN involved extensive welding of cryogenic lines and vacuum vessels. More than 6 km of welding requiring leak tightness to a rate better than 1.10−9 mbar⋅l⋅s−1 on stainless steel and aluminium piping and envelopes was made, essentially by manual welding but also making use of orbital welding machines. In order to fulfill the safety regulations related to pressure vessels and to comply with the leak-tightness requirements of the vacuum systems of the machine, welds were executed according to high qualification standards and following a severe quality assurance plan. Leak detection by He mass spectrometry was extensively used. Neon leak detection was used successfully to locate leaks in the presence of helium backgrounds.This paper presents the quality assurance strategy adopted for welds and leak detection. It presents the statistics of non-conformities on welds and leaks detected throughout the entire production and the advances in the us...

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