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ASM Failure Analysis Case Histories

Handbook of Case Histories in Failure Analysis

Edited by
Khlefa A. Esaklul
Khlefa A. Esaklul
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ASM International
Volume
2
ISBN electronic:
978-1-62708-215-0
Publication date:
1993
Book Chapter

Failure of a Reformer Tube Weld by Cracking

By
Sergio N. Monteiro
Sergio N. Monteiro
COPPE—Federal University of Rio de Janeiro
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;
Paulo Augusto M. Araujo
Paulo Augusto M. Araujo
COPPE—Federal University of Rio de Janeiro
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Published:
1993
Page range:
498 - 501

Abstract

An HK-40 alloy tubing weld in a reformer furnace of a petrochemical plant failed by leaking after a shorter time than that predicted by design specifications. Leaking occurred because of cracks that passed through the thickness of the weldment. Analysis of the cracked tubing indicated that the sulfur and phosphorus contents of the weld metal were higher than specified, the thickness was narrower at the weld, and the mechanical resistance of the weld metal was lower than specified. Cracking initiated at the weld root by coalescence of creep cavities. Propagation and expansion was aided by internal carburization. Quality control of welding procedures and filler metal was recommended.

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Sergio N. Monteiro, Paulo Augusto M. Araujo, 1993. "Failure of a Reformer Tube Weld by Cracking", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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