Server maintenance is scheduled for Saturday, December 21st between 6am-10am CST.

During that time, parts of our website will be affected until maintenance is completed. Thank you for your patience.

Menu
Search
Filters
Close
Menu

Use GIVING24 at checkout to save 20% on eCourses and books (some exclusions apply)!

Welding Of CRA With Insufficient Purging Gas Impact On Mechanical Properties And Corrosion Resistance

Picture for Welding Of CRA With Insufficient Purging Gas Impact On Mechanical Properties And Corrosion Resistance
Available for download
Product Number: 51321-16615-SG
Author: Kristian Eriksen/ Roy Johnsen/ Stian Hauger
Publication Date: 2021
$0.00
$20.00
$20.00

During fabrication of piping systems discoloration (heat tint) in access of that accepted by welding standards such as Norsok M-601 is sometimes experienced.1 This is normally a result of insufficient purging gas. The effect on mechanical properties and corrosion resistance were investigated. Pipe spools made from 22Cr duplex stainless steel, 25Cr duplex stainless steel and titanium Gr. 2 were welded using argon purging gas with mixed-in oxygen at various concentrations to simulate insufficient purging. The mechanical testing included tensile testing, impact testing and hardness measurements while the corrosion testing included ASTM G482 – Method A pitting tests, critical pitting temperature measurements in simulated seawater and critical pitting potential measurements in simulated well fluids according to ASTM G61. 14 The results from tensile testing, impact testing and hardness measurements showed that the tested materials were virtually unaffected by the purging gas conditions, except when welded with no purging gas at all. The corrosion testing also showed that the materials were more or less unaffected by the purging gas conditions, both in seawater service and in hydrocarbon service. The main conclusion of the work is that the integrity of piping systems in 22Cr duplex stainless steel, 25Cr duplex stainless steel and titanium Gr. 2 does not seem to be compromised by insufficient purging, as long as some level of purging gas is used for butt welds.

Keywords: Welding, Purging gas, Heat tint, Duplex Stainless Steel, Titanium, Pitting Corrosion, Seawater systems, Hydrocarbon systems

During fabrication of piping systems discoloration (heat tint) in access of that accepted by welding standards such as Norsok M-601 is sometimes experienced.1 This is normally a result of insufficient purging gas. The effect on mechanical properties and corrosion resistance were investigated. Pipe spools made from 22Cr duplex stainless steel, 25Cr duplex stainless steel and titanium Gr. 2 were welded using argon purging gas with mixed-in oxygen at various concentrations to simulate insufficient purging. The mechanical testing included tensile testing, impact testing and hardness measurements while the corrosion testing included ASTM G482 – Method A pitting tests, critical pitting temperature measurements in simulated seawater and critical pitting potential measurements in simulated well fluids according to ASTM G61. 14 The results from tensile testing, impact testing and hardness measurements showed that the tested materials were virtually unaffected by the purging gas conditions, except when welded with no purging gas at all. The corrosion testing also showed that the materials were more or less unaffected by the purging gas conditions, both in seawater service and in hydrocarbon service. The main conclusion of the work is that the integrity of piping systems in 22Cr duplex stainless steel, 25Cr duplex stainless steel and titanium Gr. 2 does not seem to be compromised by insufficient purging, as long as some level of purging gas is used for butt welds.

Keywords: Welding, Purging gas, Heat tint, Duplex Stainless Steel, Titanium, Pitting Corrosion, Seawater systems, Hydrocarbon systems

Product tags
Also Purchased
Picture for Sulfide Stress Cracking Of Low Alloy Steels For Oil And Gas Production: Revisiting The Effect Of Ni As An Alloying Element
Available for download

Sulfide Stress Cracking Of Low Alloy Steels For Oil And Gas Production: Revisiting The Effect Of Ni As An Alloying Element

Product Number: 51321-16549-SG
Author: Dannisa R. Chalfoun/ Ricardo M. Carranza/ Luis A. Aguirre/ Teresa E. Perez/ Mariano Iannuzzi/ Mariano A. Kappes/
Publication Date: 2021
$20.00
Picture for 96601 FABRICATION, WELDING AND HEAT TREATMENT
Available for download

96601 FABRICATION, WELDING AND HEAT TREATMENT OF NICKEL ALLOYS

Product Number: 51300-96601-SG
ISBN: 96601 1996 CP
Author: C.S. Tassen, G.D. Smith, S.K. Mannan, E.B. Hinshaw
$20.00
Picture for E - Log I tests on oil Production Wells Case Study
Available for download

E - Log I tests on oil Production Wells Case Study

Product Number: 51321-16266-SG
Author: Manuela Nimmervoll/Gregor Mori/Roland Haubner/Stefan Hönig/Wolfgang Hofer
Publication Date: 2021
$20.00
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support