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753 views Technical Discussions Nigel Engineering, - Specialist services United Kingdom, Joined Oct 2000, 1096 Nigel Engineering, - Specialist services United Kingdom, Joined Oct 2000 1096 00:14 Oct-12-2006 Looking for root erosion in thin-walled duplex stainless steel welds We have air coolers on our plant (oil & gas) part of which consists of a row of 1 inch dia, 1,6 mm to 3,5 mm wall thickness duplex (22% Cr, UNS31803) tubes TIG welded with matching filler metal to an 8 inch duplex header (wt 11 - 18mm). Weld ferrite content range 35% - 65%. I am no corrosion engineer but it seems that duplex is susceptible to weld root erosion or cracking in case of wet-upset in an H2S environment. So we wish to check the weld roots for such whilst new equipment fabricated from material more-suited to the potential environment are procured. A simulation test rig of one header with 4 or 5 tubes welded in place is being made for performance demonstration purposes. Do anybody have experience of such configurations? Is low-frequency eddy current a possibility? Or DC MPI - knowing that the permeability variations may produce non-relevant indications. As the material/configuration set-up is difficult to inspect I expect signal interpretation and evaluation will be a problem. Any ideas?         Reply  Translate  Close   Sayed H. El-Nekhaly R & D Delta Steel Mill Company, Egypt, Joined Jun 2006, 7 Sayed H. El-Nekhaly R & D Delta Steel Mill Company, Egypt, Joined Jun 2006 7 05:52 Oct-20-2006 Re: Looking for root erosion in thin-walled duplex stainless steel welds This type of corrosion known as intergranular corrosion. It result due to depletion of chromium to be concentrated on grain boundaries during welding of high chromium stailess steel. Traces of nitrogen within range (0.1 - 0.5%) added as alloying element in duplex stainless steel can prevent this type of corrosion. The mechanism occured by catching chromium as chromium nitrid which prevent depletion then corrosion cracking.         Reply  Translate  Close   Product Spotlight GEKKO - Portable Phased Array Testing with TFM in Real-Time StandKARL DEUTSCH The portable phased array testing system GEKKO provides 64 parallel test channels. On creating testi ... ng parameters the operator is assisted by the CIVA software. Due to its modular set-up the GEKKO instrument is suitable for operators of all skill levels. > 4 Showcases5 Videos IntraPhase Athena Phased Array System StandWesDyne International (AMDATA Products) The Athena Phased Array system, manufactured by WesDyne NDE Products & Technology, consists of a pha ... sed array acquisition system and PC running IntraSpect software. A PC is used to perform acquisition, analysis and storage of the data. System hardware is capable of operating up to four data sets with any combination of phased array or conventional UT probes. NOW AVAILABLE IN 64-64 CONFIGURATION. > 9 Showcases Navic - Steerable Modular Automated Scanner StandJIREH Industries The Navic is a modular, motorized, steerable scanner designed to carry multiple attachments used ... in various scanning and inspection applications. The Navic is capable of weld scanning (girth welds and long seam welds), automated corrosion mapping, and tank scanning. > 5 Showcases5 Videos Teletest Focus+ StandTeletest Teletest Focus+ electronics have superior capabilities than rivals on the market. Beyond the usual ... test features, Focus+ has 24 transmit channels and 24 receive channels, with an additional on-board switching capabilities. The instrument's frequency range is 10–300 kHz. > 2 Videos more Showcases Share... Home Exhibition Archive Forum Jobs Members Events Directory NDT A-Z Advertise Privacy Policy Contact About © NDT.net - Where expertise comes together. The Largest Open Access Portal of Nondestructive Testing (NDT)- since 1996 We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info Accept top this is debug window