Materials & Welding

Gentlemen excuse me if I have interrupted. This is a  Forum where everybody shares their  Technical knowledge and experience so that it is useful to the concerned. Sometimes we may be wrong also and take it sportively without being offended. Argon + 2% N2 mixture is highly recommended for purging and shielding for the below purposes. 1.  Nitrogen is an Austenite stabilizer and promotes Austenite formation in the duplex matrix. 2. It improves Pitting corrosion resistance. 3. The maximum solubility of Nitrogen in DSS A32205 is 0.2% and anything more than that will come out of the solution. 4. Nitrogen delays the formation of Intermetallic phases.   "> 5. Nitrogen may be more efficient in aiding ASTM G48 corrosion test. But in ASTM A923, the weight loss is mainly due to Intermetallic Phases as higher PREN electrodes used such as Super duplex and Nickel base electrodes does not cause in weight loss due to pitting corrosion. I feel the main reason is higher alloy contents...

Share to me all run sheet records  Sent from my iPhone On 19 Jul 2023, at 08:10, Ashish Chacko <iamashleo007@gmail.com> wrote: Kindly find the attachment for test report On Wednesday, 19 July 2023 at 08:03:57 UTC+3 Pham Thanh Tinh wrote: Hi  Send to me all PQT report from your conduct I will support to you. Vào Th 3, 18 thg 7, 2023 vào lúc 08:26 Ashish Chacko < iamash...@gmail.com > đã viết: I am currently working on developing a Procedure Qualification Record (PQR) for Duplex Steel. In the process, I conducted welding using the base material SA 790 (UNS:32205) and utilized two different filler wires: ER-2594 and ER-Nicr-Mo-14 for different coupons. Size of the coupon 6" Thick:10.97 mm. However, I encountered a concern during the corrosion testing phase, as per ASTM A923-03 standards. Both test materials failed the corrosion test. I'm seeking guidance from the experts in this group to understand the possible reasons for the failure and to explore potential solut...

HI Ashish Chacko You may use 87% Argon + 10%Helium +3% Nitrogen. (as backing and shielding) Maintain inter pass temperature below 100 C.  Use ER2594 Filler Wire (ESAB or DAIKO Brand) Most importantly, make sure you do pickling and passivation after welding, for the time specified for Super duplex materials. ( you will find the time in  pickling and passivation gel itself. We used S weld gel) Im sure you will reap the result. we got Corrosion value as = 0 MDD Thanks and Regards Aneesh Kizhakkekalam QA/QC Manager (Saudi Aramco Project) On Tuesday, July 18, 2023 at 8:26:20 AM UTC+3 Ashish Chacko wrote: I am currently working on developing a Procedure Qualification Record (PQR) for Duplex Steel. In the process, I conducted welding using the base material SA 790 (UNS:32205) and utilized two different filler wires: ER-2594 and ER-Nicr-Mo-14 for different coupons. Size of the coupon 6" Thick:10.97 mm. However, I encountered a concern during the corrosion testing phase, as per ASTM A923-0...

Kindly find the attachment for test report On Wednesday, 19 July 2023 at 08:03:57 UTC+3 Pham Thanh Tinh wrote: Hi  Send to me all PQT report from your conduct I will support to you. Vào Th 3, 18 thg 7, 2023 vào lúc 08:26 Ashish Chacko < iamash...@gmail.com > đã viết: I am currently working on developing a Procedure Qualification Record (PQR) for Duplex Steel. In the process, I conducted welding using the base material SA 790 (UNS:32205) and utilized two different filler wires: ER-2594 and ER-Nicr-Mo-14 for different coupons. Size of the coupon 6" Thick:10.97 mm. However, I encountered a concern during the corrosion testing phase, as per ASTM A923-03 standards. Both test materials failed the corrosion test. I'm seeking guidance from the experts in this group to understand the possible reasons for the failure and to explore potential solutions or alternative approaches. If anyone has experience with similar issues or insights into the matter, I would greatly appreciate y...

Hi  Send to me all PQT report from your conduct I will support to you. Vào Th 3, 18 thg 7, 2023 vào lúc 08:26 Ashish Chacko < iamashleo007@gmail.com > đã viết: I am currently working on developing a Procedure Qualification Record (PQR) for Duplex Steel. In the process, I conducted welding using the base material SA 790 (UNS:32205) and utilized two different filler wires: ER-2594 and ER-Nicr-Mo-14 for different coupons. Size of the coupon 6" Thick:10.97 mm. However, I encountered a concern during the corrosion testing phase, as per ASTM A923-03 standards. Both test materials failed the corrosion test. I'm seeking guidance from the experts in this group to understand the possible reasons for the failure and to explore potential solutions or alternative approaches. If anyone has experience with similar issues or insights into the matter, I would greatly appreciate your assistance. -- https://materials-welding.blogspot.com/ https://www.linkedin.com/groups/12278...

Better try with ER347 Filler wire.for duplex steel this filler material is suitable. T/R On Tue, 18 Jul 2023, 10:56 Ashish Chacko, < iamashleo007@gmail.com > wrote: I am currently working on developing a Procedure Qualification Record (PQR) for Duplex Steel. In the process, I conducted welding using the base material SA 790 (UNS:32205) and utilized two different filler wires: ER-2594 and ER-Nicr-Mo-14 for different coupons. Size of the coupon 6" Thick:10.97 mm. However, I encountered a concern during the corrosion testing phase, as per ASTM A923-03 standards. Both test materials failed the corrosion test. I'm seeking guidance from the experts in this group to understand the possible reasons for the failure and to explore potential solutions or alternative approaches. If anyone has experience with similar issues or insights into the matter, I would greatly appreciate your assistance. -- https://materials-welding.blogspot.com/ https://www.linkedin.com/groups/12...

Greetings, In pas we faces same issue and after that we get recommendations from test laboratories to use mixture gases for shielding and purging. Argon + 2% Nitrogen mixer with ER2594 filler wire.a  Babur Khan Lashari  Sent from my iPhone On 18 Jul 2023, at 2:16 PM, Ashish Chacko <iamashleo007@gmail.com> wrote: Backimh and shieldimg gas was argon grade 4.7 b ( 99.997%) On Tuesday, 18 July 2023 at 11:10:50 UTC+3 Vishwas Keskar wrote: What was the backing and shielding gas ? Sent from my iPhone On 18-Jul-2023, at 10:56 AM, Ashish Chacko < iamash...@gmail.com > wrote:  I am currently working on developing a Procedure Qualification Record (PQR) for Duplex Steel. In the process, I conducted welding using the base material SA 790 (UNS:32205) and utilized two different filler wires: ER-2594 and ER-Nicr-Mo-14 for different coupons. Size of the coupon 6" Thick:10.97 mm. However, I encountered a concern during the corrosion testing phase, as per ASTM A923-03 standards. Bo...