Correlation between the microstructure and corrosion behaviour of copper/316 L stainless-steel dissimilar-metal welded joints

2021 ◽  
pp. 109729
Author(s):  
Youwei Xu ◽  
Xuqian Hou ◽  
Yu Shi ◽  
Wenzhu Zhang ◽  
Yufen Gu ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Welded Joints ◽  
Corrosion Behaviour ◽  
Dissimilar Metal ◽  
316 L Stainless Steel

scholarly journals Electrochemical Impedance Analysis on Cryogenically Treated Dissimilar Metal Welding of 316L Stainless Steel and Monel 400 Alloy Using GTAW

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1088 ◽  
Author(s):  
Cherish Mani ◽  
R Karthikeyan ◽  
Sathish Kannan
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Welded Joints ◽  
Electrochemical Impedance ◽  
Cryogenic Treatment ◽  
Impedance Analysis ◽  
Oil Refining ◽  
Deep Cryogenic Treatment ◽  
Dissimilar Metal ◽  
Monel 400

An attempt was made to study the corrosion behavior of austenitic stainless-steel SS 316L/Monel 400 alloy dissimilar metal welded joints using gas tungsten arc welding. This combination of welded joints is used in re-heaters and heat exchangers in gas processing and oil refining industries. The welded specimens were subjected to post-weld treatments, such as annealing and deep cryogenic treatment. The welded specimens were sectioned into five different parts: SS 316L base, SS 316L HAZ, weld, Monel HAZ, and Monel base. The polarization method and electrochemical impedance analysis were used to analyze the corrosion resistance in a NaCl solution. A polarization graph, Nyquist plot, and Bode plot were constructed for all regions, separately, for the heat-treated and cryo-treated specimens, to analyze the variation in corrosion resistance in different regions, and then the results were compared. To validate the results of electrochemical impedance analysis, scanning electron microscope (SEM) and energy dispersive spectroscope (EDS) analyses were also performed. The results indicated that the cryo-treated specimens have better corrosion resistance when compared to the annealed ones. Weld region on both specimens exhibited better corrosion resistance when compared to other zones.

scholarly journals Corrosion behaviour of stainless steel-titanium alloy linear friction welded joints: Galvanic coupling

2014 ◽  
Vol 66 (2) ◽  
pp. 111-117 ◽  
Author(s):  
A. Astarita ◽  
M. Curioni ◽  
A. Squillace ◽  
X. Zhou ◽  
F. Bellucci ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Titanium Alloy ◽  
Welded Joints ◽  
Corrosion Behaviour ◽  
Galvanic Coupling ◽  
Linear Friction

The Effect of Pre-Hydrogen Charging on Corrosion Behaviour of Superduplex Stainless Steel Welded Joints

2015 ◽  
Vol 227 ◽  
pp. 267-270 ◽  
Author(s):  
Jerzy Łabanowski ◽  
Aleksandra Świerczyńska ◽  
Joanna Michalska
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Weld Metal ◽  
Current Density ◽  
Welded Joints ◽  
Sea Water ◽  
Corrosion Behaviour ◽  
Passive Layer ◽  
Cathodic Current ◽  
Hydrogen Charging

The paper presents results of research undertaken to determine the influence of hydrogen on passivity and corrosion resistance of 2507 super duplex stainless steel welded joints. Butt welded joints were made with low heat input using flux corded arc welding (FCAW) method. Coupons of 5.0 x 5.0 mm were cut from the welded joints containing weld metal (WM), heat affected zone (HAZ) and parent metal (PM). Hydrogen was introduced into the samples by cathodic current method under galvanostatic condition at room temperature. Corrosion resistance was qualified with the polarization curves registered in synthetic sea water. Electrochemical hydrogen charging affected the native passive layer. The internal hydrogen shifted corrosion potential to the more active direction and cause an increase in corrosion current density. The corrosion sensitivity increases for higher current density applied during hydrogen charging. Weld metal area has been revealed as the most sensitive to corrosion attack.

Estimation of Some Mechanical Properties for Similar & Dissimilar Welded Joints

2014 ◽  
Vol 2 (1) ◽  
pp. 59-76
Author(s):  
Abdullah Daie'e Assi
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Austenitic Stainless Steel ◽  
Base Metal ◽  
Welded Joints ◽  
Plate Thickness ◽  
Low Carbon Steel ◽  
Dissimilar Metals ◽  
Low Carbon ◽  
Steel Type

This research deals with the choice of the suitable filler metal to weld the similar and dissimilar metals (Low carbon steel type A516 & Austenitic stainless steel type 316L) under constant conditions such as, plate thickness (6 mm), voltage (78 v), current (120 A), straight polarity. This research deals with three major parts. The first parts Four types of electrodes were used for welding of dissimilar metals (C.St A516 And St.St 316L) two from mild steel (E7018, E6013) and other two from austenitic stainless steel (E309L, E308L) various inspection were carried out include (Visual T., X-ray T., δ- Ferrite phase T., and Microstructures T.) and mechanical testing include (tensile T., bending T. and micro hardness T.) The second parts done by used the same parameters to welding similar metals from (C.St A516) Or (St.St 316L). The third parts deals with welding of dissimilar weldments (C.St And St.St) by two processes, gas tungsten are welding (GTAW) and shielded metal are welding (SMAW).        The results indicated that the spread of carbon from low carbon steel to the welding zone in the case of welding stainless steel elect pole (E309L) led to Configuration Carbides and then high hardness the link to high values ​​compared with the base metal. In most similar weldments showed hardness of the welding area is  higher than the hardness of the base metal. The electrode (E309L) is the most suitable to welding dissimilar metals from (C.St A516 With St.St 316L). The results also showed that the method of welding (GTAW) were better than the method of welding (SMAW) in dissimilar welded joints (St.St 316L with C.St A516) in terms of irregular shape and integrity of the welding defects, as well as characterized this weldments the high-lift and resistance ductility good when using the welding conditions are similar.

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