Microstructural and Corrosion Resistance of Lean Duplex Stainless Steel UNS S32304 Welded by SAW with Cold Wire Addition

CORROSION ◽  
10.5006/3468 ◽  
2020 ◽  
Vol 76 (7) ◽  
pp. 619-627
Author(s):  
Neice Ferreira dos Santos ◽  
Luiza Esteves ◽  
João Henrique Nery Garcia ◽  
Ronaldo Cardoso Júnior ◽  
Paulo José Modenesi ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Duplex Stainless Steel ◽  
Heat Input ◽  
Arc Welding ◽  
Lower Amount ◽  
Lean Duplex Stainless Steel ◽  
Cold Wire ◽  
Chloride Environment ◽  
Submerged Arc

The results of the corrosion tests, in chloride environment, of lean duplex stainless steel UNS S32304 welded by submerged arc welding (SAW) process variant with cold wire, indicated that the sample with higher heat input heat input (HI) (2.7 kJ/mm) had higher corrosion resistance, which can be explained by higher amount of austenite and lower amount of precipitates. Therefore, the results indicate that the use of HI above the limit recommended by literature (2.5 kJ/mm) may produce welds with adequate corrosion resistance with SAW with cold wire addition, because this technique has the potential to deliver higher productivity still controlling the process HI.

Effect of heat input on the corrosion resistance of the cold worked 2304 lean duplex stainless steel GMAW welded joint

2018 ◽  
Vol 70 (3) ◽  
pp. 409-418 ◽  
Author(s):  
Carla S. Souza ◽  
Renata B. Soares ◽  
Ricardo A. D. de Faria ◽  
Alexandre Q. Bracarense ◽  
Maria das M.R. Castro ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Duplex Stainless Steel ◽  
Heat Input ◽  
Welded Joint ◽  
Lean Duplex Stainless Steel ◽  
Cold Worked

scholarly journals Corrosion Resistance and Mechanical Properties of TIG and A-TIG Welded Joints of Lean Duplex Stainless Steel S82441 / 1.4662

2016 ◽  
Vol 61 (2) ◽  
pp. 771-784 ◽  
Author(s):  
Z. Brytan ◽  
J. Niagaj
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Duplex Stainless Steel ◽  
Pitting Corrosion ◽  
Welded Joints ◽  
Heat Input ◽  
Filler Metal ◽  
Tig Welding ◽  
Lean Duplex Stainless Steel ◽  
Pitting Corrosion Resistance

Abstract This paper presents results of pitting corrosion resistance of TIG (autogenous and with filler metal) and A-TIG welded lean duplex stainless steel S82441/1.4662 evaluated according to ASTM G48 method, where autogenous TIG welding process was applied using different amounts of heat input and shielding gases like pure Ar and Ar+N2 and Ar+He mixtures. The results of pitting corrosion resistance of the welded joints of lean duplex stainless steel S82441 were studied in as weld conditions and after different mechanical surface finish treatments. The results of the critical pitting temperature (CPT) determined according to ASTM G48 at temperatures of 15, 25 and 35°C were presented. Three different surface treatment after welding were applied: etching, milling, brushing + etching. The influence of post weld surface treatment was studied in respect to the pitting corrosion resistance, basing on CPT temperature. Research on TIG welding of lean duplex stainless steel S82441/1.4662 showed a clear influence of the applied shielding gas mixtures, where the addition of 5 to 15% N2 to Ar virtually no effect on the level of resistance to pitting corrosion, only 5% N2 addition has a positive effect, while use of a mixture of 50% Ar + 50% He compared with welding at 100% Ar atmosphere, can significantly reduce the resistance to pitting corrosion. Definite good results were obtained during TIG welding with the participation of activation flux (A-TIG). The weld surface of lean duplex stainless S82441/1.4662 obtained in A-TIG welding without the addition of filler metal has a much lower tendency to pitting corrosion than traditional welds made by TIG method. Pitting corrosion resistance of welds made by A-TIG improved with the increase of the heat input in the tested range of welding current 100-200 A. It was also found that the intensity of the occurrence of pitting does not affect the method of cleaning welds after welding, but the mechanical removal of a thin surface layer of metal significantly reduces their intensity.

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