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Removal of weld oxides from stainless steel: The efficiency of electrolytical cleaning and laser ablation
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2024 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Currently, chemical pickling is used to remove the weld oxides from the surface of welded stainless steels. The present investigation aims to assess the efficiency of electrolytic cleaning and laser ablation on restoring the corrosion resistance properties.

The core study was conducted on MAG-welded (metal active gas welding method) plates of austenitic stainless steels – 316L and 254SMO, and duplex stainless steels – 2101, 2205 and 2507.The corrosion pitting temperature was measured using ASTM G-150 testing for each steel after each cleaning trial. Electrolytic cleaning proved to be as efficient as chemical pickling for the high-alloyed stainless steels. On the other hand, laser ablation was not as successful, probably due to weld oxides still present on the surface after the cleaning trials.

Electrolytical cleaning is a promising method that could be used in an industry scale as it can be easily taught and has been developed to be performed on-site. More laser trials should be conducted to accurately conclude on the efficiency of this method as there is still a lack of understanding of the effect of different laser settings on different types of alloys

Abstract [sv]

För närvarande används kemisk betning för att återställa korrosionsegenskaperna hos svetsade rostfria stål. Denna undersökning syftar till att bedöma effektiviteten av elektrolytisk rengöring och laserablation vid avlägsnande av svetsoxider.

Huvudstudien utfördes på MAG-svetsade (metal active gas welding) plåtar av austenitiska rostfriastål – 316L och 254SMO, samt duplex rostfria stål – 2101, 2205 och 2507. Kritisk temperatur för punktfrätning uppmättes med ASTM G-150-testning för varje stål efter varje rengöringsförsök. Elektrolytisk rengöring visade sig vara lika effektiv som kemisk betning för de höglegerade rostfria stålen. Däremot var laserablation inte lika framgångsrik, troligen eftersom svetsoxider fortfarande var synliga på ytan efter rengöringsförsöken.

Elektrolytisk rengöring är en lovande metod som skulle kunna användas i industriell skala, eftersom den är lätt att lära sig och har utvecklats för att utföras på plats. Fler laserförsök bör genomföras för att noggrant kunna dra slutsatser om metodens effektivitet, eftersom det fortfarande finns en bristande förståelse för effekten av olika parameterinställningar på olika typer av legeringar.

Place, publisher, year, edition, pages
2024. , p. 65
Series
TRITA-ITM-EX ; 2024:549
Keywords [en]
stainless steel; welding; corrosion pitting temperature; weld oxides; chemical pickling; electrolytical cleaning; laser ablation
Keywords [sv]
rostfritt stål; svetsning; punktfrätning; svetsoxider; kemisk betning; elektrolytisk rengöring; laserablation
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:kth:diva-355273OAI: oai:DiVA.org:kth-355273DiVA, id: diva2:1908336
External cooperation
Swerim AB
Subject / course
Materials and Process Design
Educational program
Master of Science in Engineering
Supervisors
Examiners
Available from: 2024-10-25 Created: 2024-10-25 Last updated: 2024-10-25Bibliographically approved

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