Control of the diffusible hydrogen content in different steel phases through the targeted use of different welding consumables in underwater wet welding. Issue 3 (24th September 2020)

• Record Type: Journal Article
• Authors: Klett, Jan; Mattos, Isabel B. F.; Maier, Hans J.; e Silva, Régis H. G.; Hassel, Thomas
• Is Part Of: Materials and corrosion. Volume 72:Issue 3(2021)
• Page Start: 504
• Page End: 516
• Publication Date: 2020-09-24
• Subjects: arc voltage control -- austenitic hydrogen traps -- diffusible hydrogen -- galvanic corrosion -- hydrogen‐induced cracking (HIC) -- SMAW -- wet welding; Materials -- Periodicals; Metals -- Periodicals; Corrosion and anti-corrosives -- Periodicals; 620.1122305
• DOI: 10.1002/maco.202011963
• Languages: English
• ISSNs: 0947-5117

Abstract

Abstract: Due to the rising number of offshore structures all over the world, underwater wet welding has become increasingly relevant, mainly as a repair method. Welding in direct contact with water involves numerous challenges. A topic focused by many studies is the risk of hydrogen‐induced cracking in wet weldments due to hardness values of up to 500 HV 0.2 in the heat‐affected zone (HAZ) and high levels of diffusible hydrogen in the weld metal. The risk of cracking increases as the equivalent carbon content rises, because the potential to form martensitic structures within the HAZ rises too. Thus, high‐strength steels are especially prone to hydrogen‐induced cracking and are considered unsafe for underwater wet repair weldments. Abstract : Weld metal consisting of different steel phases was created by underwater wet shielded metal arc welding. Samples based on ISO 3690 were welded with one, two, or three weld seams of different electrode grades. The diffusible hydrogen content of these welds was analyzed. Over 90% reduction of diffusible hydrogen could be achieved.