Liquid Metal-Assisted Cracking During Hot-Dip Galvanizing of Complex Structures: A Case Study

نویسندگان

چکیده

A pipe rack assembly uses hot-dip galvanized trusses joined together by screw connections. The welded were manufactured with ASTM A572 gr.50 W steel profiles. Two of them fractured during the galvanizing bath. fractures presented typical characteristics LMAC — liquid metal-assisted cracking mechanism. In both cases, fracture was located in structural element base metal and followed fillet weld to neighboring elements at a distance beyond heat-affected zone. height greater than depth molten zinc vat, double immersion is required for complete galvanization. failed had particular geometry, distinct from others. design verified taking into account thermal stresses generated partial Among all, only two broken exposed origin substantially higher material yield strength. Metallographic analysis revealed secondary intergranular cracks near surface. crack roots contained zinc. addition, large opening relation depth, which indicates plasticization root region.

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ژورنال

عنوان ژورنال: Journal of Failure Analysis and Prevention

سال: 2021

ISSN: ['1864-1245', '1547-7029']

DOI: https://doi.org/10.1007/s11668-021-01211-w