Problems with reliability and safety of hot dip galvanized steel structures

Mraz, Lubos; Lesay, J.

doi:10.1590/s0104-92242009000200011

Cited by 10 publications

(4 citation statements)

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“…Especially the welding process is known to introduce hydrogen microcracks, when executed in suboptimal conditions [14]. It is recommended not to exceed hardness values above a certain threshold (±300 HV) [15], [2]. Several guides and standards have been written, e.g.…”

Section: 4mentioning

confidence: 99%

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LME susceptibility of galvanised welded structures of high strength steels

Vermeersch¹,

Waele²,

Caenegem³

2011

IJSMED

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Hot dip galvanizing is a very popular and well known process in corrosion protection of steel.However, very occasionally, cracks appear on structures when they leave the zinc bath. The responsiblecrack phenomenon appears to be liquid metal embrittlement. This phenomenon is already known for a longtime, but it is still not yet fully understood. The lack of fundamental theoretical knowledge and the absenceof accurate models to predict liquid metal embrittlement oblige engineers to set up extensive test programsto determine an area of process parameters in which safe design is guaranteed. A qualitativeunderstanding of the various influencing parameters during galvanizing is necessary to explain theoccurrence of liquid metal embrittlement. This knowledge is also helpful to design an experimental test setup and procedure for evaluating the influence of one parameter where the effect of other parameters shouldremain constant. This master thesis deals with the occurrence of liquid metal embrittlement whengalvanizing welded high strength steels. This paper gives an overview of the most important processparameters and gives a short description of possible future experimental work.

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Section: 4mentioning

confidence: 99%

“…Several guides and standards have been written, e.g. EN 1011-2, that can be followed in order to avoid hydrogen induced cracking [15] .…”

Section: 4mentioning

confidence: 99%

LME susceptibility of galvanised welded structures of high strength steels

Vermeersch¹,

Waele²,

Caenegem³

2011

IJSMED

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“…[3,4] However, the conventional steel bars embedded in concrete are susceptible to erosion by free chloride ions in seawater and sea-sand. Although some remedial measures have been adopted to alleviate the problem of steel bar corrosion, [5][6][7][8][9] the results obtained are unsatisfactory. [10,11] Nevertheless, the development of fibrous composites with corrosion resistance has made significant progress so far, [12][13][14][15][16][17] wherein hybrid fiber-reinforced polymer (HFRP) bar possesses the outstanding advantages of tensile ductility, light weight, and high strength so that it is expected to be an alternative for the steel bar.…”

Section: Introductionmentioning

confidence: 99%

Study on durability of transverse shear properties for novel carbon/glass hybrid fiber‐reinforced polymer bars in simulated concrete environments

et al. 2023

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Durability on the transverse shear properties of hybrid fiber-reinforced polymer (HFRP) bar may control the cross-sectional load-bearing capacity and failure mode of the HFRP bar reinforced concrete members due to its strength degradation with time. Herein, the degradation of novel carbon/glass (C/G)-HFRP bars were accelerated in simulated concrete environments at 60 C to investigate the effects of fiber volume fraction and distribution pattern, matrix resin volume fraction, exposure environment, and period on their transverse shear properties. The results displayed that the transverse shear strength of the samples reduced by 15%, 20%, and 8% after exposure to the simulated ordinary concrete, seawater sea-sand concrete environments, and tap water for 6 months, respectively. The inward diffusion of water molecules and free hydroxyl ions caused the hydrolysis of matrix resin, etching of glass fiber and debonding of fiber/matrix interface, which were the incentives of the degradation of C/G-HFRP bars. The increase of matrix resin volume fraction and the application of a waterproof coating were recommended to alleviate the degradation of fibrous composites in concrete environments. Finally, two prediction models were proposed to determine the transverse shear strength of HFRP bar before and after exposure to different harsh environments, respectively. The comparisons indicated that the predicted values were coincided with the experimental results.

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“…The resulting problems are: 1. Fragilization due to the liquid metal, [4]; 2 Fragilization due to the hydrogen, [5]; 3 Fragilization due to the intermediary layer consisting of intermetallic Fe-Zn compounds, [6].…”

Section: Introductionmentioning

confidence: 99%

Structural Analysis for Joining Dissimilar Thin Sheets with CMT (Cold Metal Transfer) Process

Muncut

Perianu

Glăvan

et al. 2015

AMR

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The work includes work steps for joining thin sheets with a thickness ranging from1.0 mm (according to EN10327-2004). The study presents the following steps: problems arising from joining with CMT weld-brazing process of galvanized low-carbon steel sheets, used as filler material CuSi3. This is due to the fact that copper induces: grain refinement by lowering the transformation temperature and precipitation hardening after rapid cooling and tempering the theoretical and experimental study of these problems leads to the possibility of combining copper with iron. This is an experiment to investigate the formation of interlayer containing intermetallic compounds, inter layer located between the molten material and the base material. An important part of the study was the optimizing of weld-brazing parameters: welding current, welding speed and dynamic correction factor Ina.Keywords: galvanized sheets steel, joining, weld-brazing CMT, preserving the zinc layer, intermetallic layer.

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Problems with reliability and safety of hot dip galvanized steel structures

Cited by 10 publications

References 0 publications

LME susceptibility of galvanised welded structures of high strength steels

LME susceptibility of galvanised welded structures of high strength steels

Study on durability of transverse shear properties for novel carbon/glass hybrid fiber‐reinforced polymer bars in simulated concrete environments

Structural Analysis for Joining Dissimilar Thin Sheets with CMT (Cold Metal Transfer) Process

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