Effect of Weld Metal Microstructures on Cold Crack Susceptibility of FCAW Weld Meta

Kim, Jae Hak; Seo, Jun Seok; Kim, Hee Jin; Ryoo, H. S.; Kim, Ka Hee; Huh, Moo Young

doi:10.3365/met.mat.2008.04.239

Cited by 14 publications

(6 citation statements)

References 1 publication

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“…wet welding) [7,8]. However, since the current tMCP steels are more resistant to HiC, the limitations in the welding process are mainly aimed at suppressing the formation of the soft zone in the HaZ [9]. this phenomenon is generally known as the softening effect and is observed for materials formed by unstable bainite and martensite phases.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Beam Welding Technologies Effect on the Properties of Welded Joints of S960MC Steel

Mičian,

Frátrik,

Bárta

2023

Archives of Metallurgy and Materials

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InvestIgatIon of Beam WeldIng technologIes effect on the ProPertIesof Welded JoInts of s960mc steel the work is focused on welding of fine-grained ultra-high-strength steel S960MC by laser beam welding and electron beam welding technologies. For a given type of steel, when the heat input is exceeded, the mechanical properties of welded joints will deteriorate. as a result, using beam welding technologies to limit the amount of heat input is recommended. Several butt welds were made, and mechanical tests and macroscopic analyses were performed to determine the impact of welding parameters on mechanical properties. Using beam welding technologies, the value of heat input was reduced by up to 73% compared to gas metal arc welding. When compared to a gas metal arc welded joint, the width of the soft zone was reduced by 69 to 79%. this resulted in a considerable reduction in the width of the soft zone, which was reflected in a 24% increase in yield strength and a 23% increase in tensile strength compared to gas metal arc welding.

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Section: Introductionmentioning

confidence: 99%

Investigation of Beam Welding Technologies Effect on the Properties of Welded Joints of S960MC Steel

Mičian,

Frátrik,

Bárta

2023

Archives of Metallurgy and Materials

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“…In particular, hydrogen-induced cracking (HIC) and softening may occur [8][9][10][11]. Modern TMCP steels are more resistant to HIC, and therefore the limitations in the welding process focus on suppressing the formation of the soft zone in the HAZ [12]. Despite the resistance to cracking, cracks in the weld metal could occur in cases where the cooling rate is too high.…”

Section: Introductionmentioning

confidence: 99%

Influence of Welding Parameters and Filler Material on the Mechanical Properties of HSLA Steel S960MC Welded Joints

Mičian

Frátrik

Kajánek

2021

Metals

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This article provides an overview of the influence of welding parameters and filler material on changes in the heat-affected zone (HAZ) of thermo-mechanically controlled processed (TMCP) steel welded joints. The research focused on evaluating the effect of heat input and cooling rate on the width of the soft zone, which significantly affects the mechanical properties of welded joints. The negative effect of the soft zone is more pronounced as the thickness of the material decreases. Therefore, the object of this research was a 3-mm-thick sheet of S960MC steel welded by gas metal arc welding (GMAW) and metal-cored arc welding (MCAW) technology. Variable welding parameters were reflected in different heat input and cooling rate values, which led to a change in the properties of the HAZ and thus the mechanical properties of the welded joints. The changes in the HAZ were analyzed by microscopic analysis and mechanical testing. The measured results showed a significant effect of heat input on the cooling rate, which considerably affected the width of the soft zone in the HAZ and thus the overall mechanical properties of the welded joints.

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“…Alloying elements for nucleating acicular ferrite, such as Ti, Al, and V, are required for proper austenite grain size. Kim and col. [5] proved influence of Ni content in weld metal on cold crack susceptibility. The 1.5 %Ni wire resulted in a weld microstructure with a lower grain boundary ferrite content associated with an increased proportion of acicular ferrite.…”

Section: Introductionmentioning

confidence: 99%

Influence of shielding gas flow rate on properties of steel S960QL welded joint

Ježek

Horváth

Kolařík

et al. 2020

METAL 2020 Conference Proeedings

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The experiment aimed on influence of shielding gas flow rate on properties of single V groove butt weld of high strength ultra-fine grained steel S960QL (XABO 960) and filler material G 89 6 M21 Mn4Ni2CrMo (X90) is described in this article. The steel S960QL is sensitive to presence of hydrogen in material structure, in exceed of maximal recommended content (<5ml/100g) the cold cracking may take place. During the experiment specimen 1 with reduced flow rate 5l.min-1 and specimen 2 with recommended flow rate 14l.min-1 was welded. The active shielding gas Corgon with the 82% Ar and 18% CO2 ratio was used. Flow rate of shielding gas has a noticeable influence on properties of welded joint. Because of specimen 1 reduced flow rate the full penetration was not achieved, chemical composition evaluation of weld metal shows fewer deoxidizing elements (Si, Mn, Ti) and increased hydrogen contents (≈18 ml/100g) as a result of chemical reaction between weld metal and air during welding. The increased hydrogen content, type of base metal and lack of penetration were the reasons of fracture of the specimen 1. Cold cracking was confirmed by hydrogen content measurement and by fracture surface evaluation by optical and electron microscopy. The porosity, fish eyes and cleavage facets typical for brittle fracture was found by microscopy. The high-quality weld with low content of hydrogen can be obtained with the recommended shielding gas flow rate, the flow rate adjustment is one of method how to avoid cold cracking of welds.

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Effect of Weld Metal Microstructures on Cold Crack Susceptibility of FCAW Weld Meta

Cited by 14 publications

References 1 publication

Investigation of Beam Welding Technologies Effect on the Properties of Welded Joints of S960MC Steel

Investigation of Beam Welding Technologies Effect on the Properties of Welded Joints of S960MC Steel

Influence of Welding Parameters and Filler Material on the Mechanical Properties of HSLA Steel S960MC Welded Joints

Influence of shielding gas flow rate on properties of steel S960QL welded joint

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