Fatigue life assessment of weld joints manufactured by GMAW and CW-GMAW processes

Marques, Luiz Fernando Nazaré; Santos, E. B. F.; Gerlich, A.P.; Braga, Eduardo de Magalhães

doi:10.1080/13621718.2016.1194735

Cited by 19 publications

(13 citation statements)

References 28 publications

(61 reference statements)

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“…Subsequent research [10] studied the effect of the CW-GMAW on process-induced residual stresses, concluding that welds manufactured by CW-GMAW have lower levels of residual stresses. This decrease in residual stresses might explain the improvement in fatigue life reported in [11].…”

Section: Introductionmentioning

confidence: 69%

Application of Cold Wire Gas Metal Arc Welding for Narrow Gap Welding (NGW) of High Strength Low Alloy Steel

et al. 2019

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Narrow gap welding is a prevalent technique used to decrease the volume of molten metal and heat required to fill a joint. Consequently, deleterious effects such as distortion and residual stresses may be reduced. One of the fields where narrow groove welding is most employed is pipeline welding where misalignment, productivity and mechanical properties are critical to a successful final assemblage of pipes. This work reports the feasibility of joining pipe sections with 4 mm-wide narrow gaps machined from API X80 linepipe using cold wire gas metal arc welding. Joints were manufactured using the standard gas metal arc welding and the cold wire gas metal arc welding processes, where high speed imaging, and voltage and current monitoring were used to study the arc dynamic features. Standard metallographic procedures were used to study sidewall penetration, and the evolution of the heat affected zone during welding. It was found that cold wire injection stabilizes the arc wandering, decreasing sidewall penetration while almost doubling deposition. However, this also decreases penetration, and incomplete penetration was found in the cold wire specimens as a drawback. However, adjusting the groove geometry or changing the welding parameters would resolve this penetration issue.

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Section: Introductionmentioning

confidence: 69%

Application of Cold Wire Gas Metal Arc Welding for Narrow Gap Welding (NGW) of High Strength Low Alloy Steel

et al. 2019

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“…Ribeiro et al [13] carried out a predicting weld bead geometry study for the CW-GMAW process, where the deposition rate increases by cold wire addition. CGHAZ reduction was also expected due to a lower heat input and faster cooling rate associated with cold wire increment [12]. Further, deposition rate values in the experimental parameters are 100% higher than the industry.…”

Section: Geometric and Cghaz Analysismentioning

confidence: 82%

“…However, the high temperatures of the weld process incorporated residual stresses with a decrease in their ballistic performance. Marques et al [12] observed a ferrite reduction in the CGHAZ, confirming a modification in the microstructure by the addition of cold wire and the faster cooling rate due to less heat input associated with the CW process. In addition, an increase in the microhardness is associated with this rate increment, observed in Fig.…”

Section: Geometric and Cghaz Analysismentioning

confidence: 88%

“…The cold wire gas metal arc welding (CW-GMAW) is the one of the simplest modifications of GMAW process with great advantages such as higher deposition rate without adding more heat input to the base metal, thereby lowering distortions [10] and residual stresses [11]. Besides, Marques et al [12] carried out a study over fatigue using a CW-GMAW process showing that the joints have a longer fatigue life, with a higher reliability level than the one performed by conventional GMAW process; moreover, there are is a decrease in the angular misalignment, which can be attributed to a lower heat input into the base metal. This effect can cause microstructural changes in the HAZ.…”

Section: Introductionmentioning

confidence: 99%

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High-hardness armor welded by CW-GMAW: economic, geometric and CGHAZ analysis

Vasconcelos

Loayza

Assunção

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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High-hardness steel is widely used in the armor industry due to their mechanical properties that combines hardness and toughness, which generates a great resistance to the impact of projectiles. Almost all applications in the armor industry include the welding of its components; however, several modifications could happen in the microstructure. For instance, one main region involved in the welding performance is the coarse-grained heat-affected zone (CGHAZ), especially in high-hardness steel, due to the formation of highly brittle, non-tempered martensitic. Furthermore, studies concerning the influence of the variations in welding parameters and the addition of cold wire have not been conducted so far. In this paper, we determined the influences of the welding parameters on the economical, geometric and coarse-grained heat-affected zone of the weld beads. In addition, the influences of the cold wire are also shown. To perform the experimental procedure, two parameters were tested: the industrial parameters, used for the conventional steel welding, and the experimental parameters, obtained in this study. The welding velocity and dilution were 150% and 53% higher, respectively. Besides, the deposition rate was 100% greater for the improved parameters with a 50% reduction in the CGHAZ area.

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“…Therefore, it is not possible to guarantee a high quality weld with regard to a sufficient corrosion resistance as well as high strength of the welded joint. In addition, the mechanical properties are influenced by the high cooling rates [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Development of a highly productive GMAW hot wire process using a two-dimensional arc deflection

et al. 2020

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Gas metal arc welding (GMAW) processes are used in a wide range of applications due to their high productivity and flexibility. Nevertheless, the supplied melting wire electrode leads to a coupling of material and heat input. Therefore, an increase of the melting rate correlates with an increase of the heat input by the arc at the same time. A possibility to separate material and heat input is to use an additional wire, which reduces penetration and worsens the wetting behaviour. Consequently, bead irregularities such as bonding defects or insufficient root weldings can occur. In the context of this article, a controlling system for a two-dimensional magnetic arc deflection is presented, which allows to influence arc position as well as material transfer. The analysed GMAW hot wire process is characterised by high melting rates while also realising a sufficient penetration depth and wetting behaviour.Keywords Gas metal arc welding . Hotwire . Two-dimensional magnetic arc deflection . High productive welding

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Fatigue life assessment of weld joints manufactured by GMAW and CW-GMAW processes

Cited by 19 publications

References 28 publications

Application of Cold Wire Gas Metal Arc Welding for Narrow Gap Welding (NGW) of High Strength Low Alloy Steel

Application of Cold Wire Gas Metal Arc Welding for Narrow Gap Welding (NGW) of High Strength Low Alloy Steel

High-hardness armor welded by CW-GMAW: economic, geometric and CGHAZ analysis

Development of a highly productive GMAW hot wire process using a two-dimensional arc deflection

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