Influence of procedures and transfer modes in MAG welding in the reduction of deformations on marine structure panels

Cabral, Tárcio dos Santos; Braga, Eduardo de Magalhães; Mendonça, Everton Augusto Maciel; Scott, Américo

doi:10.1080/09507116.2014.932993

Cited by 16 publications

(18 citation statements)

References 6 publications

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“…This process is a technical and economical alternative to double wire GMAW welding [9,10] and proposes to increase deposition rate, reduce dilution, increase welding speed, among other benefits. Other processes have been developed using a similar variation, such as DE-GMAW [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Influence of a cobalt-based wire injection in austenitic coating deposited via CW-GMAW

Cabral

Dias

Filho

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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The control of cavitation erosion wear is a hindrance concerning the maintenance of hydraulic equipment's. The most used consumables to fill eroded areas are cobalt-based austenitic steels, commercially known as ''Stellites''. The current study carried out analysis of the coatings deposited via the new cold wire gas metal arc welding (CW-GMAW) process. The coatings were deposited via CW-GMAW process, variating three levels of addition wire feeding speed. The coating consisted in a three-layer deposit; the first two with an AWS ER 309L wire, via GMAW process, and the third layer employed the interaction between AWS ER 309L and Stellite 21 E wires, via CW-GMAW process. The coatings obtained an increase in cobalt values, with silicon and molybdenum variations, as well as the iron value reduction for each used feeding variation. The coatings were subjected to an accelerated erosion test, according to ASTM G32 Standards. The best obtained result corresponded to the coating with 7.2 m/min additional speed.

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Section: Introductionmentioning

confidence: 99%

“…In the CW-GMAW process, the addition wire fuses with the energized wire, using the electric arc heat and/or thermal energy of the weld pool, promoting the coalescence of the used consumables [9,10]. An important advantage of the CW-GMAW process is the use of wires with different chemical compositions.…”

Section: Introductionmentioning

confidence: 99%

Influence of a cobalt-based wire injection in austenitic coating deposited via CW-GMAW

Cabral

Dias

Filho

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

Self Cite

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“…The fatigue life of the specimens was accessed using the Weibull distribution, which has a two-parameter probability density function (PDF) as shown in equation (1). [15][16][17] f…”

Section: Weibull Statistical Analysismentioning

confidence: 99%

“…In addition to the improved productivity resulting from increased melting efficiency, the CW-GMAW process also offers a decrease in the heat input to the base metal, hence lowering distortion and residual stress level. 1 The overall heat input is reduced, despite that there is a small increase in the welding current using CW-GMAW, when using a constant voltage power source. Ribeiro et al 2 performed a regression and sensitivity analysis, when evaluating the influence of the process parameters on the final geometry of the weld bead, and showed that penetration and dilution have a negative sensitivity to variations in welding current, suggesting that the non-energised wire acts as a heat sink decreasing the melting rate of the energised electrode and, therefore, shortens the arc length, hence the power source has to increase the welding current to maintain the same arc voltage.…”

Section: Introductionmentioning

confidence: 99%

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

Marques

Santos

Gerlich

et al. 2017

Science and Technology of Welding and Joining

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The fatigue strength of weld joints manufactured using gas metal arc welding and cold wire GMAW (CW-GMAW) was evaluated under stress-controlled cyclic loading. The material used in this study was class ASTM 131 grade A steel, joined using ER70S wire filler metal. The addition of cold wire led to a decrease in the amount of intergranular ferrite and an increase in hardness in the heataffected zone. The assessment of fatigue life was performed by using the Weibull distribution and the results revealed that with a 99% reliability the joints produced using the CW-GMAW process have a longer fatigue life, especially as the stress amplitude increases.

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“…Ultimately, the two processes differ by range of admissible parameters, since the cold wire can stabilize metal transfer [6]. Moreover, this difference in dilution can be linked to the thermal signature, as reported in [7], showing that cold wire welds result in lower heat-induced distortion compared to standard GMAW welds.…”

Section: Introductionmentioning

confidence: 99%

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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Influence of procedures and transfer modes in MAG welding in the reduction of deformations on marine structure panels

Cited by 16 publications

References 6 publications

Influence of a cobalt-based wire injection in austenitic coating deposited via CW-GMAW

Influence of a cobalt-based wire injection in austenitic coating deposited via CW-GMAW

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

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

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