Effects of welding wire and torch weaving on GMAW of S355MC and AISI 304L dissimilar welds

Tasalloti, H.; Kah, Paul; Martikainen, Jukka

doi:10.1007/s00170-013-5484-x

Cited by 30 publications

(26 citation statements)

References 13 publications

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“…The change in torch weaving (sinusoidal, linear and circular), welding speed, power and arc length influenced the welding metallurgy as well as the dissipation and accumulation of heat and solidification (cooling) within welded joint, affecting the microstructural zones which showed hard phases resulting in Vickers hardening [4], an increase in HAZ width, an increase in yielding strength, reduction of impact energy and degradation of quality. However, the triangular torch weaving favored the best metallurgical quality of the butt welded joint.…”

Section: Resultsmentioning

confidence: 99%

“…The quality of a welded joint is a function of the lowest mean HAZ width, a bezel root with no weld excess, uniformity in the weld face, minimum reinforcement of the weld bead and the absence of defects such as porosity [4], lack of fusion and incomplete penetration. For welding condition A (201 A, 27 V, W s =38.5 cm/min) we observed that quality of the welded joint was lowest in the circular weld, followed by the sinusoidal and linear in comparison with the triangular weave.…”

Section: Macrostructural Analysismentioning

confidence: 99%

“…Therefore, condition B is not recommended for welding [4]. HAZ width and microstructural characteristics observed for the four torch weaving types could influence the behavior of Vickers hardness, tensile strength and impact energy as described in the following sections.…”

Section: Microstructural Evolutionmentioning

confidence: 99%

“…There has been some work on robotic welding focused on welding metallurgy, functionality and technical capabilities of adequate performance techniques [2,4,5]. This research is related to Chen et.…”

Section: Introductionmentioning

confidence: 99%

“…Formation of a narrow martensitic band around the fusion line on the ferritic side of the welded joint was detected on the majority of samples obtained using weaving, resulting in hardening favored by quick solidification. Torch weaving lowered penetration on the structural steel side due to rapid heat dissipation and higher heat conductivity [4]. Another study reported the effect of three significant variables, namely welding current, arc voltage and welding speed over the penetration of 6842 steel welded using a GMAW robotic process.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Torch Weaving on the Microstructure, Tensile and Impact Resistances, and Fracture of the HAZ and Weld Bead by Robotic GMAW Process on ASTM A36 Steel

et al. 2017

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Abstract:The effect of torch weaving on the microstructure, tensile strength, impact resistance and fracturing in robotic welded joints using varing welding speeds, voltages and currents was evaluated through fractography using scanning electron microscopy, tension, impact and micro-hardness tests and optic microscopy. Results indicated that linear, sinusoidal and circular weavings favored an increase of the width of the HAZ as well as a slight increase in yield resistance accompanied by hardening in comparison with a triangular weave. The latter favored larger impact energy in the HAZ with less width, containing coarse-grained ferrite due to lower tensile strength and Vickers hardness. A circular weave generated the highest level of hardening and the lowest energy absorbed in the HAZ as a consequence of an increase in yield strength related to the fine needles of acicular ferrite. A linear weave favored the greatest width of the HAZ compared with other weld weavings due to heat accumulation along the fusion line of the welded joint. Hardening and loss of toughness were evaluated through fractographic analysis showing mixed fractures mainly composed of brittle fracturing made by transgranular cleavages with facets containing well defined river patterns.Key-words: HAZ; Cleavage fracture; Robotic welding; Torch weaving; ASTM A36 steel. Efeito do Movimento da Tocha na Microestrutura, Resistência à Tração e ao Impacto, e Fratura da ZAC e Cordão de Solda por Processo GMAW Robotizado em Aço ASTM A36Resumo: O efeito do movimento da tocha sobre a microestrutura, resistência à tração e impacto e fratura em juntas soldadas por processo robotizado, variando velocidade, voltagem e corrente de soldagem foi avaliado através de fratografia, usando microscopia eletrônica de varredura, provas de tração e impacto e testes de microdureza e microscopia óptica. Os resultados indicaram que os movimentos lineares, senoidais e circulares favorecem um aumento da largura da ZAC, assim como, um ligeiro aumento do limite elástico acompanhado de endurecimento em comparação com o movimento triangular. A energia de impacto é mais favorecida na ZAC com menor largura, contendo grãos grosseiros de ferrita devido à menor resistência à tração e dureza Vickers. Um movimento circular produziu o nível mais elevado de endurecimento e a menor energia absorvida na ZAC como consequência de um aumento na limite elástico relacionado com as agulhas finas de ferrita acicular. Um movimento linear favoreceu maior largura da ZAC em comparação com outros movimentos da tocha, devido à acumulação de calor ao longo da linha de fusão da junta soldada. Endurecimento e perda de tenacidade foram avaliados através de análise fratográfica mostrando fraturas mistas compostas principalmente de fratura frágil por clivagem transgranular com facetas contendo marcas de rio bem definidas.Palavras-chave: ZAC; Fratura por clivagem; Soldagem robotizada; Movimento de tocha; Aço ASTM A36.

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Section: Resultsmentioning

confidence: 99%

Section: Macrostructural Analysismentioning

confidence: 99%

Section: Microstructural Evolutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Torch Weaving on the Microstructure, Tensile and Impact Resistances, and Fracture of the HAZ and Weld Bead by Robotic GMAW Process on ASTM A36 Steel

et al. 2017

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On the effect of Qnet on compressive residual stresses and ductile toughness of dissimilar HAZ in robotic GMAW joints between A572-50 and A36 steels

Arista

Guzman

Gonzalez

et al. 2021

Int J Adv Manuf Technol

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Study of cracking susceptibility in similar and dissimilar welds between carbon steel and austenitic stainless steel through finger test and FE numerical model

Alcantar-Modragón

García-García

Reyes-Calderón

et al. 2021

Int J Adv Manuf Technol

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Hot cracking susceptibility and the formation of brittle martensite phase are the main factors that limit the weldability of a dissimilar joint between carbon steel (CS) and austenitic stainless steel (SS). In this study, the self-constraint finger test was used to correlate the welding thermo-mechanical field with the crack susceptibility of a dissimilar weld between the CS ASTM A36 and SS AISI 304L. The finger test allowed to intercalate fingers (portions) of tested materials in the weld samples to produce dissimilar welds. The heat dissipation and the distortion behavior were related to the crack susceptibility, critical weld regions extension and chemical species diffusion. Four samples were welded (two similar welds and two dissimilar welds) using the filler metals ER70S-6 and EC410NiMo. Welds were analyzed through light optical microscopy (LOM) and scanning electron microscopy (SEM) to characterize phases, detect cracks, microstructural changes and element diffusion. A finite element (FE) numerical model was applied to simulate the welding thermo-mechanical field.Additionally, electrochemical tests were carried out to assess the corrosion susceptibility of the dissimilar welds. The observed cracks were produced due to different factors such as residual stress distribution, the formation of brittle and untempered martensitic phase in the fusion zone (FZ) and hot cracking associated with the weld sample distortion behavior. The dilution contributed to the formation of -ferrite in the FZ, which limited the growth of cold and hot cracks. The decarburization and sensitization were not observed in dissimilar welds due to the low element diffusion.

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Effects of welding wire and torch weaving on GMAW of S355MC and AISI 304L dissimilar welds

Cited by 30 publications

References 13 publications

Effect of Torch Weaving on the Microstructure, Tensile and Impact Resistances, and Fracture of the HAZ and Weld Bead by Robotic GMAW Process on ASTM A36 Steel

Effect of Torch Weaving on the Microstructure, Tensile and Impact Resistances, and Fracture of the HAZ and Weld Bead by Robotic GMAW Process on ASTM A36 Steel

On the effect of Qnet on compressive residual stresses and ductile toughness of dissimilar HAZ in robotic GMAW joints between A572-50 and A36 steels

Study of cracking susceptibility in similar and dissimilar welds between carbon steel and austenitic stainless steel through finger test and FE numerical model

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