Effect of welding nugget diameter on the fatigue strength of the resistance spot welded joints of different steel sheets

Vural, M.; Akkuş, Ahmet; Eryürek, Barlas

doi:10.1016/j.jmatprotec.2006.02.026

Cited by 93 publications

(48 citation statements)

References 8 publications

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“…The endurance limit was 0.42 kN, 0.55 kN, and 0.6 kN for sets A, C, and E, respectively. Similar effects have been reported for steel [47,61] and aluminum [48], however, recent research reported that increasing the nugget size resulted in decreasing the fatigue strength of spot welds in AISI304 stainless steel [62].…”

Section: Cyclic Behaviorsupporting

confidence: 81%

Characterization of magnesium spot welds under tensile and cyclic loadings

2011

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Resistance spot welds of a magnesium alloy were characterized in terms of microstructure, hardness and monotonic and cyclic properties. Microstructural features in base metal and different zones in the weld region were discussed and the mechanical behavior of spot welds in tensile-shear configuration was studied. Effects of welding parameters were investigated on the micro-and macroscale characteristics of magnesium spot welds. To this end, five sets of spot weld specimens were prepared, utilizing different welding parameters. The effect of cyclic loading was studied on microstructure and hardness of the base metal and the weld region, and it was shown that microstructural features do not change remarkably under cyclic loading. Fatigue crack initiation and propagation behavior was discussed for different specimen sets under both low and high cyclic loads. Fatigue cracks under high cyclic loading initiated close to the nugget edge, and decreasing the cyclic load nucleated the cracks farther from the nugget.The final publication is available at Elsevier via http://dx.doi.org/10.1016/j.matdes.2011.06.001 © 2011 ABSTRACTResistance spot welds of a magnesium alloy were characterized in terms of microstructure, hardness and monotonic and cyclic properties. Microstructural features in base metal and different zones in the weld region were discussed and the mechanical behavior of spot welds in tensile-shear configuration was studied. Effects of welding parameters were investigated on the micro-and macro-scale characteristics of magnesium spot welds. To this end, five sets of spot weld specimens were prepared, utilizing different welding parameters. The effect of cyclic loading was studied on microstructure and hardness of the base metal and the weld region, and it was shown that microstructural features do not change remarkably under cyclic loading. Fatigue crack initiation and propagation behavior was discussed for different specimen sets under both low and high cyclic loads. Fatigue cracks under high cyclic loading initiated close to the nugget edge, and decreasing the cyclic load nucleated the cracks farther from the nugget.

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Section: Cyclic Behaviorsupporting

confidence: 81%

Characterization of magnesium spot welds under tensile and cyclic loadings

2011

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“…Karci et al [3] apresentam a variação do tamanho da lentilha de solda em função do tempo de aplicação da corrente, em chapas de aço de 2 mm de espessura, usando um eletrodo com diâmetro de face de 8 mm, mas não apresentam o valor da corrente utilizada. Vural et al [22] apresentam medidas do diâmetro da lentilha de solda, em chapas de 1,03 mm de espessura, em função da corrente aplicada durante um tempo referente a 15 períodos (freqüência de 50 Hz), mas não apresentam o valor do diâmetro da face do eletrodo utilizado. Marashi et al [23] apresentam a variação do diâmetro da lentilha de solda em função da corrente para um tempo equivalente a 12 ciclos (freqüência de 50 Hz), em chapas de 1,2 mm de espessura e com um eletrodo com diâmetro de face igual a 7 mm.…”

Section: Comparação Com Resultados Experimentaisunclassified

Simulação numérica do crescimento da lentilha de solda obtida pelo processo de soldagem a ponto por resistência elétrica no aço inox AISI 304

et al. 2010

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Resumo IntroduçãoO processo de soldagem a ponto por resistência elétrica, RSW (Resistance Spot Welding), é entre os processos de soldagem por resistência elétrica, o mais utilizado. Por ser adequado para união de chapas metálicas finas, tem grande emprego em diversas indústrias, notadamente na indústria automobilística onde possibilita grande produtividade, custo relativamente baixo e atende os requisitos de qualidade. Largamente utilizada para soldagem de aço carbono comum, sua aplicação na soldagem de outros materiais tem gerado o desenvolvimento de pesquisas para melhoria dos processos [1][2][3]. Num mercado extremamente competitivo, a procura por melhor qualidade e redução de custos é imperativa. No que se refere ao RSW isso exige um melhor conhecimento do mecanismo de formação da lentilha de solda e determinação da influência dos diversos parâmetros do processo de soldagem na sua geometria.No RSW interagem fenômenos mecânicos, elétricos, térmicos e metalúrgicos, em um intervalo de tempo muito pequeno. Por isso, sua análise experimental é complexa, exigindo grande dispêndio de recursos na tarefa de determinação da função dos diversos parâmetros que influenciam na qualidade do resultado, o ponto de solda. Uma alternativa que tem sido utilizada é a abordagem teórica com o uso do método de elementos finitos para resolução das equações resultantes do modelo matemático [4][5][6][7]. A análise por simulação numérica tem a grande vantagem

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“…Thus, RSW zones are quite critical in respect of fatigue damage (Kang et al, 2000). Stress intensity on the edge of a sharp crack is identified with stress intensity factor (Vural and Akkus, 2004;Vural et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

An experimental study on fracture toughness of resistance spot welded galvanized and ungalvanized DP 450 steel sheets used in automotive body

Sevim

2016

REVMETAL

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ABSTRACT:The purpose of this study is to determine fracture toughness of Resistance Spot Welded (RSW) Dual Phase (DP) steels. RSW of galvanized and ungalvanized DP 450 steel sheets was carried out on spot welding machine. Fracture toughness of RSW joints of galvanized and ungalvanized DP 450 steel sheets was calculated from tensile-shear tests. New empirical equations were developed using Least Squares Method (LSM) between energy release rate, fracture toughness and critical crack size depending on the relationship between hardness and fracture toughness values. Results indicated that fracture toughness of joints welded by using RSW increased exponentially while the hardness decreased. In addition, fracture toughness and energy release rate of RSW galvanized DP 450 steel sheets were lower compared to RSW ungalvanized DP 450 steel sheets which had approximately the same hardness. RESUMEN:Estudio experimental sobre la resistencia a la fractura de los aceros de resistencia soldada por puntos DP 450, láminas de acero galvanizado y sin galvanizar utilizados en la estructura del automóvil. El objetivo de este estudio es determinar la tenacidad de fractura de los aceros dual (DP) soldados por puntos de resistencia (RSW). En la máquina de soldadura por puntos se realizó la soldadura de láminas de acero DP 450 galvanizado y sin galvanizar. A partir de los ensayos de tracción-cizallamiento, se calculó la tenacidad a la fractura de las uniones del acero DP 450 galvanizado y sin galvanizar. Aplicando el método de mínimos cuadrados (LSM) se desarrollaron nuevas ecuaciones empíricas entre el porcentaje de energía liberada, la tenacidad de fractura y el tamaño de grieta crítica en función de la relación entre los valores de tenacidad de fractura y de dureza. Los resultados indicaron que la tenacidad de fractura de las uniones soldadas por RSW aumentó exponencialmente, mientras que la dureza disminuyó. Además, el porcentaje de energía liberada de las láminas de acero DP 450 galvanizadas y soldadas fueron menores que en el caso de las láminas sin galvanizar a valores iguales de dureza.PALABRAS CLAVE: Aceros dual (DP); Fatiga; Resistencia soldada por puntos (RSW); Tenacidad a la fractura

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Effect of welding nugget diameter on the fatigue strength of the resistance spot welded joints of different steel sheets

Cited by 93 publications

References 8 publications

Characterization of magnesium spot welds under tensile and cyclic loadings

Characterization of magnesium spot welds under tensile and cyclic loadings

Simulação numérica do crescimento da lentilha de solda obtida pelo processo de soldagem a ponto por resistência elétrica no aço inox AISI 304

An experimental study on fracture toughness of resistance spot welded galvanized and ungalvanized DP 450 steel sheets used in automotive body

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