Study and Applications of Dynamic Resistance Profiles During Resistance Spot Welding of Coated Hot-Stamping Steels

Ighodaro, Osayande L.; Biro, E.; Zhou, Y.

doi:10.1007/s11661-016-3899-3

Cited by 25 publications

(15 citation statements)

References 19 publications

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“…Figure 12 shows the electrode displacement and the dynamic resistance at a welding current of 6.0 kA. It is shown that the nugget was formed in the time between 35 and 50 ms (dotted lines), according to [28,45]. In the process of the electrode displacement, the maximum displacement is reached at a welding time of about 120 ms (dotted line).…”

Section: Modelling a Variable Electrode Force Profilementioning

confidence: 99%

“…With the beginning of the nugget formation, a high energy input must be ensured, which supports rapid nugget growth. The nugget formation can be detected by the electrode displacement and the dynamic resistance signal [28,45]. The maximum electrode displacement is reached when the expansion rate slows down, and a turning point in the displacement signal is formed.…”

Section: Requirements Requirements Requirementsmentioning

confidence: 99%

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Resistance spot welding with variable electrode force—development and benefit of a force profile to extend the weldability of 22MnB5+AS150

2020

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Compared with conventional steels, press-hardened steels with an aluminium-silicon coating have a smaller welding range, which is resulting in reduced process stability. For this reason, an analytical methodology is required, which can optimise the welding parameters and extend the welding range significantly. Consequently, most publications focus on the variation of welding time and welding current at a constant electrode force. This paper deals with the design of a force profile to improve weldability and joint quality. The basis for this investigation is the identification of significant characteristic values by the recorded process signals.

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Section: Modelling a Variable Electrode Force Profilementioning

confidence: 99%

Section: Requirements Requirements Requirementsmentioning

confidence: 99%

Resistance spot welding with variable electrode force—development and benefit of a force profile to extend the weldability of 22MnB5+AS150

2020

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“…This behavior is caused by two fundamental reasons: rst, a high current results in a low resistance due to a constant lm breakdown voltage. Second, a higher current results in a higher heating rate, which softens and attens the asperities more quickly, causing the resistance to start dropping from relatively low values [13].…”

Section: Effect Of Welding Current On Nugget Growthmentioning

confidence: 99%

“…On their part, Ighodaro et al [13], used the dynamic resistance pro les to study RSW process of Al-Si-and galvannealed (GA)-coated steels. They reported that the dynamic resistance pro le for Al-Si-and GAcoated steel are similar.…”

Section: Introductionmentioning

confidence: 99%

Effect of Zinc Coating on Delay Nugget Formation in Dissimilar DP600 - AISI304 Welded Joints Obtained by the Resistance Spot Welding Process

Pérez

Hernández

Orozco

et al. 2021

Preprint

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This paper researches the effect of zinc coating of galvanized DP600 steel on the dynamic resistance and the delayed nugget formation of dissimilar DP600 - AISI304 welded joints, obtained with resistance spot welding process (RSW). The RSW evaluations consisted of determining, from the dynamic resistance curves, the time involved in the different stages of the process, particularly the beginning of nugget formation. The experimental results showed that, from the dynamic resistance curves, it is possible to identify 8 distinct stages during the welding of galvanized DP600 steel and AISI304 stainless steel. In the case of the welding of uncoated DP600 steel with AISI304, only 6 stages are identified (except for stages 2 and 3), which are directly related to the heating, softening and melting of the galvanic coating. The energy used in stages 2 and 3, causes a delay in the beginning of nugget formation for welded joints obtained with galvanized DP600 steel compared to uncoated DP600 - AISI304 welded joints, reaching values between 37.28 ms and 52.29 ms for the welding conditions analyzed. Monitoring the time duration of stages 2 and 3, as defined from the analysis of the dynamic resistance curves, could be used as a tool to predict the beginning of nugget formation in the welding of galvanized steels, to avoid undesirable phenomena such as expulsion and to guarantee the quality of the welded joints.

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“…To ensure the weld quality, many scholars and experts employed a lot of process signals and relative mathematical tools to establish the models for online monitoring and controlling the weld quality. In general, dynamic resistance and electrode signal are two the most commonly used process variables, not only to online evaluate the weld quality [5,[10][11][12][13], but also to comprehensively analyze and understand the welding process [14][15][16][17]. Also, various sensors may be employed together to achieve the goal [18,19].…”

Section: Introductionmentioning

confidence: 99%

Online measuring the electrical resistivity of molten nugget of stainless steel in resistance spot welding

Zhou

Shi

Cai

2017

Journal of Manufacturing Processes

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The variation characteristics of electrical resistivity of the parent metal can improve in-depth understanding of the resistance spot welding (RSW) process. According to the characteristic of RSW process and the physical principle of electrical resistivity, a comprehensive mathematical description of the electrical resistivity measurement of the molten nugget can be obtained. Then a series of corresponding experiments, including the RSW operation to obtain the dynamic resistance, online temperature measurement to obtain the electrical resistivity of solid metals and metallurgical analyses to obtain the size of the molten nugget, were sequentially conducted. The results of the electrical resistivity of the molten nugget can be obtained according to relative measurements, calculations and analyses. The work can benefit the establishment of accurate mathematical model for RSW process, and then serve the welding automation, corresponding researches and actual production process.

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Study and Applications of Dynamic Resistance Profiles During Resistance Spot Welding of Coated Hot-Stamping Steels

Cited by 25 publications

References 19 publications

Resistance spot welding with variable electrode force—development and benefit of a force profile to extend the weldability of 22MnB5+AS150

Resistance spot welding with variable electrode force—development and benefit of a force profile to extend the weldability of 22MnB5+AS150

Effect of Zinc Coating on Delay Nugget Formation in Dissimilar DP600 - AISI304 Welded Joints Obtained by the Resistance Spot Welding Process

Online measuring the electrical resistivity of molten nugget of stainless steel in resistance spot welding

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