Resistance spot welding and weldbonding of advanced high strength steels

Weber, Gert; Thommes, H.; Gaul, H.; Hahn, Ortwin; Rethmeier, Michael

doi:10.1002/mawe.201000687

“…It also improves the corrosion, noise resistance and joint stiffness [67]. Some studies related to microstructures and mechanical properties of WB joints have been reported [31,32,68,69]. Chang et al [31] studied a computational model and the stress field characteristics of WB joints for a car body steel sheet and observed a serious stress concentration existing at the edge of the weld spot in the spotwelded joints, and it could be removed or reduced by the application of adhesives.…”

Section: Weld-bonding Processmentioning

confidence: 99%

Microstructure and Mechanical Properties of Welded Advanced Materials for Automotive Applications

Xu¹

2023

Preprint

0

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Growing use of advanced materials (advanced high strength steel DP980 and ultralight-weight magnesium alloys) and innovative joining techniques (new-generation laser welding technology and weld bonding technique) is crucial for better fuel economy and lower CO2 emissions in automotive manufacturing. Microstructures and mechanical properties of fiber laser welded high strength low alloy and DP980 steel joints, weld-bonded Mg/Mg and Mg/steel joints and adhesive-bonded Mg/Mg joints were studied. Tempered martensite and welding concavity were observed in fiber laser welded DP980 joints which reduced fatigue resistance, while both HSLA and DP980 joints showed a superior tensile strength. Weld-bonded Mg/Mg and Mg/steel joints with an adhesive layer were significantly stronger than resistance spot welded Mg/steel joints. Reducing bonding length on weld bonded Mg/Mg joints led to a higher maximum tensile shear stress, both tensile and fatigue strength were slight lower than that of adhesive bonded Mg/Mg joints, while ability of energy absorption was equivalent. The tensile properties reduced at a higher temperature (90°C) but it increased at a lower temperature (-40°C).

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“…It also improves the corrosion, noise resistance and joint stiffness [67]. Some studies related to microstructures and mechanical properties of WB joints have been reported [31,32,68,69]. Chang et al [31] studied a computational model and the stress field characteristics of WB joints for a car body steel sheet and observed a serious stress concentration existing at the edge of the weld spot in the spotwelded joints, and it could be removed or reduced by the application of adhesives.…”

Section: Weld-bonding Processmentioning

confidence: 99%

Microstructure and Mechanical Properties of Welded Advanced Materials for Automotive Applications

Xu¹

2023

Preprint

0

View full text Add to dashboard Cite

Growing use of advanced materials (advanced high strength steel DP980 and ultralight-weight magnesium alloys) and innovative joining techniques (new-generation laser welding technology and weld bonding technique) is crucial for better fuel economy and lower CO2 emissions in automotive manufacturing. Microstructures and mechanical properties of fiber laser welded high strength low alloy and DP980 steel joints, weld-bonded Mg/Mg and Mg/steel joints and adhesive-bonded Mg/Mg joints were studied. Tempered martensite and welding concavity were observed in fiber laser welded DP980 joints which reduced fatigue resistance, while both HSLA and DP980 joints showed a superior tensile strength. Weld-bonded Mg/Mg and Mg/steel joints with an adhesive layer were significantly stronger than resistance spot welded Mg/steel joints. Reducing bonding length on weld bonded Mg/Mg joints led to a higher maximum tensile shear stress, both tensile and fatigue strength were slight lower than that of adhesive bonded Mg/Mg joints, while ability of energy absorption was equivalent. The tensile properties reduced at a higher temperature (90°C) but it increased at a lower temperature (-40°C).

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“…Thermally, the RSW process can be described by the general electro-kinetic equation, as stated in (1), which adds a Joule heating term to the commonly used general heat equation.…”

Section: Thermo-electrical Modelmentioning

confidence: 99%

“…An efficient solution to meet such demands is the introduction of high strength (HSS) and ultra high strength (UHSS, sometimes also referred to as advanced high strength steels, AHSS) in body-in-white components. While higher strength materials effectively enables reduction of car weight, the material behavior of HSS and UHSS, due to their metallurgy and alloying elements, also imposes challenges for joining in manufacturing [1].…”

Section: Introductionmentioning

confidence: 99%

Prediction and Verification of Resistance Spot Welding Results of Ultra-High Strength Steels through FE Simulations

Andersson

¹

,

Melander²

2015

MNSMS

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Resistance spot welding (RSW) is the most common welding method in automotive engineering due to its low cost and high ability of automation. However, physical weldability testing is costly, time consuming and dependent of supplies of material and equipment. Finite Element (FE) simulations have been utilized to understand, verify and optimize manufacturing processes more efficiently. The present work aims to verify the capability of FE models for the RSW process by comparing simulation results to physical experiments for materials used in automotive production, with yield strengths from approximately 280 MPa to more than 1500 MPa. Previous research has mainly focused on lower strength materials. The physical weld results were assessed using destructive testing and an analysis of expulsion limits was also carried out. Extensive new determination of material data was carried out. The material data analysis was based on physical testing of material specimens, material simulation and comparison to data from literature. The study showed good agreement between simulations and physical testing. The mean absolute error of weld nugget size was 0.68 mm and the mean absolute error of expulsion limit was 1.10 kA.

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Resistance spot welding and weldbonding of advanced high strength steels

Cited by 13 publications

References 4 publications

Microstructure and Mechanical Properties of Welded Advanced Materials for Automotive Applications

Microstructure and Mechanical Properties of Welded Advanced Materials for Automotive Applications

Microstructure and Mechanical Properties of Welded Advanced Materials for Automotive Applications

Prediction and Verification of Resistance Spot Welding Results of Ultra-High Strength Steels through FE Simulations

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