Share of Spot Welding and Other Joining Methods in Automotive Production

Janota, Miroslav; Neumann, H.

doi:10.1007/bf03266625

Cited by 8 publications

(4 citation statements)

References 1 publication

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“…Resistance spot welding (RSW) is by far the most widely used joining method in the automotive industry due to the high operating speeds, low costs, the reliability of the process and the suitability for automation [2][3][4]. However, the thermal-mechanical cycle during resistance spot welding destroys the carefully designed multi-phase microstructure.…”

Section: Introductionmentioning

confidence: 99%

The microstructural evolution and elemental distribution of a 3rd generation 1 GPa advanced high strength steel during double pulse resistance spot welding

Eftekharimilani

Hermans

et al. 2017

Weld World

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This paper presents the effects of double pulse resistance spot welding (RSW) on the microstructural evolution, elemental distribution and mechanical properties of a 3 rd generation 1 GPa advanced high strength steel (AHSS). In order to investigate the effect of double pulsing, the steel was exposed to single and various double pulse RSW schedules. The first current pulse was applied to create the weld nugget, while the second current pulse generated a secondary weld nugget and annealed or (partial) re-melted the primary weld nugget, depending on the magnitude of the current. The effect of the second current pulse on the weld nugget and heat-affected zone characteristics was investigated using optical microscopy and electron probe microanalysis (EPMA). Optical and electron microscopy revealed that the secondary weld nugget is fully martensitic, showing a typical solidification microstructure, while the annealed zone reveals an equi-axed martensitic structure. EPMA results showed that elemental segregation has been considerably reduced in the annealed zone. Mechanical properties of the welds show that the AHSS studied is prone to weld metal failure for single pulse RSW. However, the double pulse RSW method can lead to significantly improved mechanical performance and favourable failure modes.

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Section: Introductionmentioning

confidence: 99%

The microstructural evolution and elemental distribution of a 3rd generation 1 GPa advanced high strength steel during double pulse resistance spot welding

Eftekharimilani

Hermans

et al. 2017

Weld World

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“…Resistance spot welding (RSW) remains the most widely-used joining method in the automotive industry [1]. However, laser spot welding (LSW) provides a flexible alternative to RSW with the benefits of low distortion due to concentrated heat source, and requires only line-of-sight (with one side of the area to be welded) fabrication, allowing for access to more difficult-to-reach areas.…”

Section: Introductionmentioning

confidence: 99%

Residual stress analysis of laser spot welding of steel sheets

et al. 2009

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a b s t r a c tExperimental and numerical studies were conducted to characterize laser and resistance spot welds to gain an understanding of load carrying capacity, temperature distributions and residual stress states of different joint geometries used in the automotive industry. Different laser spot weld path geometries are compared with conventional resistance spot welds to find the residual stress distributions in each. It was found out that the weld region in laser spot welding is surrounded by a compressive region which has higher compressive stress values and larger size than that of resistance spot welds. Simulations showed good agreement with experimental temperature distributions, and were able to qualitatively predict the residual stress distributions in each of the weld geometries. The thermal history at known failure locations within the welds and the influence of the weld geometries on cooling rate are also discussed.

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“…It has been demonstrated that in non-load carrying joints such softening might result in the joint area being the weakest component of a structure [1]. GMAB (or MIG brazing) is a well-known process in industries where thin-walled structures are constructed using galvanized steel plates [2][3][4][5]. By using GMAB instead of conventional fusion welding, the beneficial effect of the galvanized layer, e.g.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Performance of GMA-Brazed Non-load Carrying Joints Made of Ultra-High-Strength Steel

Ahola

Skriko

Björk

2018

Lecture Notes in Mechanical Engineering

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With the aim of maximizing energy efficiency, the use of low-alloyed ultra-high strength steels (UHSS) has greatly increased in vehicles and other transport applications in recent decades. Using UHSS, equivalent ultimate load capacity can be achieved with less material than when using conventional structural steels. Along with increased static load, structures commonly made of UHSS are often subjected to high cyclic load, and good fatigue strength is thus demanded. In this study, the fatigue strength was obtained for gas metal arc (GMA)-brazed non-load carrying joints made of S960 MC plates. CuMn13Al7 and CuAl8 were used as braze alloys. In addition, the work evaluated the potential of gas metal arc brazing (GMAB) as a post-weld improvement technique. A total of 21 different test specimens were manufactured and tested with constant amplitude fatigue tests with an applied stress ratio of R = 0.1. Notch effects of the braze joints were investigated numerically using finite element analysis (FEA). Depending on the braze alloy and joint configuration, mean nominal fatigue strengths of FATmean = 134-192 MPa were obtained, indicating that GMAB is a promising joining method for structures made of UHSS. The FEA results showed that for the studied materials and joints, stress concentration induced in the joint can decrease approximately by 20% when GMAB is applied instead of fusion welding.

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Share of Spot Welding and Other Joining Methods in Automotive Production

Cited by 8 publications

References 1 publication

The microstructural evolution and elemental distribution of a 3rd generation 1 GPa advanced high strength steel during double pulse resistance spot welding

The microstructural evolution and elemental distribution of a 3rd generation 1 GPa advanced high strength steel during double pulse resistance spot welding

Residual stress analysis of laser spot welding of steel sheets

Fatigue Performance of GMA-Brazed Non-load Carrying Joints Made of Ultra-High-Strength Steel

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