Quantifying residual stresses in resistance spot welding of 6061-T6 aluminum alloy sheets via neutron diffraction measurements

Florea, R.S.; Hubbard, Camden R.; Solanki, Kiran; Bammann, Douglas J.; Whittington, W.R.; Marin, Esteban

doi:10.1016/j.jmatprotec.2012.06.024

Cited by 29 publications

(10 citation statements)

References 15 publications

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“…A common assumption for thin welded plates, as is the case for the work-pieces investigated in this paper, is a state of plane stress. [19][20][21][22] Using this plane-stress assumption, a d 0 (or sin h 0 ) value is applied at each measurement location to force the normal stress to zero. The in-plane stresses, calculated with the same d 0 value, are thus corrected.…”

Section: B Determination Of Strain-free Reference Parametermentioning

confidence: 99%

Effect of Weld Schedule on the Residual Stress Distribution of Boron Steel Spot Welds

Raath

Norman

McGregor

et al. 2017

Metall Mater Trans A

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2017) Effect of weld schedule on the residual stress distribution of boron steel spot welds. Metallurgical and Materials Transactions A, 48 (6). pp. 2900-2914. Permanent WRAP URL:Press-hardened boron steel has been utilized in anti-intrusion systems in automobiles, providing high strength and weight-saving potential through gage reduction. Boron steel spot welds exhibit a soft heat-affected zone which is surrounded by a hard nugget and outlying base material. This soft zone reduces the strength of the weld and makes it susceptible to failure. Additionally, different welding regimes lead to significantly different hardness distributions, making failure prediction difficult. Boron steel sheets, welded with fixed and adaptive schedules, were characterized. These are the first experimentally determined residual stress distributions for boron steel resistance spot welds which have been reported. Residual strains were measured using neutron diffraction, and the hardness distributions were measured on the same welds. Additionally, similar measurements were performed on spot welded DP600 steel as a reference material. A correspondence between residual stress and hardness profiles was observed for all welds. A significant difference in material properties was observed between the fixed schedule and adaptively welded boron steel samples, which could potentially lead to a difference in failure loads between the two boron steel welds.

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Section: B Determination Of Strain-free Reference Parametermentioning

confidence: 99%

Effect of Weld Schedule on the Residual Stress Distribution of Boron Steel Spot Welds

Raath

Norman

McGregor

et al. 2017

Metall Mater Trans A

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“…A Yokogawa scope-corder DL750 and Miyachi weld monitor recorded and monitored the welding process. Traces to capture welding current, electrode position, and force were utilized via ARONET 2006 software [17]. The power supply was a direct current (DC) type.…”

Section: Equipment and Experimentsmentioning

confidence: 99%

Welding parameters influence on fatigue life and microstructure in resistance spot welding of 6061-T6 aluminum alloy

et al. 2013

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“…Accurate and precise measurement of the magnitude, orientation and distribution of residual stresses is of importance to evaluate the durability of welded components. Various studies have been carried out to simulate and measure the state of residual stress in spot-welded joints [6][7][8][9][10]. Lawrence et al [11] showed that fatigue strength of spot weld improves either by reducing tensile residual stress or inducing compressive residual stress.…”

Section: Introductionmentioning

confidence: 99%

Effect of pulse scheme on the microstructural evolution, residual stress state and mechanical performance of resistance spot welded DP1000-GI steel

Chabok

Basu

et al. 2018

Science and Technology of Welding and Joining

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In the present study, the effect of resistance spot welding scheme (i.e. single and double pulse welding) on the mechanical behaviour of resistance spot-welded DP1000-GI steel is investigated. It is shown that double pulse welding at low welding current decreases the maximum crosstension strength and mechanical energy absorption capability of the welds. The factors that lead to the lower mechanical performance of double pulse welds are scrutinised. Local residual stress mapping reveals that the compressive residual stress perpendicular to the plane of the pre-crack either decreases or is fully released at the weld edge of double pulse welds. Orientation imaging microscopy analyses show that the martensite formed in front of the pre-crack of double pulse weld has a lower fraction of high-angle grain boundaries and a coarser structure of Bain groups as opposed to the corresponding area of single pulse weld. Lower mechanical performance of double pulse welds produced at lower welding current is ascribed to the lower compressive residual stress normal to the plane of crack and the formation of martensitic structure in front of the pre-crack with a lower fraction of high-angle grain boundaries and coarser Bain groups.

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Quantifying residual stresses in resistance spot welding of 6061-T6 aluminum alloy sheets via neutron diffraction measurements

Cited by 29 publications

References 15 publications

Effect of Weld Schedule on the Residual Stress Distribution of Boron Steel Spot Welds

Effect of Weld Schedule on the Residual Stress Distribution of Boron Steel Spot Welds

Welding parameters influence on fatigue life and microstructure in resistance spot welding of 6061-T6 aluminum alloy

Effect of pulse scheme on the microstructural evolution, residual stress state and mechanical performance of resistance spot welded DP1000-GI steel

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