Spot Weld Fatigue of Dual Phase Steels

Yan, Benda; Zhu, Haiyan; Lalam, Sh.; Baczkowski, S.; Coon, Ted

doi:10.4271/2004-01-0511

Cited by 8 publications

(6 citation statements)

References 4 publications

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“…It is known that high welding currents conduce surface cracking in spot welds. 2 Thus, reducing the welding current and extending the welding time would be a quick solution to avoid cracking. However, in high volume production, the cycle time is a critical parameter and extending the cycle time is not an option in most cases.…”

Section: Resultsmentioning

confidence: 99%

“…It is known that high welding currents conduce surface cracking in spot welds 2. Thus, reducing the welding current and extending the welding time would be a quick solution to avoid cracking.…”

Section: Resultsmentioning

confidence: 99%

“…The heat generated by the weld current flowing through the bulk metal can be expressed by Joule's first law: Q = I 2 Rt , where Q is the heat generated by a current I of electrical resistance R for a time t . With the assumption of uniform flow of electric current, the heat generated in the bulk metal can be rewritten as: Q = I 2 rho L / At , where rho is the bulk resistivity with thickness L and contact area A .…”

Section: Discussionmentioning

confidence: 99%

“…Resistance spot welding is the main welding method for joining car bodies and truck cabins in the vehicle industry. With the introduction of advanced high strength steels (AHSSs), surface cracks of resistance spot welds were reported by Milititsky et al 1 Yan et al 2 showed that the occurrence of the surface cracks was foremost a result of improper process set-up and improper welding schedules. Sigler et al 3 showed that crack depths can exceed half the sheet thickness in resistance spot welds of hot dip and galvanneal AHSS.…”

Section: Introductionmentioning

confidence: 99%

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Surface breaking cracks in resistance spot welds of dual phase steels with electrogalvanised and hot dip zinc coating

Tolf

Hedegård

Melander

2013

Science and Technology of Welding and Joining

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In normal production of resistance spot welded galvanised structures, it is difficult to completely avoid surface breaking cracks. Known key factors to cause cracking are zinc coating, electrode wear during subsequent welding and insufficient electrode cooling. In this report, an embrittlement mechanism was investigated that could be coupled to the galvanisation method for dual phase steels. With identical bulk material and weld parameters, the first 50 spot welds were crack free with electrogalvanised coating, while only 10 out of 50 were crack free with hot dip galvanised coating. Energy dispersive X-ray spectroscopy analysis of the worn electrode surfaces used for welding of the hot dip galvanised coating revealed areas of aluminium oxide. Since aluminium oxide is a very strong isolator, the electrical resistance will increase, which in turn is suggested to increase the surface temperature of the spot weld and thereby increase the probability for liquid metal embrittlement and surface cracks.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Surface breaking cracks in resistance spot welds of dual phase steels with electrogalvanised and hot dip zinc coating

Tolf

Hedegård

Melander

2013

Science and Technology of Welding and Joining

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“…Some researchers [8] demonstrated a considerable deterioration in the mechanical properties of galvanised TRIP steel containing LME cracks. In contrast, other researchers [9, 10] suggested only a small or negligible contribution of welding cracks to the mechanical properties. Such a disparity within the literature may arise from the variation in the types of LME cracks depending on the crack-initiation site.…”

Section: Introductionmentioning

confidence: 86%

Effect of Type-B liquid metal embrittlement cracks on high-cycle fatigue properties of spot-welded 1180 TRIP steel

Jang

Kwon

Kim

et al. 2021

Science and Technology of Welding and Joining

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This study examines the effect of Type-B liquid metal embrittlement (LME) cracks on high-cycle fatigue resistance of a spot-welded plate of transformation-induced plasticity (TRIP) steel. Tensile shear and cross tension were employed to simulate a spot-welded component subjected to a complex state of stress. Interestingly, neither the existence nor the depth of Type-B LME cracks changed the high-cycle fatigue resistance of the spot-welded samples under the two deformation modes tested. The finite-element analysis revealed the formation of maximum local stress at the sample notch, which acted as a crack-initiation site. It should be noted that this site was not changed even upon adding a Type-B LME crack to the simulation model.

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Liquid Metal Embrittlement of Galvanized Steels During Industrial Processing: A Review

Ling

Wang

Kong

2018

Transactions on Intelligent Welding Manufacturing

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Spot Weld Fatigue of Dual Phase Steels

Cited by 8 publications

References 4 publications

Surface breaking cracks in resistance spot welds of dual phase steels with electrogalvanised and hot dip zinc coating

Surface breaking cracks in resistance spot welds of dual phase steels with electrogalvanised and hot dip zinc coating

Effect of Type-B liquid metal embrittlement cracks on high-cycle fatigue properties of spot-welded 1180 TRIP steel

Liquid Metal Embrittlement of Galvanized Steels During Industrial Processing: A Review

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