Study on Intermediate Frequency Spot Welding Process of Hot Stamping High Strength Steel

Yang, Yu; Wang, Chao; Chen, Shu Jun; Lu, Zhen Yang

doi:10.4028/www.scientific.net/amr.339.375

Cited by 5 publications

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, other authors have identified the soft HAZ microstructure in boron steel welds to be tempered martensite. [9][10][11] The spot weld created through adaptively controlled welding also shows correlation between hardness and FWHM in Figure 17. Due to the size of the granularity of the neutron measurement, the measured change in FWHM at 2.5 and À2.5 mm does not correlate precisely to the sharp change in hardness at the same distances.…”

Section: E Peak Broadeningmentioning

confidence: 91%

“…The cause for this sudden drop has been established to be due to tempering of the parent martensitic microstructure. [9][10][11] The microstructural differences between the HAZ and nugget/BM are an influencing factor on failure; however, the location of the HAZ plays an important role as well. [12] The sharp notch tip of a spot weld, located at the weld nugget edge where the sheets start to separate, may cause a stress concentration when the weld is loaded.…”

Section: Press-hardened Boron Steel (22mnb5) Ismentioning

confidence: 99%

See 1 more Smart Citation

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

Raath

Norman

McGregor

et al. 2017

Metall Mater Trans A

View full text Add to dashboard Cite

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.

show abstract

Section: E Peak Broadeningmentioning

confidence: 91%

Section: Press-hardened Boron Steel (22mnb5) Ismentioning

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

View full text Add to dashboard Cite

show abstract

“…The cause for this sudden drop has been established to be due to tempering of the parent martensitic microstructure. [2][3][4] It is this microstructural mismatch between the hard nugget/ BM and soft HAZ which causes the HAZ to be a critical area, with reduced mechanical properties. [5] The varying material properties have a profound influence on the load-bearing capacity and failure strength of the weld as a whole.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Loading Responses and Failure Loci of a Boron Steel Spot Weld

Raath

Norman

McGregor

et al. 2018

Metall Mater Trans A

View full text Add to dashboard Cite

Boron steel, classed as an ultra high-strength steel (UHSS), has been utilized in anti-intrusion systems in automobiles, providing high strength and weight-saving potential through gage reduction. UHSS spot welds exhibit unique hardness distributions, with a hard nugget and outlying base material, but with a soft heat-affected zone in-between these regions. This soft zone reduces the strength of the weld and makes it susceptible to failure. Due to the interaction of various weld zones that occurs during loading, there is a need to characterize the loading response of the weld for accurate failure predictions. The loading response of certain weld zones, as well as failure loci, was obtained through physical simulation of the welding process. The results showed a significant difference in mechanical behavior through the weld length. An important result is that instrumented indentation was shown to be a valid, quantitative method for verifying the accuracy with which weld microstructure has been recreated with regard to the target weld microstructure.

show abstract

Optimizing Advanced High‐Strength Steel Joints via Regional Rapid Cooling in Resistance Spot Welding

Hıdıroglu,

Aydın,

Kahraman

2024

steel research int.

View full text Add to dashboard Cite

During resistance spot welding (RSW), the thermal cycles that occur cause microstructural differentiations in the heat‐affected zones of martensitic steels, leading to internal stresses. In this context, a new and innovative methodology has been developed to minimize the adverse effects of heterogeneous hardness changes in the welding area on joint durability. This methodology utilizes a unique prototype setup based on the regional rapid cooling (RRC) process, which is integrated into the welding machine and operates in synchronization with the machine during the process. Through this setup, the aim is to effectively control the microstructure and hardness values in the welding area. This innovative approach presents potential improvements in the field of welding technology by aiming to optimize material performance during the welding process. According to microstructure results, the RRC process has narrowed the heat‐affected zone to 1.27 mm, increased the hardness values by 9.2%, showed a 3% increase in tensile‐shear strength, a 9% increase in cross‐tension strength, and based on fatigue strength results, no fractures occurred in all specimens subjected to a force of 0.3 kN.

show abstract

Study on Intermediate Frequency Spot Welding Process of Hot Stamping High Strength Steel

Cited by 5 publications

References 3 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

Characterization of Loading Responses and Failure Loci of a Boron Steel Spot Weld

Optimizing Advanced High‐Strength Steel Joints via Regional Rapid Cooling in Resistance Spot Welding

Contact Info

Product

Resources

About