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http://dx.doi.org/10.5762/KAIS.2017.18.12.644

Evaluation of Resistance Spot Weldability of SGAFC1180 Steel  

Shin, Seok-Woo (Korea Institute of Industrial Technology)
Lee, Jong-Hun (GajinTech Co., Ltd.)
Kim, Dae-Hwan (Chungnam Institute for Regional Program Evaluation)
Park, Sang-Heup (Department of Mechanical & Automotive Engineering, Kongju University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.18, no.12, 2017 , pp. 644-649 More about this Journal
Abstract
In the automobile industry, there is growing demand for lightweight vehicles due to environmental problems and rising oil prices. Therefore, aluminum alloys and special materials are being used to reduce the weight of vehicles, but there are still many difficulties to overcome in terms of cost and strength. Therefore, the application of advanced high strength steel (AHSS)is increasing. AHSS has good strength and formability.Safety regulations are becoming stricter, and 1.2-GPa super-high-strength steels are gradually being applied for the center pillar and roof rails. Thus, the application of different kinds of steels in automobile bodiesis also increasing gradually. This study evaluates the resistance point weldability and the characteristics of a welded part of SGAFC1180 1.2t steel. A simulation was used to observe the nugget formation and its growth behavior. The prediction performance showed a similar tendency within an error rate of 10%. Also, the effect of this behavior on the process resistance and dynamic resistance was investigated,along with the correlation between the shear tensile strength and nugget diameter.
Keywords
AHSS; Current; Resistance spot welding; SGAFC1180; Waveform;
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