อิทธิพลของการเชื่อมความต้านทานแบบจุดที่มีต่อความต้านทานแรงดึงเฉือนและการเกิดสารประกอบเชิงโลหะระหว่างรอยต่อต่างชนิดของเหล็กกล้าคาร์บอนผสมต่ำ SPFH780 และอะลูมิเนียมผสม 5052

Prajak Jattakul; Yingyos  Thipsrirach; Sarawut  Junklang; Watchanachai  Joompha; Thiti  Mhoraksa; Phichet  Hankla; Patcharaporn Udon; Niwat  Mookam; Jittiwat  Nithikarnjanatharn; Wannisa  Nutkhum; Teerawut  Khuenkaew; Worachai  Mansilp; Pichit  Kaewkosum; Vichai  Boonkong

Authors

Prajak Jattakul Department of Industrial Engineering, Faculty of Integrated Engineering and Technology, Rajamangala University of Technology Tawan−Ok, Chanthaburi Campus
Yingyos Thipsrirach Department of Industrial Engineering, Faculty of Integrated Engineering and Technology, Rajamangala University of Technology Tawan−Ok, Chanthaburi Campus
Sarawut Junklang Department of Industrial Engineering, Faculty of Integrated Engineering and Technology, Rajamangala University of Technology Tawan−Ok, Chanthaburi Campus
Watchanachai Joompha Department of Industrial Engineering, Faculty of Integrated Engineering and Technology, Rajamangala University of Technology Tawan−Ok, Chanthaburi Campus
Thiti Mhoraksa Department of Industrial Engineering, Faculty of Integrated Engineering and Technology, Rajamangala University of Technology Tawan−Ok, Chanthaburi Campus
Phichet Hankla Department of Industrial Engineering, Faculty of Integrated Engineering and Technology, Rajamangala University of Technology Tawan−Ok, Chanthaburi Campus
Patcharaporn Udon Department of Industrial Engineering, Faculty of Integrated Engineering and Technology, Rajamangala University of Technology Tawan−Ok, Chanthaburi Campus
Niwat Mookam Department of Industrial and Production Engineering, Faculty of Engineering, Rajamangala University of Technology Rattanakosin, Wang Klai Kangwon Campus
Jittiwat Nithikarnjanatharn Department of Industrial Engineering, Faculty of Engineering and Technology Rajamangala University of Technology Isan
Wannisa Nutkhum Department of Industrial Engineering, Faculty of Engineering and Technology Rajamangala University of Technology Isan
Teerawut Khuenkaew Department of Industrial Engineering, Faculty of Engineering Rajamangala University of Technology Isan, Khon Kaen Campus
Worachai Mansilp Department of Welding, Chanthaburi Technical College, Institute of Vocational Education: Eastern Region
Pichit Kaewkosum Department of Electric Vehicle Engineering, Faculty of Integrated Engineering and Technology, Rajamangala University of Technology Tawan−Ok, Chanthaburi Campus
Vichai Boonkong Department of Production Technology, Surin Technical College, Institute of Vocational Education: Eastern Northeastern Region 5

Keywords:

Resistance Spot−Welded, SPFH780 Low−Alloy Carbon Steel, 5052 Aluminum Alloy, Intermetallic Compound, Tensile Shear Strength

Abstract

This research investigates the influence of welding current levels and pulse configurations on the mechanical properties and intermetallic compound (IMC) formation behavior at the interface of resistance spot−welded (RSW) joints between SPFH780 low−alloy carbon steel 1.60 mm thick and 5052 aluminum alloy 1.50 mm thick. A comparative study was conducted using single−pulse and double−pulse current modes at intensities of 11000, 11500, 12000, and 12500 Amperes (A). The results demonstrate that double−pulse RSW yields significantly higher average tensile−shear strengths than single−pulse welding across all tested current levels. Notably, a peak average tensile shear strength of 4534.654 N was achieved at a current of 12500 A using the double−pulse mode. This improvement is attributed to the superior thermal cycle control and the reduction of excessive heat accumulation inherent in the double−pulse delivery, which effectively limits the growth of brittle Fe₂Al₅ and FeAl₃ IMC layers to an optimal thickness. Microstructural analysis via scanning electron microscopy (SEM) and energy−dispersive X−ray spectroscopy (EDS) further revealed that increasing the welding current directly enhances heat input, thereby expanding the weld nugget size and improving the mechanical load−bearing capacity of the joints. In conclusion, the double−pulse welding process serves as a highly effective technique for enhancing mechanical performance and regulating interfacial IMC formation in dissimilar metal joining.

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