Effects of Peak Current and Nozzle Offset Distance on Wire Electrical Discharge Machining of Titanium

DOI: 10.14416/j.ind.tech.2020.03.007


  • Patittar Nakwong Department of Applied Science, Major of Industrial management, Faculty of Science and Technology, Phranakhon Si Ayutthaya Rajabhat University
  • Theeraphol Subboon Department of Applied Science, Major of Industrial management, Faculty of Science and Technology, Phranakhon Si Ayutthaya Rajabhat University


Wire electrical discharge machine, Titanium, Material removal rate, Surface roughness, Kerf width


The objective of this research was to study the effects of peak current and nozzle offset distance (NOD) as the arc gap on wire electrical discharge machining (WEDM) of titanium. Peak current was tested at three levels of 6, 7 and 8 A, while NOD was varied at 150, 175 and 200 mm. These three variables were assessed to achieve the highest material removal rate (MRR) that generated minimal surface roughness and kerf width. Results showed that a peak current of 8 A with NOD at 200 mm recorded the highest MRR of 0.57 mm3/min, while peak current at 6 A and NOD at 150 mm gave the lowest surface roughness at 2.02 µm and kerf width of 0.33 mm. A scanning electron microscope (SEM) was used to analyze the surface of the titanium. Findings determined that the lowest peak current (6A) and lowest NOD (150 mm) gave optimal surface roughness, MRR and surface cracks. Thus, these parameters can be used to improve the surface of titanium workpieces.


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บทความวิจัย (Research article)