International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 05 | May -2017
p-ISSN: 2395-0072
www.irjet.net
REVIEW ON OPTIMIZATION TECHNIQUES USED IN RSW PARAMETERS FOR SIMILAR AND DISSIMILAR METALS SHEETS JOINING Sushree Sefali Mishra1, Malaya Kumar Debta2, Kamal Pal3 1PhD 2M.
scholar, Department of metallurgical and materials engineering, NIT Rourkela, sector-2, Rourkela, odisha Tech scholar, Dept of Metallurgical and materials Engineering, NIT Rourkela, sector-2, Rourkela, Odisha 3Associate professor, Department of Production Engineering, VSSUT, Burla, Sambalpur, Odisha
---------------------------------------------------------------------***--------------------------------------------------------------------Performing the experiment is not the only requirement for us but to improve the joint strength. For the strength technique for thin metal sheets joining. The process is mostly improvement or optimization of joint strength there are adopted in automobile industries. This is robot enabled so different optimization techniques. Different researchers also performs or operates at high speed. For RSW the most have used different optimization techniques with different promising operating parameters are electrode load, current operating parameters and have given different results. and time. Again the time also involves different times as weld time, squeeze time, hold time and off time. Here in this paper different optimization techniques used for optimization of RSW operating process parameters are so far discussed. The discussion is broadened to both similar and dissimilar metal joining.
Abstract - : Resistance spot welding is a frequently used
Key Words: RSW, optimization, operating parameter
1. INTRODUCTION Resistance spot welding is a conventional welding technique used to join thin metal sheets. Basically this is a method of joining in case of automobile body parts where it may join similar as well as dissimilar metal sheets according to strength requirement. There are thousands of spot in a automobile body there spot welding is required and it is performed by resistance spot welding (RSW). Main parameters which have tremendous effect on the joint strength are current, electrode force and time. Whole spot welding setup with the circuits is shown in figure 1. Again the time is classified as squeeze time, hold time, weld time and off time shown in figure 2. Among all these times weld time is the most effective time. But squeeze time and hold time also have effect on the weld nugget which drastically has effect on the joint strength.
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2. LITERATURE REVIEW Different researchers are working on different aspects of resistance spot welding like geometry, tool geometry, nugget size, strength, operating parameters etc. But in all aspects the main objective is to obtain the optimal result to get good joint strength and durability. k. Taher chaouch et. al. [2] in 2013 gave elaborate study on development of weld nugget in dissymmetric assemblies. Coated steel sheets of ESG10/10(Zn coated mild steel) and DO6G10/10(dual phase steel) were used. Simulation was done by electro-thermal-metallurgical model in finite element code SYSWELD. In this experimentation contact condition and thermal contact resistance were determined using LIMATB. This analysis was based on nugget development in identical sheets, dissimilar sheet weld, effect of thickness ratio, combined effect of thickness ratio and dissymmetry and development of weld nugget in three sheet configuration. In identical sheet joining initial heating was found in sheet interface which propagates in plate in a symmetric
Figure 1 : RSW experimental set up with circuit [1]
Š 2017, IRJET
Figure 2 : step wise supply of current and pressure at different times
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