Converting the pneumatic- to servo-based system in resistance spot welding: analyzing the dissimilar weld joints for two welding schemes

  • Nachimani Charde
Technical Paper


This experimental investigation analyzes the performance of two types of electrode-actuating systems, pertaining to welding current increments in resistance spot welding. Alternating current (AC) waveform, 75 kVA apparent power and C-typed body frame of a welding machine are engaged to undertake the entire experiment. Initially, the pneumatic-supported compression technique is employed to weld the dissimilar combinations of metal sheets; the carbon steel and stainless steel in this case. Since the pneumatic cylinder consumes reasonable amount of time to operate, it is limited to handle the single-periodic AC waveform which is designated as the single current and single force (SISF) welding scheme. As the pneumatic-based system is mechanically redesigned and refitted for the servo-supported compression, thereafter it paved ways to manipulate the compression variables as to support the dual current and dual force (DIDF) welding scheme in addition to the original SISF welding scheme. After the successful attempts for both schemes, the welded samples underwent the tensile test, hardness test, post-crack pattern recognition and finally subjected to the metallurgical observation to characterize the differences and anomalies. The result shows that the weld formations have been greatly improved in servo system for the SISF and DIDF compared to the pneumatic SISF welding scheme.


Spot welding Electrode actuation system Servo and pneumatic system 



The funding was provided by Advan-kt Research and Development [M7(32)].


  1. 1.
    Charde N, Yusof F, Rajkumar R (2014) Material characterizations of mild steels, stainless steels, and both steel mixed joints under resistance spot welding (2-mm sheets). Int J Adv Manuf Technol 75(1–4):373–384CrossRefGoogle Scholar
  2. 2.
    Charde N (2014) Exploring the electrodes alignment and mushrooming effects on weld geometry of dissimilar steels during the spot welding process. Sadhana 39(6):1563–1572CrossRefGoogle Scholar
  3. 3.
    Aravinthan A, Nachimani C (2011) Analysis of spot welds growth on mild and stainless steel. Weld J 90:143–147Google Scholar
  4. 4.
    Tang H, Hou W, Hu SJ (2002) Forging force in resistance spot welding. Proc Inst Mech Eng Part B J Eng Manuf 216:957–965CrossRefGoogle Scholar
  5. 5.
    Podrzaj P, Simoncic S (2014) A machine vision-based electrode replacement measurement. Weld World 58:93–99CrossRefGoogle Scholar
  6. 6.
    Yang Y, Sung G (2011) Effect of resistance spot welding parameters on the austenitic stainless steel 304 grade by using 23 factorial designs. Adv Mater Res 216:666–670CrossRefGoogle Scholar
  7. 7.
    Cha BW, Na SJ (2003) A study on the relationship between welding conditions and residual stress of resistance spot welded 304-type stainless steels. J Manuf Syst 223:344–353Google Scholar
  8. 8.
    Jamasri MN, Ilman R, Soekrisno T (2011) Corrosion fatigue behaviour of RSW dissimilar metal welds between carbon steel and austenitic stainless steel with different thickness. Proced Eng 10:649–654CrossRefGoogle Scholar
  9. 9.
    Isaev AP (2006) A method for modeling the pneumatic drive and load carrying structure of resistance spot welding machines. Svar Proizvod 59(3):18–25Google Scholar
  10. 10.
    Lee WS (2004) Deformation and failure response of 304L stainless steel SMAW joint under dynamic shear loading. Mater Sci Eng 381:206–215CrossRefGoogle Scholar
  11. 11.
    Pouranvari M, Marashib SPH (2011) Failure mode transition in AHSS resistance spot welds, Part I: controlling factors. Mater Sci Eng A 528:8337–8343CrossRefGoogle Scholar
  12. 12.
    Pouranvari M, Marashi SPH, Safanama DS (2011) Failure mode transition in AHSS resistance spot welds. Part II: experimental investigation and model validation. Mater Sci Eng A 528:8344–8352CrossRefGoogle Scholar
  13. 13.
    Pouranvari M (2011) Effect of welding current on the mechanical response of resistance spot welds of unequal thickness steel sheets in tensile-shear loading condition. Int J Multidiscip Sci Eng 2:44–52Google Scholar
  14. 14.
    Dancette S, Fabregue D, Massardier V, Merlin J, Dupuy T, Bouzekri M (2012) Investigation of the tensile shear fracture of advanced high strength steel spot welds. Eng Fail Anal 25:112–122CrossRefGoogle Scholar
  15. 15.
    Fukumoto S (2008) Small scale resistance spot welding of austenitic stainless steels. Mater Sci Eng A 492:243–249CrossRefGoogle Scholar
  16. 16.
    Lee W (2012) The influences of nugget diameter on the mechanical properties and the failure mode of resistance spot-welded meta stable austenitic stainless steel. Mater Des 33:292–299CrossRefGoogle Scholar
  17. 17.
    Mehdi M, Abadi A, Pouranvari M (2008) Correlation between macro/micro structure and mechanical properties of dissimilar RSW of AISI 304 austenitic stainless steel and AISI 1008 low carbon steel. Sci Pap Assoc Metall Eng Serbia 2:1–10Google Scholar
  18. 18.
    Marashi P, Pouranvari M, Amirabdollahian S, Abedi A, Goodarzi M (2008) Microstructure and failure behavior of dissimilar resistance spot welds between low carbon galvanized and austenitic stainless steels. Mater Sci Eng A 480:175–180CrossRefGoogle Scholar
  19. 19.
    Feramuz K (2009) The effect of process parameter on the properties of spot welded cold deformed AISI304 grade austenitic stainless steel. J Mater Process Technol 209:4011–4019CrossRefGoogle Scholar
  20. 20.
    Dursun O (2008) An effect of weld current and weld atmosphere on the resistance spot weld ability of 304L austenitic stainless steel. Mater Des 29:597–603CrossRefGoogle Scholar
  21. 21.
    Lee WS (2007) Effects of strain rate and welding current mode on micro structural properties of SUS 304L PAW welds. J Mater Process Technol 183:183–193CrossRefGoogle Scholar

Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2018

Authors and Affiliations

  1. 1.Advan-kt Research and DevelopmentKampung KepayangMalaysia

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