SPA-H atmosferik korozyona dayanıklı çelik saçların direnç nokta kaynağında hasar tiplerinin çekme-sıyırma dayanımına etkisi

Yıl 2018, Cilt: 22 Sayı: 2, 607 - 612, 01.04.2018

Nuri Akkaş

https://doi.org/10.16984/saufenbilder.337199

Öz

 Bu çalışmada raylı sistem araçlarında kullanılan SPA-H atmosferik
korozyona dayanıklı çelik saçların elektrik direnç nokta kaynağı ile
birleştirilmesinde oluşan hasar tiplerinin çekme-sıyırma dayanımına etkisi incelenmiştir.
120 kVA akım ve zaman kontrollü pinomatik bir direnç nokta kaynak makinesi
kullanılarak numuneler hazırlanmıştır. Kaynak zamanı 10, 15, 20, 25 ve 30
periyot (1 periyot = 0,02 s) olarak seçilmiştir.  Kaynak akım şiddeti 6 kA ile 11 kA arasında
0,5 kA artırılarak uygulanmıştır. Elektrot kuvveti 4 kN olarak sabit
tutulmuştur. Elde edilen nokta kaynaklı bağlantıların hasar tipleri ile çekme-sıyırma
dayanımı arasındaki ilişki araştırılmış ve sonuç olarak kaynak akım şiddeti ve
zamanının en uygun değerleri tespit edilmeye çalışılmıştır.

Anahtar Kelimeler

elektrik direnç nokta kaynağı, hasar tipi, çekme-sıyırma dayanımı

Failure mode effect on tensile-peel strength of resistance spot welds of SPA-H weathering steel sheets

Öz

In this study, influence of failure mode on tensile-peel
strength of resistance spot welds of SPA-H weathering steel sheets was
investigated. The weathering steels are widely used in the body of rolling
stock. The samples were obtained in a 120 kVA capacity electrical resistance
spot welding machine. The sheets were welded by RSW by fixing holding time,
clamping time and electrode force as well as changing welding current and
welding time. The prepared welding specimens were exposed to tensile-peel tests
in order to determine the joint strengths. The relation between failure mode and
tensile-peel strengths of obtained spot welded joints was researched, so the
optimum welding currents and times were advised.

Anahtar Kelimeler

resistance spot welding, SPA-H steel, failure mode, tensile-peel strength

Kaynakça

• [1] ASM, Metals Handbook: Welding, Brazing and Soldering, Volume 6, 1993.
• [2] AWS, Safety and health fact sheet, no: 21, 1999.
• [3] M.P., Groover, Fundamentals of modern manufacturing: materials, processes and systems, Third Edition, John Wiley & Sons Inc. 2007.
• [4] D., Özyürek, "An effect of weld current and weld atmosphere on the resistance spot weldability of 304L austenitic stainless steel", Materials and Design 29, pp. 597–603, 2008.
• [5] M., Jou, "Real time monitoring weld quality of resistance spot welding for the fabrication of sheet metal assemblies", Journal of Materials Processing Technology 132, pp. 102–113, 2003.
• [6] M., Morcillo, B., Chico, I., Diaz, H., Cano, D., Fuente, “Atmospheric corrosion data of weathering steels”, National centre for metallurgical research (CENIM-CSIC), Madrid, Spain, 2013.
• [7] T., Murata, “Weathering steel, in: R.W. Revie (Ed.)”, Uhlig's Corrosion Handbook, J. Wiley & Sons, New York, 2000.
• [8] ASM, Metals Handbook: Welding, Brazing and Soldering, Volume 6, 1993.
• [9] A. M., Al-Mukhtar, Q. Doos, "The Spot Weldability of Carbon Steel Sheet", Advances in Materials Science and Engineering, Volume 2013, 6 pages, 2013.
• [10] S.M. Hamidinejad, F. Kolahan, A.H. Kokabi, “The modeling and process analysis of resistance spot welding on galvanized steel sheets used in car body manufacturing”, Material Design 34, pp.759-767, 2012.
• [11] S. Aslanlar, “The effect of nucleus size on mechanical properties in electrical resistance spot welding of sheets used in automotive industry”, Material Design 27, pp. 125-131, 2006.
• [12] M.I. Khan, Ph.D. Thesis, University of Waterloo, 2007.
• [13] N. Akkas, E. Ilhan, “Effect of Welding Current on Mechanical Properties of Welding Joints in SPA-C Steel Sheets in Resistance Spot Welding”, Acta Physica Polonica A, Volume 125, No 2, pp. 497-499, 2014. DOI:10.12693/APhysPolA.125.497
• [14] N. Akkas, F. Varol, E. Ferik, E. Ilhan, U. Ozsarac, S. Aslanlar, “Effect of Welding Current on Mechanical Properties of Welding Joints in S235JR(Cu) Steel Sheets in Resistance Spot Welding”, Acta Physica Polonica A, Volume 125, No 2, pp. 500-502, 2014. DOI:10.12693/APhysPolA.125.500
• [15] N. Akkas, E. Ilhan, S. Aslanlar, F. Varol, “The Effect Of Nugget Sizes On Mechanical Properties In Resistance Spot Welding Of Spa-C Steel Sheets Used In Rail Vehicles”, Materials Testing, Volume 56 (10), pp. 879-883, 2014. DOI: 10.3139/120.110646
• [16] N. Akkas, E. Ilhan, F. Varol and S. Aslanlar. “Welding Time Effect on Mechanical Properties in Resistance Spot Welding of S235JR(Cu) Steel Sheets Used in Rail Vehicles”, Acta Physica Polonica A, Volume 129, No:4, pp. 541-543, 2016. DOI: 10.12693/APhysPolA.129.541
• [17] N Akkaş, Welding Time Effect on Tensile–Shear Loading in Resistance Spot Welding of SPA-H Weathering Steel Sheets Used in Railway Vehicles”, Acta Physica Polonica A, Volume 131, No:4, pp. 52-54, 2017. DOI: 10.12693/APhysPolA.131.52