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The paper analyzes the failure case of welded joint for energy storage device. The energy storage devices are made up of AISI 1040 steel cases or boxes. Bulging effect in these boxes exerts tensile load on welded joint and breaks them. Root cause analysis is done and the root cause is found out to be improper throat thickness of weld. To find out the solution, problem is analyzed theoretically and simulated in ANSYS R18.1 software for a constant tensile load of 16 KN. The results show that there is a linear correlation between strength of welded joint and throat thickness. These results are validated in actual experimentation by taking tensile test on the sample specimens. The design of experiment by Taguchi is done on three variables, viz., weld current, arc voltage and wire feed rate. The results of experimentation are compared with the result from theoretical calculation and ANSYS result. Optimized parameters are selected for implementation in welding of boxes. The performance of the device under modified parameters is examined, presented and discussed. [ABSTRACT FROM AUTHOR]

Bu araştırmada, 46 HRc sertlikteki silindir şekle sahip AISI 1040 çeliği için dörder seviyeden oluşan kesme hızı, ilerleme ve talaş derinliği parametrelerine göre Taguchi L16 deney tasarımı oluşturulmuştur. Tornalama sonucu oluşan yüzey pürüzlülüğü (Rt) değerleri ölçülmüştür. Ölçülen Rt değerleri için MINITAB14 programından yararlanılarak çoklu regresyon modelleri oluşturulmuş ve Taguchi analizleri gerçekleştirilmiştir. Rt için oluşturulan regresyon modellerinde deney sonuçlarına en yakın sonuçlar %99.8 belirtme katsayısı ile ikinci dereceden çoklu regresyon modeliyle elde edilmiştir. Taguchi tasarımında sinyal/gürültü (S/N) oranları belirlendi. ANOVA analizinde sırası ile ilerleme, talaş derinliği ve kesme hızının Rt değerine %95 güven düzeyinde etki ettiği elde edilmiştir. Oluşturulan regresyon modelleri ve Taguchi analizi sonucu Rt üzerinde en etkin parametrenin ilerleme olduğu sonucuna varılmıştır.

In this study, for the turning of AISI 1040 steel that has cylindrical shape and hardened up to 46 HRc, Taguchi L16 experimental design was created according to the parameters of cutting speed, feed rate and cutting depth which consist from four levels. Formed in result of turning, the total surface roughness (Rt) were measured. Regression models have been built. Taguchi analyzes were carried out utilizing by MINITAB 14 Program for measured values of Rt. The closest results of the test results, generated for the Rt regression model, were obtained with 99.8% specify coefficients in order second degrees regression model. Signal/Noise (S/N) ratios were determined in design of the Taguchi. In ANOVA analysis, it was obtained as an effect of the 95% confidence level on Rt values in order feed rate, cutting depth and cutting speed. The result of the regression model and Taguchi analysis was determined as feed rate to be the optimum parameter for Rt values. [ABSTRACT FROM AUTHOR]