Strength Optimization of Resistance Spot Welded TWIP Steel by Taguchi Method

Year 2019, , 778 - 787, 31.01.2019

Hayriye Ertek Emre

https://doi.org/10.29130/dubited.476683

Cited By: 4

Abstract

The microstructure and mechanical properties of TWIP (TWinning Induced Plasticity) sheets, one of the
members of Advanced High Strength Steel (AHSS), are affected by excessive thermal cycles such as welding
and heat treatment. In this study, TWIP steel sheets are joined with the resistance spot weld in various welding
parameters for optimization of the strength and weld nugget geometry. For this purpose, the optimization of the
tensile shear strength and weld nugget diameter of the weldments were determined by using Taguchi
experimental design method and L9 orthogonal array was chosen. Based on the analysis test results, the optimum
welding parameter which provides the best strength and weld nugget quality for the resistance spot welded
TWIP steel was determined by Taguchi analysis as 7kA welding current and 20 cycle welding time (A2B3). It
has been determined that the most effective variable for weld nugget diameter value is welding time, while the
most important welding parameter for effecting tensile shear strength is the welding current. 

Keywords

TWIP steels; Taguchi method; Tensile shear strength; Weld nugget diameter

Taguchi Yöntemi ile Nokta Direnç Kaynaklı TWIP Çeliklerin Dayanım Optimizasyonu

Abstract

İleri yüksek mukavemetli çeliklerin (Advanced High Strength Steel-AHSS) üyelerinden biri olan TWIP
(TWinning Induced Plasticity- İkizlenmeyle plastisite kazanan) çeliklerin mikroyapı ve mekanik özellikleri,
kaynak ve ısıl işlem gibi yüksek termal döngülerden etkilenirler. Bu çalışmada, mukavemet ve kaynak çekirdek
geometrisinin optimizasyonu için çeşitli kaynak parametrelerinde TWIP çelik saclar nokta direnç kaynağı ile
birleştirilmiştir. Bu amaçla, deney numunelerinin çekme makaslama dayanımı ve kaynak çekirdek çapının
optimizasyonu Taguchi deneysel tasarım yöntemi kullanılarak belirlenmiş ve L9 ortogonal dizini seçilmiştir.
Analiz test sonuçlarına dayanarak, Taguchi analiziyle belirlenen nokta direnç kaynaklı TWIP çeliği için en iyi
mukavemet ve kaynak çekirdek kalitesini veren optimum kaynak parametresi, 7 kA kaynak akımı ve 20 çevrim
kaynak zamanı (A2B3) olarak belirlenmiştir. Çekme makaslama dayanımının etki eden en önemli kaynak
parametresi kaynak akımı iken, kaynak çekirdek çapı değeri için en etkili değişkenin kaynak zamanı olduğu
belirlenmiştir.

Keywords

TWIP çelikleri, Taguchi metodu, Çekme makaslama dayanımı, Kaynak çekirdek çapı

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