Elektrik direnç punta kaynağı ile kaynak edilmiş TWIP çeliklerinde kaynak parametrelerinin Taguchi yöntemi ile optimizasyonu

Yıl 2018, Cilt: 24 Sayı: 4, 650 - 657, 17.08.2018

Mümin Tutar Hakan Aydın , Ali Bayram

Öz

Bu
çalışmanın amacı, TWIP çelik saclarının elektrik direnç punta kaynağı ile
birleştirmelerinde Taguchi metodu kullanarak kaynak parametrelerinin optimize
edilmesidir. Kaynak akımı, kaynak zamanı ve elektrot baskı kuvveti gibi kaynak
parametrelerinin değerleri, rastgele yaklaşımlı L9 Taguchi ortogonal dizine
göre belirlenmiştir. Optimum kaynak parametreleri, kaynaklı numunelerin en
yüksek kopma yüküne göre tahmin edilmiş ve her bir parametrenin kopma yükü
üzerindeki etkisi sinyal/gürültü (S/N) oranı ve varyans analizi (ANOVA) ile
değerlendirilmiştir. Optimum kaynak akımı, kaynak zamanı ve elektrot kuvveti
sırasıyla 12 kA, 300 ms and 3000 N olarak bulunmuştur. ANOVA sonuçları, kopma
yükü üzerindeki en yüksek istatiksel etkiye %78.73 ile kaynak akımının sahip
olduğunu gösterirken, kaynak akımını da sırasıyla kaynak zamanı ve elektrot
baskı kuvvetinin takip ettiğini göstermiştir. Elektrik direnç punta kaynağı ile
kaynak edilmiş birleştirmelerin kopma yükleri kaynak akımı ve elektrot baskı
kuvvetiyle artmıştır. Ancak, yüksek kaynak zamanlarında nispeten daha düşük
kopma yükleri gözlenmiştir. Ayrıca, seçilen kaynaklı numunelerin kırılma
yüzeyleri taramalı elektron mikroskobu (SEM) kullanılarak karakterize
edilmiştir. Bu incelemede, daha yüksek kaynak mukavemetine sahip
birleştirmelerin nispeten daha sünek kırılma karakteristiği sergilediği
görülmüştür.

Anahtar Kelimeler

TWIP çeliği, Elektrik direnç punta kaynağı, Kaynak parametreleri, Kaynak mukavemeti, Optimizasyon

The optimisation of welding parameters for electrical resistance spot-welded TWIP steels using a Taguchi method

Öz

The
aim of this work is to optimize the welding parameters of electrical resistance
spot welded TWIP steel sheets using a Taguchi method. The welding parameters,
such as weld current, welding time and electrode force, were determined
according to the Taguchi orthogonal array L9 using a randomized approach. The
optimum welding parameters for the peak tensile shear load of the joints were
predicted, and the individual importance of each parameter on the tensile shear
load of the resistance spot weld was evaluated by examining the signal-to-noise
(S/N) ratio and analysis of variance (ANOVA). The optimum weld current, welding
time and electrode force were found to be 12 kA, 300 ms and 3000 N,
respectively. The ANOVA results indicated that the weld current has the highest
statistical effect with 78.73% on the tensile shear load, followed by the
welding time and electrode force. The tensile shear load of the resistance spot
welding joints increased with increasing weld current and electrode force. But,
higher welding time led to relatively lower tensile shear load. In addition,
the fracture surface characterization of the selected joints was conducted
using scanning electron microscopy (SEM) technique. In this examination, it has
been found that the joints having higher weld strength exhibited a relatively
more ductile fracture characteristic.

Anahtar Kelimeler

TWIP steel, Electrical resistance spot welding, Welding parameters, Weld strength, Optimisation.

Kaynakça

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