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Journals / Afyon Kocatepe Üniversitesi Fen ve Mühendislik Bilimleri Dergisi / 2026 / Cilt: 20 Sayı: 1

Microstructural and Mechanical Properties of Nd:YAG Laser Welded Dissimilar DP600-DP1000 Steel Sheets

Nd:YAG Lazer Kaynağı ile Birleştirilen Farklı Türdeki DP600-DP1000 Çeliklerinde Mekanik ve Mikroyapı Özellikleri

Oğuz Tunçel(BURSA ULUDAĞ ÜNİVERSİTESİ)0000-0002-6886-6367
Hakan Aydın(BURSA ULUDAĞ ÜNİVERSİTESİ)0000-0001-7364-6281
Şükriye Çetin(BURSA ULUDAĞ ÜNİVERSİTESİ)0000-0002-3888-699X
Pages
155–164
Publication Date
2020-03-17
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

However, the lowest microhardness values were observed in the transition zone on DP1000 side.

📌 3 Key Takeaways

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Objective & Hypothesis:In this study, the DP600 and DP1000 steel sheets were joined with the pulsed Nd: YAG (Neodymium-doped Yttrium Aluminum Garnet (Y3Al5O12)) laser welding and, mechanical and microstructure properties of the dissimilar welds were experimentally investigated.
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Key Findings & Data:So, the main aim of this study was determining the influence of pulse frequency on the mechanical properties of pulsed Nd:YAG laser welded DP600-DP1000 steel sheet joints.
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Conclusion & Impact:However, the lowest microhardness values were observed in the transition zone on DP1000 side.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:DPçelikleri · Nd:YAG lazer kaynağı · Farklı malzemelerin kaynağı

Abstract

In this study, the DP600 and DP1000 steel sheets were joined with the pulsed Nd: YAG (Neodymium-doped Yttrium Aluminum Garnet (Y3Al5O12)) laser welding and, mechanical and microstructure properties of the dissimilar welds were experimentally investigated. As known, there is a demand in modern automotive industry for performing dissimilar weld of DP steel sheets. In the laser welding operation, the selection of welding parameters affects the final properties of welds substantially. So, the main aim of this study was determining the influence of pulse frequency on the mechanical properties of pulsed Nd:YAG laser welded DP600-DP1000 steel sheet joints. For this purpose, dissimilar (DP600-DP1000) steel sheets were double-sided welded with the butt joint. To analyze the welding performance, microstructural studies, tensile tests and microhardness measurements were carried out. The weld cross-sections of the joints revealed three main distinct macrostructural zones: Base metal and heat affected zone of both steels, and fusion zone. Moreover, a transition zone was observed between the base metal and heat affected zone on the DP1000 sides. Higher pulse frequency led to deeper penetration and larger fusion zone and heat affected zone. The joints welded without any filler wires had macro porosities in the fusion zones. The tensile properties of the joints significantly increased with increasing pulse frequency. The tensile properties obtained in this study may be quite satisfactory for automotive industrial applications. Fusion zone had the highest microhardness values. However, the lowest microhardness values were observed in the transition zone on DP1000 side.

Özet

Bu çalışmada DP600 ve DP1000 çelik sacları darbeli Nd:YAG ( Neodymium-doped Yttrium Aluminum Garnet (Y3Al5O12)) lazer kaynağı ile birleştirilmiş ve farklı türdeki sacların kaynağında mekanik ve mikro yapı özellikleri deneysel olarak incelenmiştir. Bilindiği gibi modern otomotiv endüstrisinde farklı türdeki DP çeliklerimin birleştirilmesinde talep vardır. Lazer kaynak işleminde kaynak parametrelerinin seçimi kaynak nihai özelliklerini büyük ölçüde etkiler. Bu yüzden bu çalışmanın amacı Nd:YAG lazer kaynağı yapılan DP600-DP1000 çeliklerine kaynak parametrelerinden darbe frekansının mekanik özelliklere etkilerinin belirlenmesidir. Bu amaçla farklı türdeki DP600-DP1000 sacları çift taraflı olarak alın kaynağı ile birleştirilmiştir. Kaynak performansını analiz etmek için mikro yapı çalışmaları, çekme testleri ve mikro sertlik ölçümleri gerçekleştirilmiştir. Kaynak kesiti temel malzeme, ısı tesiri altındaki bölge ve ergime bölgesinden oluşan 3 farklı makro yapısal bölge göstermiştir. Ayrıca DP1000 tarafında ısı tesiri altındaki bölge ile temel malzeme arasında bir geçiş bölgesi gözlenmiştir. Yüksek darbe frekansı derin penetrasyon ve daha geniş ergime bölgesi ve ısı tesiri altındaki bölgeye neden olmuştur. Dolgu teli olmadan gerçekleştirilen kaynaklar ergime bölgesinde makro gözenekler içermektedir. Kaynaklı birleştirmenin mukavemeti darbe frekansındaki artışla beraber önemli ölçüde artmıştır. Bu çalışmada elde edilen çekme mukavemeti özellikleri otomotiv endüstrisi için oldukça tatmin edicidir. Ergime bölgesi en yükske mikro sertlik özelliklerine sahiptir. Bunun yanında en düşük mikro sertlik değerleri DP1000 tarafından temel malzeme ile ısı tesiri altındaki bölge arasındaki geçiş bölgesinde gözlenmiştir.

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Cite This Article

Tunçel, O., Aydın, H., Çetin, Ş. (2020). Microstructural and Mechanical Properties of Nd:YAG Laser Welded Dissimilar DP600-DP1000 Steel Sheets. Afyon Kocatepe Üniversitesi Fen ve Mühendislik Bilimleri Dergisi, Cilt: 20 Sayı: 1, 155–164. https://doi.org/10.35414/akufemubid.620768

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