Laser Cladding Application Using Different Powder Materials on Spheroidal Graphite Cast Iron Mold Material

Öz

Laser cladding is based on the principle of melting the base material via a laser beam by spraying the powder material; it comes to stand out by providing a new approach by creating surface modification. Using UTP PLASweld Ferro55 and UTP PLASweld 73G3 powder materials, laser cladding was implemented on GGG-70L ductile cast iron die material; the effects of two different powder filling materials on the cladding quality were investigated. The obtained results were aimed to be used in automotive sheet metal forming die repairs. The effects of laser power, scanning speed, powder flow rate parameters on weld geometry, microhardness, crack, and pore formations were investigated, and optimum process parameters were determined by using Taguchi L9 orthogonal array. Using high-level laser power (1,7 kW) for Ferro55 material and low-level scanning speed (9 mm/s) parameters for UTP 73G3 powder material were achieved optimum results in terms of welding geometry. While Ferro 55 material was better in terms of pore formation; UTP 73G3 material had a lower risk of crack formation. The maximum microhardness values obtained were close to each other (777,3 HV0,1.). 

Anahtar Kelimeler

• Spheroidal Graphite Cast Iron
• Laser Cladding
• Process Parameters
• Optimization
• Cladding Geometry

Küresel Grafitli Dökme Demir Kalıp Malzemesi Üzerine Farklı Toz Malzemeleri Kullanılarak Lazer Dolgu Kaynağı Uygulaması

Öz

Lazer dolgu kaynağı, toz malzemenin püskürtülerek bir lazer ışını yardımı ile temel malzemenin ergitilmesi prensibine dayanır; yüzey modifikasyonu yaratarak yeni bir yaklaşım sağlaması ile ön plana çıkmaktadır. UTP PLASweld Ferro55 ve UTP PLASweld 73G3 toz malzemeleri kullanılarak GGG-70L küresel grafitli dökme demir kalıp malzemesi üzerine lazer dolgu kaynağı uygulanmıştır; farklı iki toz dolgu malzemesinin kaplama kalitesi üzerindeki etkileri araştırılmıştır, elde edilen çıktıların otomotiv sac metal şekillendirme kalıplarının tamiratında kullanılması hedeflenmiştir. Lazer gücü, ilerleme hızı, toz debisi parametreleri değişimlerinin kaynak geometrisi, mikro sertlik, çatlak ve gözenek oluşumuna etkisi incelenmiştir, Taguchi L9 ortagonal dizisi kullanılarak optimum proses parametreleri belirlenmiştir. Ferro55 malzemesi için yüksek seviye lazer gücü (1,7 kW), UTP 73G3 toz malzemesi için düşük seviye ilerleme hızı (9 mm/s) parametrelerinin kullanılması kaynak geometrisi açısından optimum sonuçlar vermektedir. Gözenek oluşumu açısından Ferro 55 malzemesi daha iyi konumda iken; UTP 73G3 malzemesinin çatlak oluşumu riski daha düşüktür. Elde edilen maksimum mikro sertlik değerleri birbirine yakındır (777,3 HV0,1).

Anahtar Kelimeler

• Küresel Grafitli Dökme Demir
• Lazer Dolgu Kaynağı
• Proses Parametreleri
• Optimizasyon
• Kaynak Geometrisi

Kaynakça

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