The Cryogenic Treatment Of The Laser Weld Junctions Of Automotive Steel

Abstract

Öz Bu çalışmada, kriyojenik işlemin HSLA kalite ticari otomotiv sac kaynaklı birleştirmelerinin sertlik ve aşınma özelliklerine etkisi incelenmiştir. Lazer kaynak işlemleri; katı hal lazer kaynağı olarak, 1 kW lazer ışın gücünde ve 250 mm.s-1 ilerleme hızında uygulanmıştır. Bu kaynak işlemi alın (butt) pozisyonunda ve dolgu metalsiz olarak çift taraflı gerçekleştirilmiştir. Kriyojenik işlem, HSLA kalite çeliklere, kaynak öncesi, kaynak sonrası olacak şekilde uygulanmış ve bu şekilde gruplandırılmıştır. Kriyojenik işlemler -196 derece 24 saat süreyle ±1 oC/min. soğutma ısıtma hızıyla uygulanmıştır. Aşınma testleri lineer ileri geri aşındırma test cihazında 10N ve 20N yük altında toplam 600 m mesafe olarak gerçekleştirilmiştir. Adımlar 200 m olarak oluşturulmuş olup her adımda ağırlık ölçümleri ve sürtünme katsayıları tespit edilmiştir. Deneysel sonuçlarda lazer kaynaklı numune 10 N yük altında en iyi aşınma performansını gösterirken artan yük olan 20 N en düşüş aşınma performansını göstermiştir. İlave olarak artan yükte, kriyojenik işlemin de aşınma direncini artırdığını ve lazer kaynak işlem sonrası uygulanan DCT’nin aşınma için kaynaklı numuneler arasında iyi performansı gösterdiği tespit edilmiştir. Anahtar Kelimeler Lazer kaynağı, Aşınma, HSLA, Kriyojenik işlem Abstract In this study, the effect of cryogenic treatment on the hardness and wear properties of HSLA quality commercial automotive sheet welded joints was investigated. Laser welding processes; It was applied as a solid state laser source with a laser beam power of 1 kW and a feed rate of 250 mm.s-1. This welding process was performed on both sides in the butt position and without filler metal. Cryogenic treatment has been applied to HSLA quality steels before and after welding and has been grouped as such. Cryogenic processes -196°C for 24 hours ±1 oC/min. cooling was applied at the heating rate. Abrasion tests were carried out on a linear back and forth abrasion test device under 10N and 20N loads at a total distance of 600 m. The steps were created as 200 m and weight measurements and friction coefficients were determined for each step. In the experimental results, the laser welded sample showed the best wear performance under 10 N load, while the 20 N decreased wear performance with increasing load. In addition, it was found that at increasing load, the cryogenic treatment also increased the wear resistance, and the DCT applied after laser welding showed good performance among welded specimens for wear. Key Words Laser welding, Wear, HSLA, Cryogenic treatment

Keywords

• Lazer kaynağı
• Aşınma
• HSLA
• Kriyojenik işlem

The Cryogenic Treatment Of The Laser Weld Junctions Of Automotive Steel

Abstract

In this study, the effect of cryogenic treatment on the hardness and wear properties of HSLA quality commercial automotive sheet welded joints was investigated. Laser welding processes; It was applied as a solid state laser source with a laser beam power of 1 kW and a feed rate of 250 mm.s-1. This welding process was performed on both sides in the butt position and without filler metal. Cryogenic treatment has been applied to HSLA quality steels before and after welding and has been grouped as such. Cryogenic processes -196°C for 24 hours ±1 oC/min. cooling was applied at the heating rate. Abrasion tests were carried out on a linear back and forth abrasion test device under 10N and 20N loads at a total distance of 600 m. The steps were created as 200 m and weight measurements and friction coefficients were determined for each step. In the experimental results, the laser welded sample showed the best wear performance under 10 N load, while the 20 N decreased wear performance with increasing load. In addition, it was found that at increasing load, the cryogenic treatment also increased the wear resistance, and the DCT applied after laser welding showed good performance among welded specimens for wear.

Keywords

• Laser welding
• Wear
• HSLA
• Cryogenic treatment

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