Lazer Kaynaklı HSLA Sac Malzemelerde Geri Esnemenin Deneysel Araştırılması

Bu çalışmada farklı güç parametrelerinde lazer kaynağı ile birleştirilen HSLA300 sac malzemelerin bükülme operasyonu sonrası geriesneme davranışına etki eden parametreler deneysel araştırılmıştır. Kaynak parametresi olarak kaynak gücü (1300, 1400 ve 1500 watt),proses parametresi olarak da kalıp açısı (15, 30, 45, 60 ve 75 derece) ve ütüleme süresi (0, 10 ve 20 saniye) deney parametreleri olarakbelirlenmiştir. Kaynaklı numunelerde kaynak bölgesindeki ani soğumaya bağlı olarak yüksek miktarda martenzit fazı gözlemlenmiştir.Ancak kaynak gücünün artmasıyla birlikte HSLA yapısındaki karbon ve mangan miktarının az olmasından dolayı sertlik miktarında vegeri esneme açısında azalma meydana gelmiştir. Deneysel çalışmalarda da lazer kaynak gücünün 100 watt artmasıyla geri esnemeaçısının ortalama 0,15 derece azaldığı gözlenmiştir. Kalıp açısındaki 15 dereceden 45 derece açıya kadar olan artışın bükmeoperasyonlarında geri esneme açısını ortalama 0,14 derece arttırdığı, 45 derece açıdan 75 derece açıya kadar artışın bükmeoperasyonlarında geri esneme açısını ortalama 0,52 derece azalttığı gözlemlenmiştir. Ütüleme süresinin 10 saniye artmasıyla geriesneme açısının ortalama 0,14 derece azaldığı belirlenmiştir.

The Experimental Investigation of Springback in Laser Welded HSLA Sheet Materials

In this study, the parameters that affect the springback behavior of HSLA300 sheet materials bonded with laser welding at different power parameters were investigated experimentally. Welding parameters (1300, 1400 and 1500 watts), die angle (15, 30, 45, 60 and 75 degrees) and holding time (0, 10 and 20 seconds) were determined as test parameters. A high amount of martensite phase was observed in welded samples due to sudden cooling in the weld zone. However, as the welding power increased, the amount of carbon and manganese in the HSLA structure was reduced, resulting in a decrease in the hardness amount and the bending angle. In experimental studies, it was observed that the springback angle decreased by 0.15 degrees with an increase of 100 watts of laser welding power. It has been observed that the increase in the die angle from 15 degrees to 45 degrees increases the bending angle in the bending operations by an average of 0.14 degrees. It was determined that the springback angle decreased by 0.14 degrees with an increase of 10 seconds holding time.

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