Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5017722 | Journal of Materials Processing Technology | 2017 | 35 Pages |
Abstract
The objectives of this paper are to measure the absorption rate based on water calorimetric method for both full and partial penetration welding and to evaluate the energy loss by spatter and metallic plume in 6Â kW laser welding of 304 austenitic stainless steel according to the X-ray observed keyhole characteristic and loss of specimen weight. In partial penetration welds of 9Â mm thickness, the absorption rate decreased from 73% to 62% with the welding speed from 50 to 150Â mm/s due to the decrease in multiple reflections of laser beam inside the keyhole. In full penetration welds of 3Â mm thickness, the absorption rate increased from 42% to 61% with the welding speed owing to the decrease in the amount of beam escaped from the keyhole inlet on the bottom surface of the sheet. At 50Â mm/s in full penetration welds, fluctuation in keyhole diameter appeared, and the minimum absorption rate might come near 0 when the keyhole diameter was 3 times of the normal value.
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Authors
Hongze Wang, Motoki Nakanishi, Yosuke Kawahito,