溶接学会論文集
Print ISSN : 0288-4771
超微細粒高強度鋼板の大出力レーザ溶接における熱影響部特性
大谷 忠幸塚本 進荒金 吾郎大森 章夫
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2003 年 21 巻 2 号 p. 267-273

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HAZ characteristics of laser welded ultra-fine grained steels were investigated using a 20 kW CO2 laser facility. A narrow softening region was clearly observed in HAZ welded at low welding speed of less than 0.017 m/s. The softening was caused by coarsening of ferrite grains which were heated above Ac1. On the other hand, HAZ softening was suppressed at higher welding speeds of more than 0.033 m/s due to the formation of tiny dispersed MA constituents and reducing grain coarsening. The prior austenite grain size was also examined at various welding speeds. The result indicate that the prior austenite grain size decreased with increasing the welding speed and with decreasing the initial ferrite grain size.

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© 2003 社団法人 溶接学会
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