CAJ | 학술논문

利用激光焊接工艺焊接核级不锈钢，通过改变激光焊接速度得到不同的焊接接头。采用金相显微镜、扫描电子显微镜等手段研究了熔深比、δ/γ比、组织形貌以及焊缝中各相的成分。通过显微硬度测试了焊缝接头上硬度分布。随着焊接速度的增加，焊缝熔深比线性增加，焊缝中啄-铁素体含量增加，岛状组织增多，板条状组织增多，蠕虫状组织减少，焊缝区的平均硬度值增加。
이용격광한접공예한접핵급불수강，통과개변격광한접속도득도불동적한접접두。채용금상현미경、소묘전자현미경등수단연구료용심비、δ/γ비、조직형모이급한봉중각상적성분。통과현미경도측시료한봉접두상경도분포。수착한접속도적증가，한봉용심비선성증가，한봉중탁-철소체함량증가，도상조직증다，판조상조직증다，연충상조직감소，한봉구적평균경도치증가。
ABSTRACT Nuclear grade stainless steel welding joints were prepared by laser beam welding ( LBW) at different welding speeds. Optical microscopy and scanning electron microscopy were subsequently used to study the weld penetration ratio, δ/γ ratio, micro-structure, and phase composition. The hardness distribution was examined with a micro-Vickers hardness tester. When this welding speeds up, the weld penetration ratio and δ-ferrite content within the welding seam increase, the island and lath-shaped microstruc-tures enlarge at the cost of the worm-like one, and the average hardness value in the weld area becomes greater.