Characteristics of deep penetration laser welding of dissimilar metal Ni-based cast superalloy K418 and alloy steel 42CrMo

被引：39

作者：

Liu, Xiu-Bo

Pang, Ming

Zhang, Zhen-Guo

Ning, Wei-Jian

Zheng, Cal-Yun

Yu, Gang

机构：

[1] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China

[2] Zhongyuan Inst Technol, Sch Mat & Chem Engn, Zhengzhou, Henan Province, Peoples R China

来源：

OPTICS AND LASERS IN ENGINEERING | 2007年 / 45卷 / 09期

基金：

中国博士后科学基金;

关键词：

laser processing; metals and alloys; welded seam; ND-YAG LASER; ALUMINUM;

D O I：

10.1016/j.optlaseng.2007.03.004

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Experimental trials of autogenous deep penetration welding between dissimilar cast Ni-based superalloy K418 and alloy steel 42CrMo flat plates with 5.0 mm thickness were conducted using a 3 kW continuous wave (CW) Nd:YAG laser. The influences of laser output power, welding velocity and defocusing distance on the morphology, welding depth and width as well as quality of the welded seam were investigated. Results show that full keyhole welding is not formed on both K4.18 and 42CrMo side, simultaneously, due to the relatively low output power. Partial fusion is observed on the welded seam near 42CrMo side because of the large disparity of thermal-physical and high-temperature mechanical properties of these two materials. Tile rnicrohardness of the laser-welded joint was also examined and analyzed. It is suggested that applying negative defocusing in the range of Raylei length can increase the welding depth and improve tile coupling efficiency of the laser materials interaction. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：929 / 934

页数：6

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