Weld Pool Shaping and Microstructural Control Using Novel Computer Generated Holographic Optic Laser Welding of Steel and Stainless Steel
Weld Pool Shaping and Microstructural Control Using Novel Computer Generated Holographic Optic Laser Welding of Steel and Stainless Steel
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使用新型计算机生成的全息光学激光焊接钢和不锈钢的焊池成形和微观结构控制
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发表时间：
2010
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通讯作者：
J. Tyrer
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作者：
R. Higginson;M. Gibson;J. Kell;J. Tyrer
这项工作考虑使用全息光学元件（HOE）来成形焊缝和控制焊缝的微观结构。研究的光束轮廓是由HOE产生的标准高斯和偏移橄榄球柱。采用不同的能量密度，通过引入镍合金填充粉末，在普通碳钢上进行了自焊焊接。横截面的焊缝已被分析的焊缝轮廓，焊接熔池形状，热影响区和程度的存款/基板混合。电子背散射衍射（EBSD）结合能量色散X射线光谱（EDS）已被用来研究开发的微观结构。结果表明，通过利用HOE的熔池形状可以修改，以便可以获得更方的轮廓。可以控制焊池内的晶粒结构，使得当与用高斯光束观察到的粗柱状晶粒相比时，可以形成更细的更等轴的晶粒结构，其中HAZ中的微观结构具有显著差异。
This work considers the use of Holographic Optical Elements (HOEs) to shape the weld beam and control the microstructure of the weld bead. The beam profiles investigated are a standard Gaussian and an Offset Rugby Post produced by a HOE. Autogenous welds have been produced on plain carbon steel with the introduction of a nickel alloy filler powder, using different energy densities. Cross sections of the welds have been analysed in terms of the weld profile, weld pool shape, HAZ and the extent of the deposit/substrate mixing. Electron BackScatter Diffraction (EBSD) coupled with Energy Dispersive X-ray Spectroscopy (EDS) has been used to study the microstructures developed. The results have shown that by utilising HOE’s the weld pool shape can be modified so that a squarer profile can be obtained. The grain structure within the weld pool can be controlled such that a finer more equiaxed grain structure can be developed when compared with the coarse columnar grains seen with a Gaussian beam with a marked difference in the microstructures in the HAZ.