International Congress on Laser Advanced Materials Processing最新文献

Quality control using statistical evaluation of melt area in laser welding of aluminum alloy 铝合金激光焊接熔面积统计评价的质量控制

International Congress on Laser Advanced Materials Processing Pub Date : 2003-03-03 DOI: 10.1117/12.497786

Jonas Kooki Tazuke, Takehiro Watanabe, S. Matsusaka

引用次数: 0

Tracking and inspection for laser welding 激光焊接的跟踪和检验

International Congress on Laser Advanced Materials Processing Pub Date : 2003-03-03 DOI: 10.1117/12.486498

J. Boillot, K. Uota, E. Berthiaume, J. Noruk

引用次数: 2

High power diode lasers: technology and application in Europe 高功率二极管激光器:欧洲的技术与应用

International Congress on Laser Advanced Materials Processing Pub Date : 2003-03-03 DOI: 10.1117/12.497970

M. Behringer, F. Eberhard, G. Herrmann, J. Luft, J. Maric, S. Morgott, M. Philippens, W. Teich

引用次数: 11

Laser microprocessing of wide bandgap materials 宽禁带材料的激光微加工

International Congress on Laser Advanced Materials Processing Pub Date : 2003-03-03 DOI: 10.1117/12.486496

I. Salama, N. Quick, A. Kar

{"title":"Laser microprocessing of wide bandgap materials","authors":"I. Salama, N. Quick, A. Kar","doi":"10.1117/12.486496","DOIUrl":"https://doi.org/10.1117/12.486496","url":null,"abstract":"Laser direct-write and doping technique (LDWD) is used to introduce variations in electric properties of wide band gap materials such as SiC and diamond. Conductive, p-type doped, n-type doped and insulative tracks are created on different diamond and SiC substrates using this method. The effects of various processing parameters such as laser-matter interaction time, number of repeated exposures, and type of irradiation environment are investigated. SEM, SIMS, XPS and Raman spectroscopy are used to study the effect of laser irradiation on the microstructure, chemical binding and to obtain dopant depth profile in the substrates, respectively. LDWD technique proved to enhance the dopant (nitrogen) diffusivity into SiC resulted in a diffusion coefficient (available in paper)that is four orders of magnitudes faster than the reported value (5 x 10-12 cm2s-1). Process modeling is conducted to study the atomistic of laser-doping process and to utilize laser irradiation to increase both dopant penetration and concentration. Laser doping of nitrogen alters the Raman spectrum of the 4H-SiC suggesting that Raman spectroscopy can be used as a non-contact method to characterize the laser-doped SiC.","PeriodicalId":159280,"journal":{"name":"International Congress on Laser Advanced Materials Processing","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116372909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Laser surface annealing technique of aged Inconel 718 by laser beam irradiation 时效Inconel 718激光表面退火技术

International Congress on Laser Advanced Materials Processing Pub Date : 2003-03-03 DOI: 10.1117/12.497895

Liufa Liu, A. Hirose, K. Kobayashi

{"title":"Laser surface annealing technique of aged Inconel 718 by laser beam irradiation","authors":"Liufa Liu, A. Hirose, K. Kobayashi","doi":"10.1117/12.497895","DOIUrl":"https://doi.org/10.1117/12.497895","url":null,"abstract":"Laser was employed to anneal a thin surface layer of aged Inconel 718 by dissolving the strengthening phase, γ\". The HE (Hydrogen Embrittlement) resistance of the alloy was improved via such laser surface annealing (LSA) processes. To establish a general LSA technique for engineer applications, experimental LSA processes were conducted to study the effects of the laser process parameters on the formation of the annealed surface layers, and applicable process parameter ranges were obtained. Next, a numerical method was developed for predicting the formation of the laser annealed surface layers in the following steps. Because only the γ\" phase was dissolved in the LSA process, the dissolution kinetics of this phase was studied via thermal cycling experiments, and it was proved to follow an Avrami equation. FEM (Finite Element Method) simulations were conducted to calculate the thermal distribution in each laser annealed surface layer, and thermal history data were extracted every certain depth. The volume fractions of the γ\" phase at these depths were calculated using these thermal history data based on the deduced Avrami equation. Using a developed relationship between the hardness variation of the alloy and the volume fraction variation of the γ\" phase, the hardness distribution in the annealed surface layer and this layer's thickness were calculated. The predicted applicable laser process parameter ranges were obtained. These calculated results were compared with their corresponding experimental results. The good agreements between the calculated and measured results suggested that this numerical prediction approach is feasible for engineer applications.","PeriodicalId":159280,"journal":{"name":"International Congress on Laser Advanced Materials Processing","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121942297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CO2 and Nd:YAG laser cladding using Stellite 6 采用钨铬钴合金6进行CO2和Nd:YAG激光熔覆

International Congress on Laser Advanced Materials Processing Pub Date : 2003-03-03 DOI: 10.1117/12.497603

A. Jansson, J. Ion, V. Kujanpaeae

引用次数: 1

Development of high-brightness diode lasers: the z-laser 高亮度二极管激光器的发展:z激光器

International Congress on Laser Advanced Materials Processing Pub Date : 2003-03-03 DOI: 10.1117/12.497968

K. Boucke, J. Rogg, R. Poprawe

{"title":"Development of high-brightness diode lasers: the z-laser","authors":"K. Boucke, J. Rogg, R. Poprawe","doi":"10.1117/12.497968","DOIUrl":"https://doi.org/10.1117/12.497968","url":null,"abstract":"During the recent years the performance of high power diode lasers in terms of output power and lifetime has increased significantly. However, for many applications not only a high output power but also a good beam quality is necessary -- in other terms, high brightness is required. While the beam quality of classical broad area-type high power diode lasers is poor, special laser structures have been developed to achieve an improved beam quality. Examples are the tapered laser, the alpha-DFB-laser and -- the latest development -- the so-called \"z-laser.\" The z-laser uses internal total reflection for the suppression of higher-order modes. The effectiveness of this working principle was first demonstrated by performing extensive numerical simulations. During the last year the first z-laser structures have been processed and characterized. The experimental results of these first test lasers are compared with the predictions from the numerical simulations and show a very good agreement. With these first lasers, approximately 500 mW output power at 6-times diffraction limited beam quality have been demonstrated. Nevertheless, there are also some not well understood features of the z-laser to be investigated, like a reduced conversion efficiency and untypical characteristic curves showing kinks. Understanding these features, demonstrating the reproducibility of the structure and further performance improvements are the goals of current rsearch.","PeriodicalId":159280,"journal":{"name":"International Congress on Laser Advanced Materials Processing","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115012840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Establishment of a model predicting tensile shear strength and fracture portion of laser-welded lap joints 建立了激光搭接接头抗拉剪切强度及断裂部位预测模型

International Congress on Laser Advanced Materials Processing Pub Date : 2003-03-03 DOI: 10.1117/12.486493

S. Furusako, Y. Miyazaki, K. Hashimoto, J. Kobayashi

{"title":"Establishment of a model predicting tensile shear strength and fracture portion of laser-welded lap joints","authors":"S. Furusako, Y. Miyazaki, K. Hashimoto, J. Kobayashi","doi":"10.1117/12.486493","DOIUrl":"https://doi.org/10.1117/12.486493","url":null,"abstract":"This study was aimed at establishment of a model that can predict tensile shear strength and fracture portion laser-welded lap joints in the tensile test. To clear influence of the bead length and width on them, the joints employed steel sheets with a thickness in the range of 0.8 mm to 1.2 mm were evaluated. It was found that the tensile shear strength increased with the bead size, and the fracture occurred at base metal (BM), weld metal (WM) or portion between them with a curvature (referred to as portion R). Also to clarify rotational deformation process around WM during the tensile test, joint cross-sections were observed at some applied load levels in the test. This observation derived the relationship between the radius, Ri, at the inner plane of portion R and the rotational angle, θ, of the center of sheet thickness, and the relationship between Ri and applied load. A plastic analysis based on these functions and assumptions that the joint consists of BM, WM and R, which are under simplified stress mode respectively, could estimate the tensile shear strength and the fracture portion of the joints. This estimation made good accord with experimental results.","PeriodicalId":159280,"journal":{"name":"International Congress on Laser Advanced Materials Processing","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123731386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Development of numerical simulation technique for laser welding 激光焊接数值模拟技术的发展

International Congress on Laser Advanced Materials Processing Pub Date : 2003-03-03 DOI: 10.1117/12.497910

N. Takahashi, S. Fujii, K. Yasuda

{"title":"Development of numerical simulation technique for laser welding","authors":"N. Takahashi, S. Fujii, K. Yasuda","doi":"10.1117/12.497910","DOIUrl":"https://doi.org/10.1117/12.497910","url":null,"abstract":"We have been developing numerical simulation technique for laser welding. This study present some results obtained recently on the improvements of simulation models and numerical procedures, experimental data for code validation and the results of comparison of experiments with numerical analysis. We added the surface evaporation model under boiling temperature and introduced the level-set method as accurate and low numerical diffusion tracking procedure. We extend our gas phase model as enable to treat multi species of gas and mutual diffusion process. Two kinds of experiment were carried out in this study for code validation. One is the experiment to observe the surface tension driven convective flow and the other is to confirm the threshold of laser power density to form the keyhole. In these experiments, 6 kW YAG laser is used in CW mode and test pieces of aluminum alloy A1050P are irradiated in an inert atmospheric box. We calculated the heat conduction type of welding using improved code based on the actual welding conditions including the surface tension and surface evaporating models. And we simulated a series of transient behavior of molten pool irradiated by high laser power density.","PeriodicalId":159280,"journal":{"name":"International Congress on Laser Advanced Materials Processing","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129631252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improvement of laser beam welding by electromagnetic forces in the weld pool 焊接池中电磁力对激光束焊接的改进

International Congress on Laser Advanced Materials Processing Pub Date : 2003-03-03 DOI: 10.1117/12.497920

Guenter Ambrosy, P. Berger, H. Huegel, D. Lindenau

引用次数: 4