A general high-speed laser drilling method for nonmetal thin material

2013 ◽  
Author(s):  
Zhijian Cai ◽  
Guangsheng Xu ◽  
Zhou Xu ◽  
Zhiqiang Xu
Keyword(s):  
High Speed ◽  
Laser Drilling ◽  
Drilling Method

Evaluation of Residual Stresses in Welded ASTM A36 Structural Steel by Metal Active Gas (MAG) Welding Process

2016 ◽  
Vol 869 ◽  
pp. 567-571 ◽  
Author(s):  
Sandro Rosa Correa ◽  
Marcos Flavio de Campos ◽  
C.J. Marcelo ◽  
José Adilson de Castro ◽  
Maria Cindra Fonseca ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Structural Steel ◽  
High Speed ◽  
Welding Process ◽  
Hole Drilling ◽  
Hole Drilling Method ◽  
Microstructural Parameters ◽  
Drilling Method ◽  
Nondestructive Techniques ◽  
A36 Steel

The use of structural steel in the industry is increasing every day, and the study of stress state after welding has been shown to be of great importance. Nondestructive techniques become quite appropriate to be performed before and during the service component of welded, and thus ensure its integrity. The magnetic technique to be nondestructive, and easy to apply in the field, has potential to be an inspection tool for measuring residual stresses and other microstructural parameters. In this work it was possible to analyze the state of residual stresses through nondestructive techniques, Magnetic Barkhausen Noise and X-ray Diffraction, as well as the semi-destructive technique, high speed hole drilling method, and thereby determine the residual stresses in ASTM A36 steel plate welded by MAG (Metal Active Gas) process.

Cu-Direct Laser Drilling of Blind Via-Hole in Multi-Layer PWBs: Process Visualization Using High-Speed Camera Images

2012 ◽  
Vol 516 ◽  
pp. 30-35 ◽  
Author(s):  
Kuniyoshi Obata ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Keiji Ogawa
Keyword(s):  
High Speed ◽  
Substrate Surface ◽  
Laser Drilling ◽  
Drilling Process ◽  
Positional Accuracy ◽  
Board Density ◽  
Process Visualization ◽  
Direct Laser ◽  
Via Holes ◽  
Direct Drilling

Electrical circuits of Printed Wiring Boards (PWBs) have become multi-layered. Therefore, the formation of micro-blind holes for interlayer electrical connections (blind via holes: BVH) is required. As a result, Cu-direct laser drilling is attracting attention. However, Cu-direct drilling is problematic in that it produces a copper overhang as a result of copper and resin, which have different decomposition points, being melted simultaneously. In addition, the state of PWB surface after the laser drilling is very important. However, this procedure restricts the board density that can be achieved as a result of the limited positional accuracy of the etching process. Consequently, using a Cu-direct drilling process, which does not require etching of the copper foil, to drill BVHs to connect copper foils using a CO2 laser beam has been receiving considerable attention for the next-generation high density PWB manufacturing. However, in the Cu process of generating a direct and overhang problem, there is the problem of accuracy on the substrate surface. In contrast, in-depth research on quality companies has not been performed. Thus, we observe the removal process. Furthermore, we demonstrated reduced overhang.

scholarly journals High Speed EDM and Laser Drilling of Aerospace Alloys

Procedia CIRP ◽  
2016 ◽  
Vol 42 ◽  
pp. 526-531 ◽  
Author(s):  
Mohammad Antar ◽  
Dimitrios Chantzis ◽  
Sundar Marimuthu ◽  
Philip Hayward
Keyword(s):  
High Speed ◽  
Laser Drilling ◽  
Aerospace Alloys

scholarly journals Experimental application of contour method for determination of residual stress in subsurface layers of milled sample

2012 ◽  
Vol 60 (5) ◽  
pp. 79-88
Author(s):  
Karel Horák ◽  
Michal Černý ◽  
Petr Dostál
Keyword(s):  
Residual Stress ◽  
High Speed ◽  
Diffraction Method ◽  
Sample Surface ◽  
Contour Method ◽  
Hole Drilling ◽  
Laboratory Equipment ◽  
Hole Drilling Method ◽  
Drilling Method

Determination of residual stress close to the sample surface is in the most cases performed by hole-drilling method, X-Ray diffraction or neutron diffraction. Each of these methods has its benefits and disadvantages. In case of diffraction methods the measurement speed is the main disadvantage. It is also very problematic to apply diffraction method in case of sample with mechanically deformed surface, for example by standard machining operations. Therefore, determined results are very often confusing and hard to interpret. On the other side, hole drilling method is less sensitive to quality of sample surface than diffraction methods, but measurement realization is quite expensive and equipment demanding (strain gage rosettes, miniature milling cutter, high speed milling machine, pc equipment,…).Recently introduce contour method used for determination of residual stress inside the sample is very fast, can be performed with almost common laboratory equipment and combines traditional stance with modern numerical methods by FEM. Contour method was selected for determination of residual stress below the milled surface and the dependency of milling process quality on residual stress value is demonstrated.

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