نتایج جستجو برای: laser welding

تعداد نتایج: 196549  

F. Nematzadeh H. Mostaan,

In the present work, a high power Nd:YAG laser has been employed to weld AISI 430 ferritic stainless steel thin sheets. Optical microscopy was used to study the microstructural evolutions during laser welding. Tensile test and microhardness measurement were employed in order to investigate the mechanical behaviors of welds. Also, vibrational sample magnetometry was used for characterizing magne...

2017
Baohua Chang Zhang Yuan Haitao Pu Haigang Li Hao Cheng Dong Du Jiguo Shan

To obtain satisfactory welds in positional laser beam welding, it is necessary to know how process parameters will influence the quality of welds in different welding positions. In this study, the titanium alloy Ti6Al4V sheets were laser welded in two vertical welding positions (vertical up and vertical down), and the appearance, porosity, strength, and ductility of the laser joints were evalua...

Journal: :journal of modern processes in manufacturing and production 0
mahmoud moradi department of mechanical engineering, faculty of engineering, malayer university, malayer, iran majid ghoreishi faculty of mechanical engineering, k.n. toosi university of technology, tehran, iran azam rahmani faculty of mechanical engineering, k.n. toosi university of technology, tehran, iran

in this paper, a three-dimensional finite element model has been developed to simulate the laser-tig hybrid welding (hlaw) of stainless steel 1.4418 with thickness of 4 mm. transient temperature profile and dimensions of the fusion zone and heat affected zone (haz) during welding process are calculatedusing finite element method (fem) and were solved in the abaqus/standard software.the heat sou...

2017
Xiao Wang Yapeng Luo Tao Huang Huixia Liu

Recently, amorphous alloys have attracted many researchers' attention for amorphous structures and excellent properties. However, the welding of amorphous alloys to traditional metals in the microscale is not easy to realize in the process with amorphous structures unchanged, which restrains the application in industry. In this paper, a new method of welding Fe-based amorphous alloys (GB1K101) ...

2008
Jens Johannes Bock Jacqueline Bailly Christian Ralf Gernhardt Robert Andreas Werner Fuhrmann

The aim of this study was to compare the mechanical strength of different joints made by conventional brazing, TIG and laser welding with and without filling material. Five standardized joining configurations of orthodontic wire in spring hard quality were used: round, cross, 3 mm length, 9 mm length and 7 mm to orthodontic band. The joints were made by five different methods: brazing, tungsten...

2012
N. SIVA SHANMUGAM G. BUVANASHEKARAN K. SANKARANARAYANASAMY

Laser beam welding (LBW) is one of the most important manufacturing processes used for joining of materials. It is also a remarkably complicated, nonlinear operation involving extremely high temperatures. Since its invention more than two decades ago, laser beam welding has been more of an art than a science. Laser welding of austenitic stainless steel AISI 304 the candidate material of this re...

2012
Zhiguo Gao

A two-dimensional thermal elasto-plastic numerical model is developed by finite element method to analyze and compare the mechanical driving factor for heat affected zone (HAZ) liquation cracking during laser welding and hybrid laser-arc welding techniques. Calculations of transient temperatures and cooling rates are used in conjunction with solidification theory to analyze weld pool characteri...

Journal: :Optimization Methods and Software 2014
Jörg Rambau Cornelius Schwarz

We investigate the problem of dispatching arc welding robots in car body manufacturing. Such arc welding robots receive their energy from expensive laser sources. Laser sources can be shared among the robots. However, this requires that the robots are scheduled because each laser source can only be used by one robot at a time. We want to compute the minimal number of laser sources necessary to ...

2017

Lasers have been employed in a variety of welding applications for many years. And, as laser technology further develops and diversifies, its uses in welding continue to expand. This article provides an overview of high power lasers in keyhole welding. It then examines the characteristics and advantages of fiber laser sources for welding from Coherent | Rofin, in particular, and review a specif...

2002
A. Bollig

Welding with laser beams is an innovative technique, which is leads to higher penetration depth and a narrower seam compared to conventional welding techniques. One significant criterion of the quality of a junction is the penetration depth. Within this article a predictive control scheme is presented that optimises the process input laser power by taking the future welding speed into account. ...

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