Wyniki wyszukiwania - BazTech

1

Investigation and characterization of hardening of AISI 4140 steel using Nd:YAG laser

Cinar O., Mackan N. M., Gulluoglu A. N.

Archives of Materials Science and Engineering

|

2014

|

Vol. 65, nr 1

32--36

EN

Purpose: In this research, our aim was to propose an alternative to the conventional hardening methods, laser spot welding, thus laser hardening through the solid state reaction. Design/methodology/approach: Instead of diode lasers, the Neodymium:YAG Laser was used by applying different voltage, time and depths of laser and the parameters of hardening and the differences induced in the hardness’s of the specimens were investigated. Findings: The hardness of the specimens depending on the depths laser, from the edge to the deep of the specimens were measured. The metallographic examination (transformation due to the heating-cooling cycles) and the SEM analysis was made to complete the characterization. Research limitations/implications: Using Nd:YAG laser, the hardening process was easy to operate offering several advantages such as possibility of working in very small and narrow areas altering the voltage and depths of laser facilely and obtaining high hardness values due to transformation of microstructure without need of secondary quenchant. Originality/value: In this work, an alternative to the conventional hardening methods, laser spot welding was applied to AISI 4140 steel surface, which is widely used in the industry, thus laser hardening through the solid state reaction was achieved.

2

Laser welding of laminated electrical steel structures

Markovits T.

International Journal of Applied Mechanics and Engineering

|

2010

|

Vol. 15, no 2

497-502

EN

Electric motor components consist of laminated electrical steels. These separated sheets need fixture to create a bulk construction. Welding is one of the appropriate fastening processes, which are used for fixing the separated sheets by diffusion bonding. Besides the conventional welding methods, laser welding is an alternative technology which ensures further advantages. The well controllable laser process offers the possibility to create the necessary weld bead geometry. In this research work, laser welding of laminated electrical steel was investigated with Nd:YAG laser source. There is a lot of choice to get the proper laser equipment. In this paper, we investigated the parameter of the pulsed laser beam and the weldability of laminated electrical steel.

3

Obliczenia teoretyczne kształtu laserowej spoiny punktowej

Grabas B., Mazur E.

Przegląd Elektrotechniczny

|

2008

|

R. 84, nr 7

126-128

PL

W obecnej pracy modelowano profile spoin punktowych uzyskanych z głębokiego spawania laserowego płaskiego detalu ze stali węglowej C48 za pomocą pół-analitycznego kondukcyjnego medelu rozwiązanego metodą Funkcji Green’a. W celu otrzymania profili spawu bardzej odpowiadających profilom rzeczywistym, stacjonarne źródło ciepła w modelu jest tłumione eksponencjalnie zgodnie z prawem Beer’a-Lambert’a. Wyniki obliczeń były porównane z wynikami eksperymentalnymi.

EN

Profiles of joints resulting from laser beam spot welding of a flat workpiece of carbon steel were computed. A semi-analytical conduction model solved with Green’s function method was used in computations. In the model, the fixed heat source was attenuated exponentially in accordance with Beer-Lambert law. Computational results were compared with those in the experiment.