ОСОБЕННОСТИ ПРОЦЕССА ЛАЗЕРНОЙ СВАРКИ РАЗНОРОДНЫХ МАТЕРИАЛОВ НА ЖЕЛЕЗНОЙ И МЕДНО-НИКЕЛЕВОЙ ОСНОВЕ PECULIAR FEATURES OF LASER WELDING PROCESS FOR DISSIMILAR MATERIALS ON FERRUM OR COPPER-NICKEL BASE (original) (raw)

A Study on Behavior of Materials Under The Influence of Laser Joining

IJRAME PUBLICATIONS, 2022

Laser welding will be an important welding process for different applications in aerospace , aircraft , automotive, electronics and other industries, due to its capabilities like minimum heat affected zone, welding of various thicknesses, adoptability to welding of various materials possessing widely varying physical properties like melting point, absorption, reflectivity etc. It utilizes laser source as a non contact heat generation technology to weld different materials so as to achieve welds of high quality narrow width and high penetration depths without the need of filler wires. It may be necessary to understand the effect of process parameters on the weldability of materials for successful welding. Laser welding popularly uses two types of lasers like CO2 and Nd:YAG (neodymium doped yttrium – aluminium – garnet) with different powers. Nd:YAG lasers are used to weld materials of different thicknesses involving powers upto 5 kW. Whereas, CO2 lasers are used for applications which involve higher powers upto 20 kW. Laser welding allows a direct transition from light energy into heat energy. This technique is involved with the process of laser - matter interaction in which various parameters such as pulse energy, pulse duration, spot size, welding speed, laser power, weld width, penetration depth, reflectivity, absorption coefficient, thermodynamic properties etc. are used for analysis. This paper presents a review of the different parameters including process as well as materials on the weldability of various materials like carbon steels, stainless steels, magnesium alloys, aluminium alloys, refractory materials such as vanadium, titanium, zirconium, tantalum etc. The selection of appropriate parameter for welding of specified material is discussed. The prominent weld defects common to the laser welding such as porosity, oxide inclusions, cracking, loss of alloying elements etc., are discussed as related to the microstructure as well as mechanical properties such as hardness, tensile strength and fatigue strength etc.

Research Developments in Laser Welding -A Review

Laser welding is considered as a sophisticated, high precision and high speed joining process. In this process, laser beam is used as a heat source to join variety of materials such as aluminum, titanium, carbon steels, HSLA steels and stainless steels etc. Laser welding is currently being utilized in joining of miniature electronic components, steel structures, engine parts, transmission parts, alternators, solenoids, fuel injectors, fuel filters, air conditioning equipment and air bags etc. The present research paper discusses the recent research developments, process parameters, optimization techniques and applications of laser welding.

Analysis and Advantages of Welding Dissimilar Metals by Fiber Lasers

Welding of two dissimilar metals is the requirement projected by many industries for getting stronger, lighter, more efficient and cost-effective combined alloys. It is required in the new design of lighter, fuel efficient and environment-friendly automobiles. Similarly aerospace industry, electronics industry and medical industry require the welded dissimilar metals for various advantageous reasons. But there are many difficulties in welding dissimilar metals whose physical and chemical properties are far too different from each others'. There are stresses, porosity and cracks developed in such welding process. One of the solutions is the use of lasers to perform such welding. Out of many lasers, continuous wave (cw) and pulsed fiber lasers have proven to perform this task more efficiently than other lasers. To avoid the formation of inter-metallic compounds during welding of dissimilar metals, one of the many techniques is the use of suitable filler metal or filler wire. The details of these aspects are discussed in the present paper.

The impact of laser welding parameters on the mechanical properties of the weld

This paper discusses the effect of selected parameters of laser welding on the mechanical properties of welds. Two parameters were analysed: the welding speed and the laser power. The properties of the material in the fusion zone and the heat affected zone were determined by performing static tensile tests, hardness tests and microscopic analysis. The welding was carried out using a TRUMPF Lasercell 1005 CO2 laser (wavelength =10.6 m). The specimens were 0.8 mm in thickness and they were made of DC04 steel. The static tensile tests were conducted by means of a LabTest 5.20SP1 universal testing machine designed to determine the tensile and compressive strengths. The material hardness was measured with a NEXUS 4304 Vickers hardness tester. The microscopic analysis was performed with a Joel JSM-5400 scanning electron microscope. The results indicate that welds produced at different welding parameters have similar mechanical properties.

Investigation into properties of laser welded similar and dissimilar steel joints

Science and Technology of Welding and Joining, 1998

and narrow heat affected zone (HAZ) development compared to conventional fusion welding processes.! Despite the high investment cost of laser welding equipment, it is expected that laser welding will have a great impact on fabrication and manufacturing industries for the welding of medium section steel structures within the next decade. 2 However, the significance of the metallurgical and mechanical properties of LB welds combined with the unique shape of the weld joint still needs to be established for structural components.

Experimental Study of the Technology Parameters Affect in the Laser Welded Joints

IOP Conference Series: Materials Science and Engineering, 2019

The laser welding technology is improving immediately rapidly nowadays. It has many advantages again the traditional welding technologies. The heat affected zone in case of the laser welding is very thin and the penetration of the joint is depth. This high energy technology work by a focused high energy laser light accompanied by protective gases. For welding process well known the different laser devices (gas laser, solid-state laser, disc laser). The effect of the gases and the technological parameters are not well known yet. In this work, we wanted to find some relationship between the welding parameters and the joint mechanical properties. To find this relationship it was welded the joint by different technologies parameters and the samples experimented the joint mechanical properties with different parameters and controlled by the experimental way.

Analysis of the Laser Welding Process

Biuletyn Instytutu Spawalnictwa

The article discusses the basics of keyhole welding, melt-in welding, hybrid laser welding (laser + GMA) and laser welding with filler metal feeding as well as presents laser welding process applications in various industries. In addition, the article discusses advantages and disadvantages of laser welding as well as presents typical laser welding-related imperfections and possibilities of the real-time monitoring of laser welding process quality.

Fibre Laser Welding of HY-80 Steel: Procedure Development and Testing

2010

Calvin Hyatt Chair DRP © Her Majesty the Queen in Right of Canada, as represented by the Minister of National Defence, 2010 © Sa Majesté la Reine (en droit du Canada), telle que représentée par le ministre de la Défense nationale, 2010 DRDC Atlantic TM 2009-187 i Abstract ……..