Assessment of different laser hybrid welding processes

2008 ◽  
Author(s):  
Paul Kah ◽  
Antti Salminen ◽  
Jukka Martikainen
Keyword(s):  
Hybrid Welding ◽  
Laser Hybrid Welding ◽  
Laser Hybrid ◽  
Welding Processes

Laser Hybrid Welding Processing of Mg-Rare Earth Alloy

2011 ◽  
Vol 311-313 ◽  
pp. 2367-2370
Author(s):  
Jun Dai ◽  
Jian Huang ◽  
Zhu Guo Li ◽  
Jie Dong
Keyword(s):  
Rare Earth ◽  
Welded Joints ◽  
High Speed ◽  
Hybrid Welding ◽  
Rare Earth Alloy ◽  
Welding Method ◽  
Gas Tungsten Arc ◽  
Laser Hybrid Welding ◽  
Laser Hybrid ◽  
Welding Processes

The welding processing of Mg-rare earth alloy NZ30K was studied using laser-TIG hybrid welding. For comparison the NZ30K alloy was also welded by the gas tungsten arc (TIG) and laser beam respectively. The microstructure of the welded joints had been analyzed. The hybrid welding method could refine the grains in the fusion and improve the tensile strength of the welded joints obviously. The arc plasma and the laser-induced plasma during welding were recorded by a high speed camera and the area of the plasma was calculated through image processing technology. Among the three welding processes the plasma area of the hybrid welding is the largest, but not a simple addition of the TIG welding and laser welding. The results show that Mg-rare earth alloy NZ30K can be well joined using the laser-TIG hybrid welding method.

Indian Test Blanket Module in ITER - Development of RAFM Steel and Fabrication Technology

2014 ◽  
Vol 94 ◽  
pp. 1-11 ◽  
Author(s):  
Tammana Jayakumar ◽  
Ellappan Rajendra Kumar
Keyword(s):  
Hot Isostatic Pressing ◽  
Physical And Mechanical Properties ◽  
Bottom Plate ◽  
Hybrid Welding ◽  
First Wall ◽  
Back Plate ◽  
Laser Hybrid Welding ◽  
Laser Hybrid ◽  
Rafm Steel ◽  
Welding Processes

A detailed and comprehensive programme is undertaken in India to fabricate Indian Test Blanket Module (TBM) to be tested in ITER. Development of India-specific Reduced Activation Ferritic/Martensitic (RAFM) steel has been realized through melting and physical and mechanical properties characterization of several heats of 9Cr-RAFM steel with varying tungsten and tantalum contents. The RAFM steel having 1.4 wt. % tungsten and 0.06 wt. % tantalum is found to possess better combination of strength and toughness and is considered as India-specific RAFM steel. Different joining processes for fabrication of TBM have been assessed. Hot Isostatic Pressing (HIP) has been demonstrated to fabricate the first wall of TBM. To avoid channel collapse during HIPing, leachable ceramic cores were inserted in the channels. Electron Beam (EB) and Laser Welding processes are used for fabrication of breeder cassettes and hence, these welding procedures have been developed. Tungsten Inert Gas (TIG), Narrow Gap TIG (NG-TIG) and Laser Hybrid welding processes are being considered for integration of the various components such as first wall, back plate, bottom plate, breeder assembly and flow dividers into TBM. RAFM steel welding consumables have also been developed and qualified. Procedure for laser hybrid welding has also been developed. Necessary technologies for inspection and quality assurance of the fabricated TBM are also being developed. Use of ultrasonic C-Scan imaging to examine the bond integrity of the HIP joint has been demonstrated. Phased Array technique that would enable inspection of welds by longitudinal movement of the probe from an optimised lateral distance of the weld without the requirement of lateral movement has also been developed. The challenges in developing the India-specific RAFM steel and the fabrication and inspection technologies for fabrication of Indian TBM are presented.

Laser Hybrid Welding of Advanced High Strength Steels (AHSS) for Automotive Body Construction

2007 ◽  
Author(s):  
Ramakrishna Koganti ◽  
Sergio Angotti ◽  
Armando Joaquin ◽  
Eric Stiles
Keyword(s):  
Mild Steel ◽  
Light Source ◽  
Welding Process ◽  
High Strength Steels ◽  
High Strength ◽  
Hybrid Welding ◽  
Advanced High Strength Steels ◽  
Laser Hybrid Welding ◽  
Laser Hybrid ◽  
Welding Processes

In response to demands for improved safety standards and fuel economy, automotive OEMs have shown an increased interest for using light weight materials with greater strength. Advanced High Strength Steels (AHSS) have gained popularity due to their superior mechanical properties and weight advantages, as compared to mild steel materials. Welding of AHSS materials remains one of the technical challenges in the successful application of AHSS in automobile structures, especially when durability of the welded structures is required. Currently, various fusion welding processes such as Metal Inert Gas (MIG), Laser and Laser Hybrid are used on mild steel applications. The Laser and Laser Hybrid weld processes continue to gain popularity in automotive applications due to their ability to provide structural integrity and manufacturing efficiency. In laser welding, only a light source is used to join materials together. In laser hybrid, both a light source and metal filler are used to join the materials. In this paper, the laser hybrid joining process on AHSS materials (DP780 and Boron) is investigated. Influence of heat from Laser Hybrid welding process and its effect on the steel is discussed.

scholarly journals GMA-laser Hybrid Welding of High-strength Fine-grain Structural Steel with an Inductive Preheating

2014 ◽  
Vol 56 ◽  
pp. 637-645 ◽  
Author(s):  
Rabi Lahdo ◽  
Oliver Seffer ◽  
André Springer ◽  
Stefan Kaierle ◽  
Ludger Overmeyer
Keyword(s):  
Structural Steel ◽  
High Strength ◽  
Hybrid Welding ◽  
Fine Grain ◽  
Laser Hybrid Welding ◽  
Laser Hybrid

Austenite Decomposition Kinetics in Laser-Hybrid Welding of Steel of Strength Class K52

2019 ◽  
Vol 946 ◽  
pp. 950-955 ◽  
Author(s):  
A.I. Romantsov ◽  
M.A. Fedorov ◽  
D.G. Lodkov
Keyword(s):  
Welded Joints ◽  
Strength Class ◽  
Defect Formation ◽  
Welding Process ◽  
Decomposition Kinetics ◽  
Hybrid Welding ◽  
Austenite Decomposition ◽  
Laser Hybrid Welding ◽  
Laser Hybrid ◽  
The Impact

A modern technology for joining materials welding is commonly used in various industries. It is a process of interaction of thermal, mechanical and metallurgical properties and behaviors. Complex phenomena, such as solidification, microstructural changes and defect formation, have a great impact on the quality of welded joints. This article presents the results of studying the features of the austenite decomposition kinetics in the application of laser-hybrid welding technology, in a combination with multi-arc automatic submerged arc welding. The cooling rates are determined, affecting the change in properties of HAZ of welded joints on pipe steel of strength class K52. Using the dilatometric method, studies were conducted and thermo-kinetic and structural diagrams were constructed. Analysis of diagrams and microstructures showed that, as a result of the impact of the laser-hybrid welding process in the area of HAZ, the decomposition of austenite occurs mainly in the martensitic zone, followed by the formation of a bainite-perlite structure, due to recrystallization from the heat generated by the facing seams.

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