Laser Hybrid Welding in Stainless Steels and in High Strength Steels

2007 ◽  
pp. 3991-3995 ◽  
Author(s):  
Lars Erik Stridh
Keyword(s):  
Stainless Steels ◽  
High Strength Steels ◽  
High Strength ◽  
Hybrid Welding ◽  
Laser Hybrid Welding ◽  
Laser Hybrid

Laser Hybrid Welding in Stainless Steels and in High Strength Steels

2007 ◽  
Vol 539-543 ◽  
pp. 3991-3995 ◽  
Author(s):  
Lars Erik Stridh
Keyword(s):  
Laser Welding ◽  
Stainless Steels ◽  
High Strength Steels ◽  
High Strength ◽  
Hybrid Welding ◽  
Laser Hybrid Welding ◽  
Welding Head ◽  
Laser Hybrid ◽  
Joint Volume ◽  
Experimental Stage

Laser welding is a well known process, so is GMAW. But the joining of the processes, the so called laser hybrid welding is not that known, yet. Looking into the laser welding we realise, after many years use that there are some limitations to the process. One of the most significant is that the process deals poorly with the ability to bridge gaps between plates that are to be joined. This has its drawbacks on welding economy, the tolerances on ingoing parts has to be very high, the laser process can not tolerate more than 0,1 mm gap between the plates. The GMAW process on the other hand has the ability to deal with the joint tolerances in a better way, the backside is of course the productivity and the penetration properties. In the laser hybrid process where the two processes are joined in the same welding head, we are experienceing a great improvement in several properties. Gaps are no longer a big problem, the process can deal with gaps up to 2,0 mm with the present technology, (it is possible to coop with larger gaps using an oscillation of the laser beam, but this is only on experimental stage yet). This now means that costs for ingoing parts will be reduced. Process stability at high welding speeds is acchived. There are many advantages in high strenght steels that are sensitive to heat input; better mechanical properties are possible to obtain. Looking at the stainless materials the process has many advantages, one of the most important is the joint volume reduction in thicker materials, another is the ability to weld in duplex stainless steels.

scholarly journals Laser hybrid welding of high strength steels

2001 ◽  
Author(s):  
Hans Engström ◽  
Klas Nilsson ◽  
Jan Flinkfeldt ◽  
Tony Nilsson ◽  
Anders Skirfors ◽  
...  
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Hybrid Welding ◽  
Laser Hybrid Welding ◽  
Laser Hybrid

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

Use of Duplex Stainless Steel in Economic Design of a Pressure Vessel

2006 ◽  
Vol 129 (1) ◽  
pp. 155-161 ◽  
Author(s):  
Milan Veljkovic ◽  
Jonas Gozzi
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Stainless Steels ◽  
Pressure Vessel ◽  
Design Procedure ◽  
High Strength Steels ◽  
High Strength ◽  
Pressure Vessels ◽  
Economic Design ◽  
European Standard

Pressure vessels have been used for a long time in various applications in oil, chemical, nuclear, and power industries. Although high-strength steels have been available in the last three decades, there are still some provisions in design codes that preclude a full exploitation of its properties. This was recognized by the European Equipment Industry and an initiative to improve economy and safe use of high-strength steels in the pressure vessel design was expressed in the evaluation report (Szusdziara, S., and McAllista, S., EPERC Report No. (97)005, Nov. 11, 1997). Duplex stainless steel (DSS) has a mixed structure which consists of ferrite and austenite stainless steels, with austenite between 40% and 60%. The current version of the European standard for unfired pressure vessels EN 13445:2002 contains an innovative design procedure based on Finite Element Analysis (FEA), called Design by Analysis-Direct Route (DBA-DR). According to EN 13445:2002 duplex stainless steels should be designed as a ferritic stainless steels. Such statement seems to penalize the DSS grades for the use in unfired pressure vessels (Bocquet, P., and Hukelmann, F., 2001, EPERC Bulletin, No. 5). The aim of this paper is to present an investigation performed by Luleå University of Technology within the ECOPRESS project (2000-2003) (http://www.ecopress.org), indicating possibilities towards economic design of pressure vessels made of the EN 1.4462, designation according to the European standard EN 10088-1 Stainless steels. The results show that FEA with von Mises yield criterion and isotropic hardening describe the material behaviour with a good agreement compared to tests and that 5% principal strain limit is too low and 12% is more appropriate.

Sign in / Sign up

Export Citation Format

Share Document