Welding in the World

http://link.springer.com/journal/40194

List of Papers (Total 56)

Application of FEM simulation method in area of the dynamics of cooling AHSS steel with a complex hybrid welding process

The purpose of this paper is to present the course of a thermal cycle induced by welding in characteristic points in a joint and demonstrate the capabilities of simulation techniques with regard to thermal analysis of welding. Hybrid plasma-arc welding (HPAW) tests were conducted on samples of advanced high-strength steel (AHSS). Welding FEM analysis was carried out. Cooling time...

Analysis of fatigue notch effect due to axial misalignment for ultra high-strength steel butt joints

The majority of fatigue tests of welded specimens is based on shop-made samples generally exhibiting minor misalignment. Due to the challenge of ensuring misalignment-free joints in industrial manufacturing processes, investigations focussing on the effect of misalignment on the fatigue strength are important. Therefore, this paper deals with the influence of axial misalignment...

Influence of the focus wobbling technique on the integrity and the properties of electron beam welded MarBN steel

Martensitic 9–12% chromium steel is a favored material group for critical components in thermal power plants. However, during welding of these steels, a fine-grained zone is formed within the heat-affected zone, which is subject to type IV cracking during creep exposure. Due to the MarBN alloying concept, which is characterized by the controlled addition of boron and nitrogen...

Effect of enhanced cooling on mechanical properties of a multipass welded martensitic steel

The effect of forced cooling using heat sinks on the mechanical properties and interpass waiting time of two-pass welds has been studied for a martensitic steel with a yield strength of 960 MPa when the interpass temperature was 100 °C. Cross-weld tensile and − 40 °C Charpy-V impact toughness properties were examined. The use of heat sinks is shown to result in a beneficial...

Improving the integrity and the microstructural features of electron beam welds of a creep-resistant martensitic steel by local (de-)alloying

Martensitic 9–12% chromium steels present the most preferred material group for high-temperature components in thermal power plants. Previous investigations revealed that due to the use of a creep-resistant martensitic steel strengthened with boron and nitrogen (MarBN), the minimum creep rate can significantly be decreased. Furthermore, the formation of the fine-grained heat...

Influence of three-dimensional weld undercut geometry on fatigue-effective stress

With modern automated welding processes, such as laser-hybrid welding, it is possible to produce high-quality welds with good resistance to fatigue. However, although the overall quality of the weld may be good, the joints can still contain significant geometrical variation and geometrical imperfections at the weld notches. In previous research for thin laser-hybrid welded butt...

Thermo-metallurgically coupled numerical simulation and validation of multi-layer gas metal arc welding of high strength pearlitic rails

A 3D transient thermo-metallurgical finite element simulation of a narrow gap multi-layer gas metal arc welding of the first ten layers of a 60E1 profile and R350HT steel rail was implemented in SYSWELD® to study the evolution of the temperature field, phase fractions, and the hardness in the heat-affected zone. For validation, T (t) curves and metallography samples from...

Influence of inhomogeneity on several length scales on the local mechanical properties in V-alloyed all-weld metal

Recently, a new, vanadium alloyed welding consumable with a minimum yield strength of 1100 MPa was developed. The mechanical properties of welding consumables for gas metal arc welding are usually classified by producing and testing all-weld metal samples, which are typically a multipass weld. Chemical and microstructural fluctuations of a vanadium alloyed all-weld metal sample...

Varestraint weldability testing of cast ATI® 718Plus™—a comparison to cast Alloy 718

Varestraint testing of the newly developed cast ATI® 718Plus™ after pseudo-HIP (hot isostatic pressing) heat treatments showed that the extent of solidification cracking was independent of the heat treatment condition. The susceptibility towards heat-affected zone (HAZ) liquation cracking was found to be related to the heat treatment dwell time rather than the temperature. The...

Investigation of new volumetric non-destructive techniques to characterise additive manufacturing parts

The assessment of the potential of various non-destructive methods to characterise additive manufactured dense and lattice parts was investigated. The Archimedes’ and gas pycnometric methods for density measurements of both types of structures are presented as well as the percentage of cells in lattice structures. A multi-frequency eddy current method for electrical conductivity...

Effect of processing temperatures on the properties of a high-strength steel welded by FSW

The need for weight reduction without compromising load-bearing capacity has driven the development of modern high-strength steels (HSS). The ability to take full advantage of these modern HSS is limited by their weldability. Friction stir welding (FSW) can join HSS at low peak temperatures, better preserving the properties of the base material. This work evaluates the influence...

Determining the BTR by conducting a Trans-Varestraint test using a high-speed camera and two-color pyrometry

The Ni-Fe alloy consumable that applies to the welding of 9% nickel steel for LNG storage tanks is highly susceptible to solidification cracks. To evaluate susceptibilities such as the brittleness temperature range (BTR), a Trans-Varestraint test is generally conducted. However, it is difficult to evaluate the minimum strain value for the BTR and the real temperature at both ends...

Precipitates in microalloyed ultra-high strength weld metal studied by atom probe tomography

Gas metal arc welding with metal-cored filler wires is frequently used to weld high strength steel constructions for lightweight and transportation applications. In the current study, microalloying is considered as strengthening concept for reaching the required mechanical properties by precipitation hardening. For this purpose, the typical microalloying elements Ti, Nb, V, and...

Application of hybrid friction stir channeling technique to improve the cooling efficiency of electronic components

Hybrid friction stir channeling (HFSC) is a new friction stir-based method for producing internal, closed channels created simultaneously during welding of multiple metal plates. Differently from conventional friction stir channeling, that is only able to produce channels in a monolithic component, HFSC can be applied to complex structural systems involving multiple components...

Welding of S960MC with undermatching filler material

High strength structural steels are in high demand thanks to their favorable mechanical properties. They offer high strength with sufficient toughness and good forming capabilities. Applications range from shipbuilding, to offshore constructions, cranes, and pipelines. A lot of current research focuses on weldability of high strength low alloy (HSLA) steels, especially improving...

Wire-based additive manufacturing using an electron beam as heat source

Many standard welding processes, such as gas metal arc-, laser-, or electron-beam welding, can be used for additive manufacturing (AM) with only slight adaptions. Wire-based additive manufacturing provides an interesting alternative to powder-based processes due to their simplicity and comparatively high deposition rates. The use of an electron beam as heat source for AM offers...

Investigation on hot cracking during laser welding by means of experimental and numerical methods

Hot cracking during laser welding of Transformation Induce Plasticity (TRIP) steel at the edges of steel flanges can be a problem. In this study, modified hot cracking tests were performed by welding on a single-side clamped specimen at various distances from the free edge, while the heat input and external constraints remained constant. In situ temperature and strain...

Gas tungsten arc models including the physics of the cathode layer: remaining issues

A recent review pointed out that the existing models for gas tungsten arc coupling the electrode (a cathode) and the plasma are not yet complete enough. Their strength is to predict with good accuracy either the electric potential or the temperature field in the region delimited by the electrode and the workpiece. Their weakness is their poor ability to predict with good accuracy...

Weldability of wrought Haynes® 282® repair welded using manual gas tungsten arc welding

The ability of the precipitation hardening superalloy Haynes® 282® to be repaired by multi-pass gas tungsten arc welding is investigated in this study. The repair welding has been carried out on forged discs having four pre weld heat treatments, resulting in different grain sizes and precipitate structures of the base material. Another set of discs has additionally been put...