“Structure and characteristics of thin sheet laser welded joints of nitrogen content austenitic and martensitic steels”

2014 ◽  
Author(s):  
M.V. Kostina ◽  
S.O. Muradjan ◽  
E.V. Blinov ◽  
Yu. Petrov ◽  
S.D. Voronchuk ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Welded Joints ◽  
Thin Sheet ◽  
Martensitic Steels

scholarly journals Properties of Welded Joints on Superheater Coils Made from New Generation High Alloy Martensitic Steels Connected to Austenitic Creep-Resisting Steels and Supper Alloy Grades, for Supercritical Parameters

2011 ◽  
Vol 278 ◽  
pp. 466-471 ◽  
Author(s):  
Jerzy Pasternak ◽  
Janusz Dobrzanski
Keyword(s):  
Welded Joints ◽  
Base Material ◽  
Implementation Process ◽  
Steam Superheater ◽  
Austenitic Steels ◽  
Martensitic Steels ◽  
Operation Process ◽  
Supercritical Parameters ◽  
Steel Grades ◽  
Creep Resistant Steels

The continuously developing power generation sector, including boilers with supercritical parameters, requires applications of new creep-resistant steel grades for construction of boilers steam superheater components. Therefore, this paper contains selected information, results of the research and implementation process including: - evaluation, comparison of requested properties of base material and welded joints, such as tensile strength, impact strength and technological properties, - destructive examinations with evaluation of welded joints and HAZ structure and hardness distribution, - influence of manufacturing process in large boilermaker conditions and after simulated operation. A new creep-resistant steels to be used, in order to comply with the operational requirements, as to assure the appropriate reliability and safety of the boiler equipment in operation process. This document presents a simplified analysis of martensitic steels from group 9-12% Cr (T91, T92, HCM12A, VM12) and austenitic steels Cr-Ni (TP347FG, SUPER 304H, HR3C), having the chemical composition as presented in tables 1 and 2, which are to be applied for steam superheater components.

The strength of butt welded joints in thin sheet material

1992 ◽  
Vol 6 (2) ◽  
pp. 151-156
Author(s):  
P Hollmich ◽  
P Dubberstein ◽  
W Möbius
Keyword(s):  
Welded Joints ◽  
Sheet Material ◽  
Thin Sheet ◽  
Thin Sheet Material

Structural and mechanical properties of welded joints of reduced activation martensitic steels

2002 ◽  
Vol 307-311 ◽  
pp. 1563-1567 ◽  
Author(s):  
G. Filacchioni ◽  
R. Montanari ◽  
M.E. Tata ◽  
L. Pilloni
Keyword(s):  
Mechanical Properties ◽  
Welded Joints ◽  
Martensitic Steels

Durability Assessment of Thin Sheet Spot Welded Joints

1999 ◽  
Author(s):  
V. A. Pankhawala ◽  
S. Raju ◽  
B. B. Srivastava ◽  
P. Vasudevan
Keyword(s):  
Welded Joints ◽  
Thin Sheet ◽  
Durability Assessment ◽  
Spot Welded

Advanced Local Concepts for Assessing the Fatigue Durability of Welded Joints

2007 ◽  
Vol 348-349 ◽  
pp. 565-568
Author(s):  
C.M. Sonsino ◽  
D. Radaj ◽  
W. Fricke
Keyword(s):  
Fracture Mechanics ◽  
Welded Joints ◽  
Thin Sheet ◽  
Plate Thickness ◽  
Lap Joints ◽  
Structural Stress ◽  
Notch Stress ◽  
Weld Toe ◽  
Mechanics Concepts ◽  
Weld Root

Some recently developed variants of local concepts for assessing the fatigue strength and structural durability of welded joints are reviewed. These comprise structural stress, notch stress or strain and fracture mechanics concepts. New variants of the structural stress concept are Dong’s gradient stress approach and Xiao-Yamada’s ‘one millimetre stress’ approach. FE meshing rules have been developed for welded joints in thin sheet structures. The concept of fictitious notch rounding is now better substantiated for aluminium alloys. The small-size notch concept is applicable to thin sheet lap joints. The new notch stress intensity factor concept is based on the singular stresses at the sharp weld toe notch. Advanced fracture mechanics concepts combine crack initiation at the seam weld root or nugget edge and crack propagation over the plate thickness resulting in endurable FK values as function of cycles per unit thickness, N/t.

Study on Microstructure and Formability of Laser Tailor-Welded Joints of Aluminum Alloy Thin Sheet

2011 ◽  
Vol 239-242 ◽  
pp. 876-880
Author(s):  
Yun Tao Li ◽  
Juan Ye ◽  
Jin Kui Wang ◽  
Ji Shun Song ◽  
Jian Zhang
Keyword(s):  
Aluminum Alloy ◽  
Base Metal ◽  
Welded Joints ◽  
Thin Sheet ◽  
Laser Beam Welding ◽  
Base Material ◽  
Transition Process ◽  
Fusion Boundary ◽  
Tailor Welded Blanks ◽  
Columnar Grains

As an advanced manufacturing technology, tailor welded blanks (TWB) not only meet different requirements of properties in different parts, but also can satisfy the requirements of weight reduction and energy conservation. 6061 aluminum alloy with the thickness of 1mm was jointed by laser beam welding technology and the microstructure of tailor-welded joints was analyzed compare to base metal. The forming and bulging property characteristics of TWB were evaluated through tensile and cupping tests. Experimental results indicated that: the weld joints contained fine equiaxed grains in the center of the weld and columnar grains and dendrites near the fusion boundary were observed to be oriented towards the center of the weld. The dendrites became smaller and thinner during the transition process from the weld fusion boundary to the center. The fracture path of the TWB tensile specimens occurred in the heat-affected zone (HAZ) with the tensile and yield strength increased while the strain hardening coefficient and elongation reduced compared to base metal. The erichsen index of TWB in the cupping test was lower than base material, which demonstrated that the bulging property of the TWB was worse than base metal.

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