scholarly journals Influence of themo-mechanical treatments and microstructural state on the fatigue behaviour of a weald seam: case of API X60 steel

2021 ◽  
Vol 15 (58) ◽  
pp. 365-375
Author(s):  
Mohammed Achoui ◽  
Fethi Sebaa ◽  
Benattou Bouchouicha
Keyword(s):  
Weld Seam ◽  
Filler Metal ◽  
Fatigue Cracking ◽  
Correct Choice ◽  
Fatigue Behaviour ◽  
Heterogeneous Structure ◽  
Propagation Axis ◽  
Welding Direction ◽  
Change Of Microstructure ◽  
New Phase

The aim of this work is the study of the fatigue behaviour of API X60 steel and the influence of thermal and mechanical treatments. The evaluation of the integrity and safety of welded structures dictates the approach taken in this research. The microstructural observations on the different zones of the weld seam indicates that the variation of heterogeneous structure is a progressive destruction of the strips of lamination which cause a new phase leading to a drop in the mechanical properties requiring treatment after welding. The fatigue cracking rate diverges beyond the threshold of DK, but no deviation of the crack from its propagation axis was noticed, which confirms the correct choice of filler metal over that of the base metal with an overmatching M = 1.1, and the treatments applied to the structure. This fatigue cracking rate transversal to the welding direction initially presents an aspect similar to that of BM but registers a delay as soon as the crack tip enters the second zone (HAZ) then it progresses rapidly. This evolution is characterized by a disturbance due to the repeated change of microstructure.

Evaluation of Repair Welding Influence on GH3535 Superalloy Microstructure and Mechanical Properties

2016 ◽  
Author(s):  
Chaowen Li ◽  
Shuangjian Chen ◽  
Kun Yu ◽  
Zhijun Li
Keyword(s):  
Mechanical Properties ◽  
Arc Welding ◽  
Weld Seam ◽  
Filler Metal ◽  
Short Term ◽  
Weld Repair ◽  
Repair Welding ◽  
Gas Tungsten Arc ◽  
Rolled Plates ◽  
Carbide Precipitate

GH3535 supperalloy, whose grade of ASME is UNS N10003, is currently considered as a candidate material for solid-fuel and fluid-fuel molten salt reactor in china. During the development of procedures for welding GH3535 superalloy, consideration should always be given to the possibility that repair welding may be necessary. This paper presents weld repairs of GH3535 alloy rolled plates using gas tungsten arc welding with filler metal. The purpose of this work is to evaluate the low heat input process for weld repair of GH3535 alloy plates about the microstructure features and mechanical properties. The results demonstrated that sound joints without defects could be obtained after weld repairs. Due to repair thermal cycles on the original weld seam, the size of carbide precipitate became large, but repair welding is found to cause no decrease in short-term time-independent strength.

Semi-Solid Stirring Brazing of SiCp/A356 Composites and Aluminum Alloy in Air

2011 ◽  
Vol 189-193 ◽  
pp. 3521-3524 ◽  
Author(s):  
Hui Bin Xu ◽  
Quan Xiang Luo ◽  
Chun Tian Li ◽  
Chang Hua Du
Keyword(s):  
Aluminum Alloy ◽  
Oxide Film ◽  
Weld Seam ◽  
Filler Metal ◽  
Joint Region ◽  
Base Materials ◽  
Semi Solid ◽  
Micro Structures ◽  
Two Sides ◽  
Sic Particle

The semi-solid brazing process of SiCp/A356 composites and aluminum alloy was investigated. The two substrates were heated up to the semisolid temperature range of Zn-Al filler metal in the joint region by a resistance heating plate. At this point a stirrer was introduced into the weld seam in order to mix filler metal and the two sides of substrates into a single uniform joint. After stirring, specimens were sectioned for analysis of macro- and micro-structures along the weld region. The research shows that SiCp/A356 composites and aluminum can be successfully joining with semi-solid filler metal. It can be found that most of the oxide film on the surface of the base metal was disrupted and removed through the observation by SEM. The metallurgical bonds formed between the filler metal and the base materials. Moreover, the oxide film of surface of aluminum alloy was more thoroughly disrupted and removed than that of surface of composites with existing of Sic particle. The joint microstructure with globular α-Al grain enclosed by rich-Zn phase can be obtained after stirring brazing.

scholarly journals Application Features of Ultrasonic Welding

2018 ◽  
Vol 9 (1) ◽  
pp. 31-34
Author(s):  
Gyula Bagyinszki ◽  
Enikő Bitay
Keyword(s):  
Production Line ◽  
Weld Seam ◽  
Filler Metal ◽  
Welding Process ◽  
Ultrasonic Welding ◽  
Welding Parameters

Abstract The technological advantages of ultrasonic welding: (no requirement for filler metal; use of small electrical transient resistance contacts; ability to weld thin materials to thick materials) results in a helium-solid weld seam; the computer configuration of the welding parameters can easily be solved; clean and safe workflow (no sparks, flame or smoke); can be integrated into the production line. This article deals with some of the additional application features of this welding process.

Fatigue Strength of Cobalt-Base Alloys with High Corrosion Resistance for Artificial Hip Joints

1978 ◽  
Vol 7 (4) ◽  
pp. 241-250 ◽  
Author(s):  
M. Lorenz ◽  
M. Semlitsch ◽  
B. Panic ◽  
H. Weber ◽  
H. G. Willert
Keyword(s):  
Fatigue Strength ◽  
Hip Joint ◽  
Cast Alloy ◽  
Fatigue Cracking ◽  
Fatigue Behaviour ◽  
Hip Joints ◽  
Artificial Joints ◽  
Surgical Implants ◽  
Artificial Hip Joints ◽  
Cobalt Base

Loosening of the anchorage in the bone is a problem in hip-joint arthroplasty which up to now has not been entirely solved. In the loosened condition, anchorage stems of artificial joints are subject to alternating overload which causes rupture if the fatigue strength is exceeded by the stress amplitude. At Sulzer a hip-joint anchorage stem made from wrought CoNiCrMo alloy Protasul-10 has been developed which has substantially higher fatigue strength than stems made from stainless steel of grade AISI-316L or CoCrMo cast alloy. It is therefore essentially safe from fatigue cracking and this offers the possibility of significantly easier removal in case of re-operation after loosening. This paper deals with some rules to be observed in choice or development of materials for long-term implants subject to fatigue. The results of laboratory investigations on the fatigue behaviour of cobalt-base alloys for surgical implants are discussed.

scholarly journals Study of Asphalt-Concrete Pavement Fatigue Modeling

2021 ◽  
Vol 16 (1) ◽  
pp. 24-36
Author(s):  
Peteris Skels ◽  
Viktors Haritonovs ◽  
Pavel Akishin ◽  
Andris Freimanis
Keyword(s):  
Fatigue Cracks ◽  
Fatigue Cracking ◽  
Element Model ◽  
Fatigue Behaviour ◽  
Asphalt Pavements ◽  
Fatigue Properties ◽  
Surface Loading ◽  
Asphalt Concrete Pavement ◽  
Cyclic Surface

Deterioration of asphalt pavements due to fatigue cracking is one of the most common highway pavement failure types. If the fatigue cracks are allowed to develop and grow, the driving comfort and safety, i.e., serviceability of the pavement, decreases. Pavement fatigue behaviour is not a straightforward mechanism and involves many factors and effects, thus computational methods are developed in order to help understand how the pavement works. This paper explores the accuracy and applicability of a less computational resource demanding procedure that uses transient material mechanical behaviour to model the long-term behaviour of a pavement structure. First, the mechanical and fatigue properties of asphalt were determined at the laboratory. Then a four-layer finite-element model was created using Ansys software. Two different models – with and without infinity elements – and two different fatigue simulation procedures – full and simplified – were considered. Material parameters were obtained by the laboratory tests and material properties degraded over time. Cyclic surface loading was applied to simulate the passing of a truck – 6 million fatigue cycles were simulated.

Study on Stirring Brazing of SiCp/A356 Composites with the Zn27Al Filler Alloy in Air

2011 ◽  
Vol 383-390 ◽  
pp. 2710-2713
Author(s):  
Hui Bin Xu ◽  
Bo Fang Zhou ◽  
Quan Xiang Luo ◽  
You Liang Zeng ◽  
Chang Hua Du
Keyword(s):  
Tensile Strength ◽  
Oxide Film ◽  
Weld Seam ◽  
Filler Metal ◽  
Filler Alloy ◽  
Resistance Heating ◽  
Melt Temperature ◽  
Micro Structures ◽  
Two Sides ◽  
Joining Process

The joining process of SiCp/A356 composites is investigated. The two substrates are heated up to the melt temperature of Zn27Al filler metal by a resistance heating plate. At the time, a stirrer is introduced into the liquid weld seam in order to mix filler metal and two sides of substrates into a single uniform joint. After stirring, specimens are sectioned for the analysis of macro- and micro-structures along the weld region. The research shows that two typical joint interfaces with oxide film and without one were found. So, oxide film on the substrate wasn’t completely disrupted during stirring brazing at 500°C.And, the tensile strength of joint is only 50MPa.

Effect of Filler Metal Mechanical Properties on Fatigue Behaviour Welded Joints

2017 ◽  
Vol 71 (4) ◽  
pp. 977-984
Author(s):  
Abdelkader Alioua ◽  
Benattou Bouchouicha ◽  
Mokhtar Zemri ◽  
Abdellatif IMAD
Keyword(s):  
Mechanical Properties ◽  
Welded Joints ◽  
Filler Metal ◽  
Fatigue Behaviour

scholarly journals Optimization of Filler Metals Consumption in the Production of Welded Steel Structures

2016 ◽  
Vol 16 (1) ◽  
pp. 27-34
Author(s):  
K. Pańcikiewicz ◽  
L. Tuz ◽  
Z. Żurek ◽  
Ł. Rakoczy
Keyword(s):  
Filler Metal ◽  
Mobile Apps ◽  
Welding Process ◽  
Steel Structures ◽  
Correct Choice ◽  
Design Stage ◽  
Calculation Methods ◽  
Metal Consumption ◽  
Welded Steel ◽  
Filler Metals

Abstract The paper presents the some aspects of the optimization of filler metals consumption in the production of welded steel structures. Correct choice of beveling method can allow to decrease cost of production and increase quality. The review of calculation methods of filler metal consumption at the design stage was carried out. Moreover, the practical examples of amount of filler metals calculation were presented and analyzed. The article also contain examples of mobile apps which are makes it easy to see welding costs in just a few seconds. Apps as well as simple excel spreadsheets with correct mathematic equations allows to optimize welding process.

scholarly journals Multi-Material Design in Welding Arc Additive Manufacturing

Metals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 809
Author(s):  
Kai Treutler ◽  
Swenja Kamper ◽  
Marcel Leicher ◽  
Tobias Bick ◽  
Volker Wesling
Keyword(s):  
Structural Steel ◽  
Cyclic Load ◽  
Weld Seam ◽  
High Strength ◽  
Material Design ◽  
Material Strength ◽  
Fine Grained ◽  
Welding Arc ◽  
Welding Direction ◽  
Notched Components

Due to the inherent properties of the process, arc-based generative manufacturing offers the possibility, of specifically applying different material properties locally. One possibility to realize this is the use of different materials. Three approaches are presented to illustrate this option. First, anisotropic behavior in the welding direction is generated. For this purpose, a FeNi36 is specifically combined with a low-alloy ultra-high-strength fine-grained structural steel filler metal. It will be shown that the integral component properties can be specifically adjusted in the welding direction. In addition, the metallurgical and welding characteristics will be discussed. As a second possibility, the use of well plasticizable materials to locally increase the material strength under cyclic loading with locally notched components is presented. For this purpose, an austenitic FeNi36 with good plasticizability and a good yield strength ratio for the application was applied to a fillet weld of a high-strength fine-grained structural steel in the weld seam toe. It is shown that the tolerable cyclic load can be improved by 35% by this procedure. Thirdly, it is shown that the required thickness of corrosion protection layers can be reduced by 50% through a targeted production sequence in arc-based generative manufacturing.

Vacuum-Free Stirring Brazing of SiCP/A356 Composites and Aluminum Alloy Using Semisolid Filler Metal with Low Solid Fraction

2011 ◽  
Vol 306-307 ◽  
pp. 738-741
Author(s):  
Hui Bin Xu ◽  
Quan Xiang Luo ◽  
Liang Xing ◽  
Bo Fang Zhou ◽  
You Liang Zeng ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Oxide Film ◽  
Base Metal ◽  
Weld Seam ◽  
Filler Metal ◽  
Joint Region ◽  
Base Materials ◽  
Semi Solid ◽  
Micro Structures ◽  
Sic Particle

This paper explores the brazing process of SiCp/A356 composites and aluminum alloy using semisolid metal. The two substrates were heated up to the semisolid temperature range of Zn-Al filler metal in the joint region by a resistance heating plate. In order to mix the filler metal with the base metal of both sides to be a single uniform joint, a stirrer was introduced into the weld seam. After stirring, specimens were sectioned for analysis of macro- and micro-structures along the weld region. The research shows that SiCp/A356 composites and aluminum can be local joined with semi-solid filler metal. It can be found that part of the oxide film on the interface of the base metal was disrupted and removed through the observation by SEM. The metallurgical bonds can be formed between the filler metal and the base materials. Moreover, the oxide film of surface of aluminum alloy disrupted and removed was easier than that of surface of composites with existing of Sic particle. The joint microstructure with globular α-Al grain enclosed by rich-Zn phase can be obtained after stirring brazing.

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