Welding Metallurgy of

Home
/
Papers
/
Welding Metallurgy of

Welding Metallurgy of

01 Jan 1987-

About: The article was published on 1987-01-01 and is currently open access. It has received 991 citations till now. The article focuses on the topics: Welding.

...read moreread less

Citations

PDF

Open Access

More filters

Journal Article•DOI•

A review on selective laser sintering/melting (SLS/SLM) of aluminium alloy powders: Processing, microstructure, and properties

[...]

E. O. Olakanmi¹, E. O. Olakanmi², Robert F. Cochrane¹, Kenneth Dalgarno³•Institutions (3)

University of Leeds¹, Federal University of Technology Minna², Newcastle University³

01 Oct 2015-Progress in Materials Science

TL;DR: In this article, the state of the art in selective laser sintering/melting (SLS/SLM) processing of aluminium powders is reviewed from different perspectives, including powder metallurgy (P/M), pulsed electric current (PECS), and laser welding of aluminium alloys.

...read moreread less

1,172 citations

Cites background from "Welding Metallurgy of"

...(......................................................3/)(16 33* VSL GSG ∆=∆ θπγ According to Kou [144] and Savage [145], growth of the solid in fusion welding is perceived as being initiated by epitaxial growth from the substrate and proceeds by competitive growth toward the center line of the weld....
[...]
...100 the predominant mechanism of solidification in fusion welding is the competitive growth in the weld fusion zone, Kou [144] identified and discussed the details of other mechanisms such as dendrite fragmentation, grain detachment, heterogeneous nucleation and surface nucl eatio that may tend can interrupt and/or dominate the solidification structure in fusion welding....
[...]
...According to Kou [144] and Savage [145], growth of the solid in fusion welding is...
[...]
...Whereas, the predominant mechanism of solidification in fusion welding is the competitive growth in the weld fusion zone, Kou [144] identified and discussed the details of other mechanisms such as dendrite fragmentation, grain detachment, heterogeneous nucleation and surface nucleatio that may tend can interrupt and/or dominate the solidification structure in fusion welding....
[...]

Journal Article•DOI•

Dislocation network in additive manufactured steel breaks strength–ductility trade-off

[...]

Leifeng Liu¹, Qingqing Ding², Yuan Zhong¹, Ji Zou³, Jing Wu³, Yu-Lung Chiu³, Jixue Li², Ze Zhang², Qian Yu², Zhijian Shen¹ - Show less +6 more•Institutions (3)

Stockholm University¹, Zhejiang University², University of Birmingham³

06 Dec 2017-Materials Today

TL;DR: In this article, the authors show that the pre-existing dislocation network, which maintains its configuration during the entire plastic deformation, is an ideal modulator that is able to slow down but not entirely block the dislocation motion.

...read moreread less

557 citations

Journal Article•DOI•

Critical review of automotive steels spot welding: process, structure and properties

[...]

Majid Pouranvari¹, S. P. H. Marashi²•Institutions (2)

Islamic Azad University¹, Amirkabir University of Technology²

18 Nov 2013-Science and Technology of Welding and Joining

TL;DR: In this article, the fundamental understanding of structure-properties relationship in automotive steels resistance spot welds is discussed. And a brief review of friction stir spot welding, as an alternative to RSW, is also included.

...read moreread less

Abstract: Spot welding, particularly resistance spot welding (RSW), is a critical joining process in automotive industry. The development of advanced high strength steels for applications in automotive industry is accompanied with a challenge to better understand the physical and mechanical metallurgy of these materials during RSW. The present paper critically reviews the fundamental understanding of structure–properties relationship in automotive steels resistance spot welds. The focus is on the metallurgical characteristics, hardness–microstructure correlation, interfacial to pullout failure mode transition and mechanical performance of steel resistance spot welds under quasi-static, fatigue and impact loading conditions. A brief review of friction stir spot welding, as an alternative to RSW, is also included.

...read moreread less

369 citations

Cites background from "Welding Metallurgy of"

...Despite the fact that Schaeffler diagram predicts two phases (austenite plus ferrite) in the FZ of AISI 304 weld nugget microstructure, under rapid solidification conditions such as laser beam welding, a shift in solidification mode may occur.(90) It is generally believed that the change in solidification mode can often result in a fully austenitic microstructure compared to the two phase (ferrite plus austenite) microstructure that is commonly found after primary ferrite solidification....
[...]
...In coarse grained region, which is beside the FZ, both high cooling rate and large austenite grain size coupled with the formation of the carbon rich austenite promote the formation of the martensite.(90) Figure 15 shows the microstructure gradient in TRIP780 RSW....
[...]
...The HAZ in carbon steel weldments can be divided into three distinct subregions: (i) upper critical HAZ (UCHAZ): This region experiences peak temperatures above Ac3 transforming BM microstructure into austenite.(90) Depending on the peak temperature the supercritical HAZ can be divided to the following zones: coarse grained HAZ (CGHAZ) and fine grained HAZ....
[...]
...It is generally believed that the change in solidification mode can often result in a fully austenitic microstructure compared to the two phase (ferrite plus austenite) microstructure that is commonly found after primary ferrite solidification.(90,95,96) Although the change in solidification mode of stainless steel in RSW has not been studied yet, very high cooling rate in RSW process can explain the formation of a fully austenitic weld nugget, as it is the case for laser beam welding....
[...]
...If this temperature is above Mf, there can be untransformed austenite left in the FZ and it can redecompose to untempered martensite upon cooling to room temperature after tempering.(90) For a particular tempering time and tempering current, there is a minimum cooling time to achieve PF mode....
[...]

Journal Article•DOI•

Revisiting fundamental welding concepts to improve additive manufacturing: From theory to practice

[...]

João Pedro Oliveira¹, Telmo G. Santos¹, Rosa Maria Mendes Miranda¹•Institutions (1)

University of Lisbon¹

01 Jan 2020-Progress in Materials Science

TL;DR: In this article, a unified equation to compute the energy density is proposed to compare works performed with distinct equipment and experimental conditions, covering the major process parameters: power, travel speed, heat source dimension, hatch distance, deposited layer thickness and material grain size.

...read moreread less

369 citations

Journal Article•DOI•

Using deep neural network with small dataset to predict material defects

[...]

Shuo Feng¹, Huiyu Zhou¹, Hongbiao Dong¹•Institutions (1)

University of Leicester¹

15 Jan 2019-Materials & Design

TL;DR: This study attempted to predict solidification defects by DNN regression with a small dataset that contains 487 data points and found that a pre-trained and fine-tuned DNN shows better generalization performance over shallow neural network, support vector machine, and DNN trained by conventional methods.

...read moreread less

314 citations

Cites background from "Welding Metallurgy of"

...Solidification crack is one of the most serious defects which occurs widely in welding [27,28], casting [29–31] and additive manufacturing (AM) [32,33], which occurs at the last stage of solidification when liquid films exist between dendrites boundaries where local strains cannot be accommodated by liquid feeding and solid deformation....
[...]

1
2
3
4
…
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199

Collapse

References

PDF

Open Access

More filters

Journal Article•DOI•

Microstructural characterisation and liquation behaviour of laser welded joint of fine grained AZ91 magnesium alloy thin sheets

[...]

Z. M. Yang, Hongge Yan, J. H. Chen, Bin Su, G. H. Zhang, Q. Zhao - Show less +2 more

22 Jan 2015-Science and Technology of Welding and Joining

TL;DR: In this paper, fine-grained AZ91 sheets of 1 mm in thickness were successfully welded by autogenous laser beam welding with filler strip, and the welded joints are characterised by fine equiaxed dendrites in the fusion zones and free from significant grain coarsening in the heat affected zones.

...read moreread less

Abstract: Fine grained AZ91 sheets of 1 mm in thickness were successfully welded by autogenous laser beam welding and laser beam welding with filler strip. Both welded joints are characterised by fine equiaxed dendrites in the fusion zones and free from significant grain coarsening in the heat affected zones. There are two kinds of liquation reactions in the partially melted zone of the autogenous laser beam welding joint, which are associated with the melting of residual bulky β-Mg17Al12 phase and the constitutional liquation of submicrometre β-Mg17Al12 precipitates. No liquation reaction is detected in the welded joint obtained by laser beam welding with filler strip. The laser beam welding joint with filler strip for AZ91 thin sheets is free from evident collapse.

...read moreread less

7 citations

Development and Use of a Simple Test Method to Evaluate Reheat Cracking Sensitivity in the Weld Deposit Region of a Submerged Arc Weld

[...]

Maxwell Calder Trent

01 Jan 2012

7 citations

Dissertation•

Preliminary Benchmarking of the HYB (Hybrid Metal Extrusion & Bonding) Process for Butt Welding of AA6082-T6 Plates Against FSW and GMAW

[...]

Lise Sandnes

01 Jan 2017

TL;DR: In this paper, Sammendrag and Preface and Acknowledgements are used to describe the relationship between a preface and acknowledgements of a manuscript. And a list of tables and abbreviations is given.

...read moreread less

Abstract: ..................................................................................................................................... i Sammendrag ............................................................................................................................ iii Preface and Acknowledgements ............................................................................................. v List of Figures ........................................................................................................................... x List of Tables .......................................................................................................................... xiv List of Abbreviations .............................................................................................................. xv

...read moreread less

7 citations

Journal Article•DOI•

Resistance spot welding of Nimonic 263 nickel-based superalloy: microstructure and mechanical properties

[...]

M. Bemani¹, Majid Pouranvari¹•Institutions (1)

Sharif University of Technology¹

02 Jan 2020-Science and Technology of Welding and Joining

TL;DR: In this paper, the metallurgical and mechanical response of Nimonic 263 nickel-based superalloy to resistance spot welding is addressed. Solidification structure of the fusion zone is described in terms o...

...read moreread less

Abstract: This paper addresses the metallurgical and mechanical response of Nimonic 263 nickel-based superalloy to resistance spot welding. Solidification structure of the fusion zone is described in terms o...

...read moreread less

7 citations

Journal Article•DOI•

Friction stir welding of novel T-phase strengthened Zn-modified Al–Mg alloy

[...]

Di Zhang¹, Xu Wang¹, Yanlin Pan¹, Shengli Hou¹, Jishan Zhang¹, Linzhong Zhuang¹, L. Zhou² - Show less +3 more•Institutions (2)

University of Science and Technology Beijing¹, Harbin Institute of Technology²

01 Mar 2021-Journal of Materials Science

TL;DR: In this paper, the authors reported Zn-modified novel Al-Mg alloys with Zn/Mg ratio below 1.0 and showed that the strength of the welded alloy can be increased by 100MPa owing to the distribution of T-mg32(AlZn)49 hardening precipitates during friction stir welding and the subsequent heat treatment after welding.

...read moreread less

Abstract: Friction stir welding is extensively used in aluminum alloys for advanced engineering applications. A current challenge for 5 × × × series alloys is their poor welding strength due to the lack of hardening precipitates. Here we report Zn-modified novel Al–Mg alloys with Zn/Mg ratio below 1.0. Compared with 5 × × × series alloys, the strength of the welded alloy can be increased by 100 MPa owing to the distribution of T-Mg32(AlZn)49 hardening precipitates during friction stir welding and the subsequent heat treatment after welding. Fine spherical T″ precipitates and coarsening polygonal T′ precipitates are both observed at the thermo-mechanically affected zone. The bimodal distribution of the precipitates and the widest precipitate-free zone weakened the strength of this region, and thus the welded alloys are fractured at this area. The novel alloy with T precipitates is expected to further stimulate the researchers to improve the properties of traditional 5 × × × series alloy.

...read moreread less

7 citations