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Research Papers

Load Carrying Capacities of Butt Welded Joints in High Strength Steels

[+] Author and Article Information
M. Khurshid

Division of Lightweight Structures,
Department of Aeronautical and
Vehicle Engineering,
KTH—Royal Institute of Technology,
Teknikringen 8,
Stockholm 100 44, Sweden
e-mail: khurshid@kth.se

Z. Barsoum

Division of Lightweight Structures,
Department of Aeronautical and
Vehicle Engineering,
KTH—Royal Institute of Technology,
Teknikringen 8,
Stockholm 100 44, Sweden
Department of Aerospace Engineering,
Khalifa University of Science,
Technology and Research,
P.O. Box 127788,
Abu Dhabi, UAE
e-mail: zuheir@kth.se

I. Barsoum

Division of Lightweight Structures,
Department of Aeronautical and
Vehicle Engineering,
KTH—Royal Institute of Technology,
Teknikringen 8,
Stockholm 100 44, Sweden
Department of Mechanical Engineering,
The Petroleum Institute,
P.O. Box 2533,
Abu Dhabi, UAE
e-mail: ibarsoum@pi.ac.ae

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received October 17, 2014; final manuscript received May 21, 2015; published online June 15, 2015. Assoc. Editor: Vadim V. Silberschmidt.

J. Eng. Mater. Technol 137(4), 041003 (Oct 01, 2015) (9 pages) Paper No: MATS-14-1198; doi: 10.1115/1.4030687 History: Received October 17, 2014; Revised May 21, 2015; Online June 15, 2015

The aim of this study is to investigate the influence of yield strength of the filler material and weld metal penetration on the load carrying capacity of butt welded joints in high-strength steels (HSS) (i.e., grade S700 and S960). These joints are manufactured with three different filler materials (under-matching, matching, and over-matching) and full and partial weld metal penetrations. The load carrying capacities of these mentioned joints are evaluated with experiments and compared with the estimations by finite element analysis (FEA), and design rules in Eurocode3 and American Welding Society Code AWS D1.1. The results show that load carrying estimations by FEA, Eurocode3, and AWS D1.1 are in good agreement with the experiments. It is observed that the global load carrying capacity and ductility of the joints are affected by weld metal penetration and yield strengths of the base and filler materials. This influence is more pronounced in joints in S960 steel welded with under-matched filler material. Furthermore, the base plate material strength can be utilized in under-matched butt welded joints provided appropriate weld metal penetration and width is assured. Moreover, it is also found that the design rules in Eurocode3 (valid for design of welded joints in steels of grade up to S700) can be extended to designing of welds in S960 steels by the use of correlation factor of one.

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References

Figures

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Fig. 1

Designed test specimen: (a) butt joint design full (X) and partial penetration (V) and (b) dumble shaped test specimen

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Fig. 2

Vickers hardness tests and etched surfaces: (a) S700 hardness measurements top line, (b) S960 hardness measurements top line, (c) S700 under-matching etched surface, and (d) S960 under-matching etched surface

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Fig. 3

Modeled geometries and boundary conditions: (a) full penetration and (b) partial penetration

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Fig. 4

True stress strain curves base and filler materials: (a) S700 and (b) S960

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Fig. 5

Load–deformation curves S700: (a) under-matching full penetration, (b) under-matching partial penetration, (c) matching full penetration, (d) matching partial penetration, (e) over-matching full penetration, and (f) over-matching partial penetration

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Fig. 6

Load–deformation curves S960: (a) under-matching full penetration, (b) under-matching partial penetration, (c) matching full penetration, and (d) matching partial penetration

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Fig. 7

Estimated failure locations experimental and FEA: (a) front view partial penetrated joint experimental, (b) side view partial penetrated joint experimental, (c) front view partial penetrated joint plastic strains FEA, (d) side view partial penetrated joint plastic strains FEA, (e) front view fully penetrated under-matched S960 experimental, (f) side view fully penetrated under-matched S960 experimental, (g) front view fully penetrated under-matched S960 joint plastic strains FEA, (h) side view fully penetrated under-matched S960 joint plastic strains FEA, (i) front view fully penetrated S700 experimental, (j) side view fully penetrated S700 experimental, (k) front view fully penetrated S700 plastic strains FEA, and (l) side view fully penetrated S700 plastic strains FEA

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Fig. 8

Load carrying capacity comparison: (a) S700 full penetration, (b) S700 partial penetration, (c) S960 full penetration, and (d) S960 partial penetration

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Fig. 9

Correlation factors: (a) S700 and (b) S960

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