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Dr. A. Aziz Bazoune
King Fahd University of Petroleum & MineralsMechanical
Engineering DepartmentCH-9 LEC 41 Slide *Dr. A. Aziz Bazoune
Chapter 9: Welding, Bonding, and the Design of Permanent Joints
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent Joints
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent Joints
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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Fig. 9-17a shows a cantilever welded to a support by fillet
welds at top and bottom.
CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent Joints9-4 Stresses in Welded
Joints in BendingA FBD diagram of the beam would show a shear force
V and a moment diagram M. The shear force produces a primary shear
in the welds of magnitude
The moment M introduces a throat shear stress component of 0.707
in the welds.
Treating the two welds of Fig. 9-17b as lines we find the second
moment of area to be
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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The second moment of area I, based on weld throat area, is
The nominal throat shear stress is now found to be
The model gives the coefficient of 1.414, in contrast to the
predictions of Sec.9-2 of 1.197 from distortion energy, or 1.207
from maximum shear.
The second moment of area in Eq. (d) is based on the distance d
between the two welds.
CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent Joints9-4 Stresses in Welded
Joints in Bending
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent Joints
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent Joints9-5 The Strength of
Welded JointsThe matching of the electrode properties with those of
parent metal is usually not so important as speed, operator appeal,
and the appearance of the completed joint.
The properties of electrodes vary considerably, but Table 9-3
lists the minimum properties for some electrode classes.
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent JointsIt is preferable, in
designing welded components, to select a steel that ill result in a
fast, economical weld.
Best results are obtained for steels having a UNS specifications
between G10140 and G10230.
All these steels have a tensile strength in the hot-rolled
condition in the range of 60 to 70 kpsi.
Permissible stresses are now based on the yield strength of the
material instead of the ultimate strength, and the code permits the
use of a variety of ASTM structural steels having yield strengths
varying from 33 to 50 kpsi.
For these ASTM steels, Sy = 0.5 Su.
Table 9-4 lists the formulas specified by the code for
calculating these permissible stresses for various load
conditions.
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent Joints
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent JointsThe fatigue stress
concentration factors listed in Table 9-5 are suggested for use.
These factors should be used for the parent metal as well as for
the weld metal.
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent JointsTable 9-6 gives
steady-load information and minimum fillet sizes.
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent JointsTable A-20, Sy = 27.5
kpsi h =3/8=0.375 int = 1/2 inl = 2 in
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent Jointsh =3/8=0.375 int = 1/2
inl = 2 in
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent JointsTable 9-3, Sy = 50 kpsi,
Sut= 62 kpsi Table 9-2, pattern 2, b=3/8 = 0.375 in and d= 2in
Table A-20, Sy = 32 kpsi, Sut= 58 kpsi
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent JointsEq. 6-21Ssy= 0.577
SyE6010 electrodeTable 9-3, Sy = 50 kpsi,
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent JointsGiven n=3
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent Joints
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent JointsTable A-20, Sy = 32
kpsi, Sut= 58 kpsi Table 9-3, Sy = 62 kpsi, Sut= 50 kpsi Table 9-5,
Kfs=2.7
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent Joints
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
-
CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent Joints
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent
Joints(7-4)(7-25)(7-8)(7-17)(7-56)(7-10)
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent Joints
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
-
CH-9 LEC 41 Slide *Dr. A. Aziz Bazoune Chapter 9: Welding,
Bonding, and the Design of Permanent Joints
Dr. A. Aziz Bazoune Chapter 9: Welding, Bonding, and the Design
of Permanent Joints
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