Welding: Principles and Applications (MindTap Course List)
8th Edition
ISBN: 9781305494695
Author: Larry Jeffus
Publisher: Cengage Learning
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Textbook Question
Chapter 18, Problem 25R
What is the 5G pipe position?
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2 A metal block of mass m = 10 kg is sliding along a frictionless surface with an initial speed
Vo, as indicated below. The block then slides above an electromagnetic brake that applies a
force FEB to the block, opposing its motion. The magnitude of the electromagnetic force
varies quadratically with the distance moved along the brake (x):
10
FEB = kx²,
with k
= 5
N
m²
V₁ = 8 m/s
m = 10 kg
FEB
Frictionless surface
Electromagnetic brake
⇒x
Determine how far the block slides along the electromagnetic brake before stopping, in m.
Q1: Determine the length, angle of contact, and width of a 9.75 mm thick
leather belt required to transmit 15 kW from a motor running at 900 r.p.m. The
diameter of the driving pulley of the motor is 300 mm. The driven pulley runs at
300 r.p.m. and the distance between the centers of two pulleys is 3 meters. The
density of the leather is 1000 kg/m³. The maximum allowable stress in the
leather is 2.5 MPa. The coefficient of friction between the leather and pulley is
0.3. Assume open belt drive.
5. A 15 kW and 1200 r.p.m. motor drives a compressor at 300 r.p.m. through a pair of spur gears having
20° stub teeth. The centre to centre distance between the shafts is 400 mm. The motor pinion is made
of forged steel having an allowable static stress as 210 MPa, while the gear is made of cast steel
having allowable static stress as 140 MPa. Assuming that the drive operates 8 to 10 hours per day
under light shock conditions, find from the standpoint of strength,
1. Module; 2. Face width and 3. Number of teeth and pitch circle diameter of each gear.
Check the gears thus designed from the consideration of wear. The surface endurance limit may be
taken as 700 MPa. [Ans. m = 6 mm; b= 60 mm; Tp=24; T=96; Dp = 144mm; DG = 576 mm]
Chapter 18 Solutions
Welding: Principles and Applications (MindTap Course List)
Ch. 18 - What types of industries require GTAW-quality pipe...Ch. 18 - What are the grooves most often used for welding...Ch. 18 - What condition must the prepared edges of a pipe...Ch. 18 - How is the depth of root penetration measured?Ch. 18 - What problem can incomplete fusion cause?Ch. 18 - What are the common causes of a concave root...Ch. 18 - What problems can excessive root reinforcement...Ch. 18 - Prob. 8RCh. 18 - What gases are used as backing gases?Ch. 18 - How long would it take to purge a 15-ft section of...
Ch. 18 - How long would it take to purge a 10-mm section of...Ch. 18 - How can filler metal be added to make a root pass?Ch. 18 - Prob. 13RCh. 18 - How is the tack weld ended so that it will not...Ch. 18 - What is the 1G pipe position?Ch. 18 - After the weld is set up and ready to begin, how...Ch. 18 - What type of weld can be made using the nozzle...Ch. 18 - What two problems can be corrected by a hot pass?Ch. 18 - Why must you brace yourself when making a weld?Ch. 18 - What can happen to the weld pool if the torch...Ch. 18 - What technique should be used when stopping a...Ch. 18 - What is the maximum width that a weave pattern...Ch. 18 - Why should the filler pass penetration be limited...Ch. 18 - How much filler metal should be added to a filler...Ch. 18 - What is the 5G pipe position?Ch. 18 - How should the torch be held to allow good...Ch. 18 - Why are stringer beads in the 6G position kept...
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