Welding: Principles and Applications (MindTap Course List)
8th Edition
ISBN: 9781305494695
Author: Larry Jeffus
Publisher: Cengage Learning
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Chapter 2, Problem 30R
What is hot work?
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Complete the following problems. Show your work/calculations, save as.pdf and upload to the
assignment in Blackboard.
missing information to present a completed program. (Hint: You may have to look up geometry
for the center drill and standard 0.5000 in twist drill to know the required depth to drill).
1. What are the x and y dimensions for the center position of holes 1,2, and 3 in the part shown in
Figure 26.2 (below)?
6.0000
Zero
reference
point
7118
1.0005
1.0000
1.252
Bore
6.0000
.7118
Cbore
0.2180 deep
(3 holes)
2.6563 1.9445
Figure 26.2
026022 (8lot and Drill Part)
(Setup Instructions---
(UNITS: Inches
(WORKPIECE NAT'L SAE 1020 STEEL
(Workpiece: 3.25 x 2.00 x0.75 in. Plate
(PRZ Location 054:
'
XY 0.0 - Upper Left of Fixture
TOP OF PART 2-0
(Tool List
( T02 0.500 IN 4 FLUTE FLAT END MILL
#4 CENTER DRILL
Dashed line indicates-
corner of original stock
( T04
T02
3.000 diam. slot
0.3000 deep.
0.3000 wide
Intended toolpath-tangent-
arc entry and exit sized to
programmer's judgment…
A program to make the part depicted in Figure 26.A has been created, presented in figure 26.B, but some information still needs to be filled in. Compute the tool locations, depths, and other missing information to present a completed program. (Hint: You may have to look up geometry for the center drill and standard 0.5000 in twist drill to know the required depth to drill).
We consider a laminar flow induced by an impulsively started infinite flat
plate. The y-axis is normal to the plate. The x- and z-axes form a plane parallel
to the plate. The plate is defined by y = 0. For time t <0, the plate and the flow
are at rest. For t≥0, the velocity of the plate is parallel to the 2-coordinate;
its value is constant and equal to uw. At infinity, the flow is at rest. The flow
induced by the motion of the plate is independent of z.
(a) From the continuity equation, show that v=0 everywhere in the flow and
the resulting momentum equation is
მu
Ət
Note that this equation has the form of a diffusion equation (the same form as
the heat equation).
(b) We introduce the new variables T, Y and U such that
T=kt, Y=k/2y, U = u
where k is an arbitrary constant. In the new system of variables, the solution
is U(Y,T). The solution U(Y,T) is expressed by a function of Y and T and the
solution u(y, t) is expressed by a function of y and t. Show that the functions are
identical.…
Chapter 2 Solutions
Welding: Principles and Applications (MindTap Course List)
Ch. 2 - What is the key to preventing accidents in a...Ch. 2 - Who is ultimately responsible for the welder’s...Ch. 2 - Describe the three classifications of burns.Ch. 2 - What emergency steps should be taken to treat...Ch. 2 - List the three types of light that may be present...Ch. 2 - Which type of light is the most likely to cause...Ch. 2 - What can be done on the job site to reduce the...Ch. 2 - What is the name of the eye burn that can occur in...Ch. 2 - In what two ways can ultraviolet light burn the...Ch. 2 - Why is it important to seek medical treatment for...
Ch. 2 - What fabric(s) are the best choice to wear as...Ch. 2 - Describe the ideal work shirt, pants, boots, and...Ch. 2 - Why is it unsafe to carry butane lighters or...Ch. 2 - What special protective items can be worn to...Ch. 2 - Why must eye protection be worn at all times in...Ch. 2 - What types of injuries can occur to the ears...Ch. 2 - What types of protection are available to protect...Ch. 2 - What types of information should be covered in a...Ch. 2 - Name two types of respirators and describe how...Ch. 2 - List the materials that can give off dangerous...Ch. 2 - Why must metal that has been used before be...Ch. 2 - Under what conditions can natural ventilation be...Ch. 2 - Name two advantages of recycling scrap metal.Ch. 2 - When must forced ventilation be used?Ch. 2 - Who must be provided with safety data sheets...Ch. 2 - Describe an acceptable storage area for a cylinder...Ch. 2 - How must high-pressure gas cylinders be stored so...Ch. 2 - What should be done with a leaking cylinder if the...Ch. 2 - Why is it important for acetylene cylinders to not...Ch. 2 - What is hot work?Ch. 2 - How far away should highly combustible materials...Ch. 2 - When is a fire watch needed?Ch. 2 - List the four types of fire extinguishers and the...Ch. 2 - Why is it important to have a planned maintenance...Ch. 2 - Why is it important to keep a welding area clean?Ch. 2 - What should you do if you have to leave a piece of...Ch. 2 - Why must a mushroomed chisel or hammer be...Ch. 2 - What causes most electric shock in the welding...Ch. 2 - According to the Welding Safety Checklist in...Ch. 2 - What can happen if too much power is being carried...Ch. 2 - Why must equipment be turned off and unplugged...Ch. 2 - According to Table 2-2, what gauge wire size would...Ch. 2 - What is a GFCI?Ch. 2 - List five safety tips for safe extension cord use.Ch. 2 - List 10 safety rules for the safe use of portable...Ch. 2 - Why is it important to not weld when everything is...Ch. 2 - List two types of grinders used by welders.Ch. 2 - How close to the grinding stone face should the...Ch. 2 - Name metal cutting machines used in the welding...Ch. 2 - Describe how a person should safely lift a heavy...Ch. 2 - List the things that should be inspected on a...Ch. 2 - List and explain five ladder use safety rules.
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- Part A: Suppose you wanted to drill a 1.5 in diameter hole through a piece of 1020 cold-rolled steel that is 2 in thick, using an HSS twist drill. What values if feed and cutting speed will you specify, along with an appropriate allowance? Part B: How much time will be required to drill the hole in the previous problem using the HSS drill?arrow_forward1.1 m 1.3 m B 60-mm diameter Brass 40-mm diameter Aluminum PROBLEM 2.52 - A rod consisting of two cylindrical portions AB and BC is restrained at both ends. Portion AB is made of brass (E₁ = 105 GPa, α = 20.9×10°/°C) and portion BC is made of aluminum (Ę₁ =72 GPa, α = 23.9×10/°C). Knowing that the rod is initially unstressed, determine (a) the normal stresses induced in portions AB and BC by a temperature rise of 42°C, (b) the corresponding deflection of point B.arrow_forward30 mm D = 40 MPa -30 mm B C 80 MPa PROBLEM 2.69 A 30-mm square was scribed on the side of a large steel pressure vessel. After pressurization, the biaxial stress condition at the square is as shown. For E = 200 GPa and v=0.30, determine the change in length of (a) side AB, (b) side BC, (c) diagnonal AC.arrow_forward
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- The truss shown below sits on a roller at A and a pin at E. Determine the magnitudes of the forces in truss members GH, GB, BC and GC. State whether they are in tension or compression or are zero force members.arrow_forwardA weight (W) hangs from a pulley at B that is part of a support frame. Calculate the maximum possible mass of the weight if the maximum permissible moment reaction at the fixed support is 100 Nm. Note that a frictionless pin in a slot is located at C.arrow_forwardIt is the middle of a winter snowstorm. Sally and Jin take shelter under an overhang. The loading of the snow on top of the overhang is shown in the figure below. The overhang is attached to the wall at points A and B with pin supports. Another pin is at C. Determine the reactions of the pin supports at A and B. Express them in Cartesian vector form.arrow_forward
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