EBK MANUFACTURING ENGINEERING & TECHNOL
7th Edition
ISBN: 9780100793439
Author: KALPAKJIAN
Publisher: YUZU
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 30, Problem 48QTP
A welding operation takes place on an aluminum-alloy plate. A pipe 2.5 in. in diameter, with a 0.20 in. wall thickness and a 2 in. length, is butt welded onto an angle iron 6 in. × 6 in. × 0.25 in. thick. The angle iron is of an L cross-section and has a length of 1 ft. If the weld zone in a gas tungsten arc welding process is approximately 0.5 in. wide, what would be the temperature increase of the entire structure due to the heat input from welding only? What if the process were an electron-beam welding operation, with a bead width of 0.08 in.? Assume that the electrode requires 1500 J and the aluminum alloy requires 1200 J to melt one gram.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
A continuous fillet wild is used to weld two
pieces of 7.0-mm-thick austenitic stainless steel plate in an arc-welding
operation. The plates are joined at a 90° angle using an inside fillet
corner joint. The velocity of the welding head is 6 mm/sec. Assume the
cross section of the weld bead approximates a right angle isosceles
triangle (a right triangle with the two legs and their corresponding
angles equal) with a leg length of 4.5 mm. The length of the weld = 230
mm. The melting factor of the setup = 0.65, the heat transfer factor =
0.90, and the Tm for austenitic stainless steel = 1670°K. Determine (a)
The amount of heat (in joules) required to melt the volume of metal in
(b) The heat that
, (c) The rate of heat
generation required at the welding source to accomplish the weld
this weld (filler metal plus base metal)
must be generated at the heat source
An axially-loaded welded angular connection is shown SD-002 . The angular section 150 x 100 x 10 mm having an area of 2400 mm? is welded to
a gusset plate having a thickness of 10 mm. All steel is A 36 (Fy = 248 MPa, Fu = 400 MPa) and E (70) electrodes (Fu = 484 MPa) is used. Using the
shielded metal-arc welding process. Compute the value of "a" if T = 500 kN. (Please do not round-off to whole number the required thickness,
use the exact (2 decimal) value.)
150 mm
SD-002
Assume that two 1.5-mm thick steel sheets are being spot welded at a current of 4000 A and current-flow time is 0.3 s. Using electrodes 5 mm in diameter, estimate the amount of heat generated and the amount of heat required to melt the weld nugget. Use an effective resistance of 350 un. Take u= 9,7 Joule/mm Which one of the following are correct? O
a. If the electrodes were 7 mm diameter, the amount of heat generated would decrease
b. The amount of heat generated by the equipment is between 1600 to 1700 Joules
c. The equipment has enough power to weld the steel sheets.
d. The equipment does not have enough power to weld the steel sheets
e. The amount of heat required is between 700 and 750 Joules
Chapter 30 Solutions
EBK MANUFACTURING ENGINEERING & TECHNOL
Ch. 30 - Describe fusion as it relates to welding...Ch. 30 - Explain the features of neutralizing, reducing,...Ch. 30 - What is stick welding?Ch. 30 - Explain the basic principles of arc-welding...Ch. 30 - Why is shielded metal-arc welding a commonly...Ch. 30 - What keeps the weld bead on a steel surface...Ch. 30 - Describe the functions and characteristics of...Ch. 30 - What are the similarities and differences between...Ch. 30 - What properties are useful for a shielding gas?Ch. 30 - What are the advantages to thermit welding?
Ch. 30 - Explain where the energy is obtained in...Ch. 30 - Explain how cutting takes place when an...Ch. 30 - What is the purpose of flux? Why is it not needed...Ch. 30 - What is meant by weld quality? Discuss the...Ch. 30 - How is weldability defined?Ch. 30 - Why are welding electrodes generally coated?Ch. 30 - Describe the common types of discontinuities...Ch. 30 - Prob. 18RQCh. 30 - Explain why hydrogen welding can be used to...Ch. 30 - Prob. 20RQCh. 30 - Prob. 21QLPCh. 30 - It has been noted that heat transfer in gas-metal...Ch. 30 - Explain why some joints may have to be...Ch. 30 - Describe the role of filler metals in welding.Ch. 30 - List the processes that can be performed with...Ch. 30 - What is the effect of the thermal conductivity of...Ch. 30 - Describe the differences between oxyfuel-gas...Ch. 30 - Could you use oxyfuel-gas cutting for a stack of...Ch. 30 - What are the advantages of electron-beam and...Ch. 30 - Describe the methods by which discontinuities...Ch. 30 - Explain the significance of the stiffness of the...Ch. 30 - Prob. 32QLPCh. 30 - Which of the processes described in this chapter...Ch. 30 - Prob. 34QLPCh. 30 - Prob. 35QLPCh. 30 - Comment on the factors involved in electrode...Ch. 30 - Prob. 38QLPCh. 30 - Prob. 39QLPCh. 30 - Prob. 40QLPCh. 30 - Prob. 41QLPCh. 30 - What is weld spatter? What are its sources? How...Ch. 30 - Describe your observations concerning Fig. 30.20.Ch. 30 - Prob. 44QLPCh. 30 - Plot the hardness in Fig. 30.20d as a function of...Ch. 30 - A welding operation will take place on carbon...Ch. 30 - In Fig. 30.26b, assume that most of the top...Ch. 30 - A welding operation takes place on an...Ch. 30 - An arc welding operation is taking place on carbon...Ch. 30 - Comment on workpiece size and shape limitations...Ch. 30 - Arc blow is a phenomenon where the magnetic...Ch. 30 - Review the types of welded joints shown in Fig....Ch. 30 - Comment on the design guidelines given in...Ch. 30 - Prob. 55SDPCh. 30 - Prob. 56SDPCh. 30 - Make a list of welding processes that are suitable...Ch. 30 - Prob. 58SDPCh. 30 - Prob. 59SDPCh. 30 - Review the poor and good joint designs shown...Ch. 30 - In building large ships, there is a need to weld...Ch. 30 - Prob. 62SDPCh. 30 - Comment on whether there are common factors...Ch. 30 - Prob. 64SDPCh. 30 - Lattice booms for cranes are constructed from...Ch. 30 - A common practice in repairing expensive broken...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- List the five joint types used in welding.arrow_forward5. A steel cylindrical air receiver with 5 feet diameter and pressure load of 180 psi, design stress of 9500 psi maximum. The pressure vessel is to be provided with a 1.5 in diameter drain valve installed at the bottom of the vessel and a safety pressure relief valve is installed either at the topmost or at the side with a pop-out rating of 200 psi. Assume a 100% weld joint efficiency. The lap welding tensile strength is 65,000 psi. Determine the bursting pressure of this air receiver. psiarrow_forwardQUESTION 1 In an arc welding operation, a groove weld has a cross-sectional area=0.055 in² and is 24 in long. (Round your final answers to 1 decimal place) (a) What quantity of heat (in Btu) is required to accomplish the weld, if the metal to be welded is aluminum? Btu (b) How much heat must be generated at the welding source, if the heat transfer factor = 90% and the melting factor = 60%? H= Btuarrow_forward
- Show your complete solution.arrow_forwardstrength of materialsarrow_forwardA GTAW operation is performed on low carbon steel, whose unit melting energy is 10.3 J/mm3. The welding voltage is 22 volts and the current is 135 amps. The heat transfer factor is 0.7 and the melting factor is 0.65. If filler metal wire of 3.5 mm diameter is added to the operation, the final weld bead is composed of 60% volume of filler and 40% volume base metal. If the travel speed in the operation is 5 mm/sec, determine (a) cross-sectional area of the weld bead, and (b) the feed rate (mm/sec) at which the filler wire must be supplied.arrow_forward
- 4. Design a welded connection to resist the loading shown below (service load). A double angle tension member, 2 L5x5x5/16, is connected to a 3/8 inch thick gusset plate with fillet welding. Fy = 50 ksi for the angles and Fy = 36 ksi for the gusset plate. Compute the size and length of welding on the side of angles based on LRFD and indicate the information on the sketch. 1 = %" 2L5 x 5 x h6 D = 30 k L= 75 karrow_forwardA bracket to be welded into a steel channel using E-60 electrode 345 Mpa) Two welding sets are suggested as shown in Fig. (1)Based on maximum shear stress failure theory and safety factor of (2.5) (a) Find the weld size for each set. (b) Which set would you recommend A or B ?arrow_forwardExample 27.2. A 100 mm x 10 mm plate is to be 150 mm x 10 mm by the fillet welding on three sides. The size of the weld is 6 mm. Find out the necessary over lap of the plate, for full strength of the joint. Take allowable tensile stress in plate equal to 150 N/mm and allowable stress in weld as 110 N/mm. welded to another platearrow_forward
- 2.8 Advantages of Submerged Arc Welding Cost per unit length of joint is relatively low The arc is under a blanket of flux, which virtually eliminates arc flash, spatter, and fume. • Extremely high deposition rates and welding speeds are possible. • Sound welds are readily made (with good process design and control). High current densities increase weld penetration and decrease the need for edge preparation. High speed welding of thin sheet steels at over 2.5 m/min is possible. Can be easily Automated Minimum welder training is required (relatively unskilled welders can be employed). • Low hydrogen weld deposits can be produced. • The flux acts as a scavenger and deoxidizer to remove contaminants such as oxygen, nitrogen, and sulphur from the molten weld pool. This helps to produce sound welds with excellent mechanical properties. 26 2.9 Limitations of Submerged Arc Welding Initial cost of wire feeder, power supply, controls, and flux-handling equipment is high. Limited to ferrous…arrow_forwardSelect an appropriate weld technique and joint design for welding 150mm of thick material.arrow_forwardHi, I need help with this question.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Welding: Principles and Applications (MindTap Cou...Mechanical EngineeringISBN:9781305494695Author:Larry JeffusPublisher:Cengage Learning
Welding: Principles and Applications (MindTap Cou...
Mechanical Engineering
ISBN:9781305494695
Author:Larry Jeffus
Publisher:Cengage Learning
Differences between Temporary Joining and Permanent Joining.; Author: Academic Gain Tutorials;https://www.youtube.com/watch?v=PTr8QZhgXyg;License: Standard Youtube License