Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 30, Problem 59SDP
To determine
Explain the reason behind the preheating of the components to be welded will be effective in reducing the likelihood of developing cracks.
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Chapter 30 Solutions
Manufacturing Engineering & Technology
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...
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- Enumerate the types of joint in welding.arrow_forwardWhen steel is joined using arc welding, only the liquid fusion zone must be protected by a gas or flux. However, when titanium is welded, both the front and back sides of the welded metal must be protected. Why must these extra pre-cautions be taken when joining titanium?arrow_forwardWhat advantages do the welded joints offer in comparison to riveted joints? Explain a minimum of seven?arrow_forward
- Explain how heat treatment is applied in welding processes and what its importance is.arrow_forwardDiscuss in details different type of resistance welding with the help of best diagramarrow_forward1. What do you understand by the term welded joint? How it differs from riveted joint? 2. Sketch and discuss the various types of welded joints used in pressure vessels. What are the consider- ations involved? 3. State the basic difference between manual welding, semi-automatic welding and automatic welding. 4. What are the assumptions made in the design of welded joint? 5. Explain joint preparation with particular reference to butt welding of plates by arc welding. 6. Discuss the standard location of elements of a welding symbol. 7. Explain the procedure for designing an axially loaded unsymmetrical welded section. 8. What is an eccentric loaded welded joint ? Discuss the procedure for designing such a joint. 9. Show that the normal stress in case of an annular fillet weld subjected to bending is given by 5.66 M O = Lsd2 where M= Bending moment; s = Weld size and d= Diameter of cylindrical element welded to flat %3D %3D surface.arrow_forward
- A circular electrode of 190 mm diameter is used for carrying out seam welding at 5 welds per cm on a mild steel tube of thickness 1.5 mm. The duration of the welding cycle is given as On - 4 cycles, Off- 3 cycles. The power supply is at 50 Hz. Calculate work speed, welds per minutę, RPM, and energy requirement assuming effective resistance between an electrode as 100u ohm.arrow_forwardA welding operation is time-studied during which an operator was pace-rated as 120%. The operator took, on an average, 8 minutes for producing the weld-joint. If a total of 10% allowances are allowed for this operation. What is the expected standard production rate of the weld-joint in units per 8 hour day?arrow_forwardGive information about residual stresses and distortions after welding.arrow_forward
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