Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 30, Problem 7RQ
Describe the functions and characteristics of electrodes. What functions do coatings have? How are electrodes classified?
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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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- How do most manufacturers classify or group hard-facing or wear-resistant electrodes?arrow_forwardExplain the residual stress in weldin operations. What kind of geometries or machine elements are likely to suffer from residual stress? Give your opinions on avoiding this problem ?arrow_forwardWhat groups have developed electrode identification systems?arrow_forward
- Calculate the electrode tip diameter if the thickness of low carbon steel type of material is 1.2mm.arrow_forwardIn one type of welding, electric charge flows between the welding tool and the metal pieces that are to be joined. This produces a glowing arc whose high temperature fuses the pieces together. Why must the tool be held close to the metal pieces? (i) To maximize the potential difference between tool and pieces; (ii) to minimize this potential difference; (iii) to maximize the electric field between tool and pieces; (iv) to minimize this electric field; (v) more than one of these.arrow_forwardq5arrow_forward
- How do tools affect the accuracy of the finished workpiece in welding works? Is it possible to have an accurate workpiece without welding tools or instruments?arrow_forwardA 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_forwardAn ECM operation is used to cut a square-shaped blind hole into a nickel block (valence = 2). The frontal working area of the electrode is 1583.2 mm?. Applied current = 1200 A and voltage = 12 volts. (a) If the process is 90% efficient, determine the rate of metal removal in mm/min. (b) If the electrolyte resistivity = 150 ohm-mm, determine the working gap. (c) If the gap created at the sides of the square-shaped electrode is equal to the working gap from part (b), determine the area of the square-shaped hole that is created (ignore rounding at corners). (d) How much time is required to cut the blind hole to a depth of 20 mm. (a) 2508 mm³/mm; (b) 0.1056 mm; (c) 1600.05 mm²; (d) 17.29 min O (a) 2216 mm /mm; (b) 0.3739 mm; (c) 1600.05 mm²; (d) 19.29 min O (a) 2216 mm /mm; (b) 0.1056 mm; (c) 1600.05 mm²; (d) 24.29 min O (a) 2216 mm/mm; (b) 0.1056 mm; (c) 1600.05 mm²; (d) 10.29 min (a) 2216 mm3/mm; (b) 0.1056 mm; (c) 1600.05 mm²; (d) 14.29 minarrow_forward
- Identify the conditions under which a brazed joint is likely to be “stronger” than the brazing material by itself. Describe the trends in joint fracture strength as it becomes wider/narrower or thinner/thicker.arrow_forwardengineering materials and processes Discuss the welding process and List the tools used in welding process. Identify its application and discuss its use.arrow_forwardA resistance spot-welding operation is performed on two pieces of 1.5 mm thick sheet steel using 12000 amps current for a duration of 0.20 second. The electrodes are 6 mm in diameter at the contacting surfaces. Resistance is assumed to be 0.0001 ohms and the resulting weld nugget is 6 mm in diameter and 2.5 mm thick. The unit melting energy for the metal is 12 Jmm³. What portion of heat generated was used to form the weld?arrow_forward
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