DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Textbook Question
Chapter 38, Problem 1P
A common problem with brazed or soldered joints is galvanic corrosion, because the joint usually involves dissimilar metals in direct metal-to-metal electrical contact.
- For each of the various solder or braze joints described below, determine which material will act as the corroding anode:
- Two pieces of low-carbon steel being brazed with a copper-base brazing alloy.
- A copper wire being soldered to a steel sheet using lead-tin solder.
- Pieces of tungsten carbide being brazed into recesses in a carbon-steel plate.
- How do the various lead-free solders compare to the conventional lead-tin solders with regard to their potential for galvanic corrosion?
- If galvanic corrosion becomes a significant and chronic problem in a brazed assembly, what changes might you suggest that could possibly reduce or eliminate the problem?
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Students have asked these similar questions
A 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
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Answer by true (T) or false (F) for the folling sentences
1. Fusion welding means that the two surfaces to be joined and the filler metal are meling during welding
and then solidifying in similar menner to local casting process.
2. In oxyacetylene welding process, the welding is done using oxidizing flame only.
3. Explusive welding process produces strong joints of dissimilar materials that are not weldable by are.
4. Hot working leads to eliminating the porosity in the metal and increasing the strength and hardness.
5. Work hardening is a characteristic induced in the processing part because of the heat treatment.
Explain why
1. using tin in food production.
2. using aluminum in overhead cables
3.
Carbon is lost from the positive electrodes
4.
cooper is widely used in electrical applications
5.
the air is blown through the molten copper
6. alloy of lead and tin is most widely utilized as a solder material
7. Tin is used as protective coating material for iron and steel
8. alloy of lead and tin is most widely utilized as a solder material
Chapter 38 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 38 - What are some joining conditions where welding...Ch. 38 - What are some of the lower-temperature methods of...Ch. 38 - In what ways is a thermit weld similar to the...Ch. 38 - What is the source of the welding heat in thermit...Ch. 38 - For what types of applications might thermit...Ch. 38 - What is the source of the welding heat in...Ch. 38 - What are some of the various functions of the slag...Ch. 38 - Electroslag welding would be most attractive for...Ch. 38 - What is the source of heat in electron-beam...Ch. 38 - Why is a high vacuum required in the electron-beam...
Ch. 38 - What types of production limitations are imposed...Ch. 38 - What are the major assets and negative features of...Ch. 38 - What are some of the attractive features of...Ch. 38 - What is unique about the fusion zone geometry of...Ch. 38 - Describe the weld pool geometry and size of the...Ch. 38 - What is an autogenous weld?Ch. 38 - What might be necessary to permit the laser...Ch. 38 - What are some of the Ways in which laser-beam...Ch. 38 - What are the three common types of industrial...Ch. 38 - Which type of laser light can be transmitted...Ch. 38 - What are some of the attractive features of a...Ch. 38 - Why is laser-beam welding an attractive process...Ch. 38 - What are the attractive properties of hybrid...Ch. 38 - Prob. 24RQCh. 38 - What is the function of the assist gas in...Ch. 38 - What is the difference between exothermic cutting...Ch. 38 - Which type of laser is preferred for cutting...Ch. 38 - Prob. 28RQCh. 38 - Prob. 29RQCh. 38 - What features have made lasers a common means of...Ch. 38 - What are some of the attractive features of laser...Ch. 38 - What are some common objectives of surfacing...Ch. 38 - What types of materials are applied by surfacing...Ch. 38 - Prob. 34RQCh. 38 - What is the benefit of high-velocity oxyfuel...Ch. 38 - What are some of the arc or plasma techniques that...Ch. 38 - How is thermal spraying similar to surfacing? How...Ch. 38 - Prob. 38RQCh. 38 - Prob. 39RQCh. 38 - Provide a reasonable definition of brazing?Ch. 38 - What are some key differences between brazing and...Ch. 38 - What kinds of materials or combinations can be...Ch. 38 - What advantages can be gained by the lower...Ch. 38 - Why do brazed joints have an enhanced...Ch. 38 - What is the most important factor influencing the...Ch. 38 - How does capillary action relate to joint...Ch. 38 - Why is it necessary to adjust the initial...Ch. 38 - What is wettability? Fluidity? How do each relate...Ch. 38 - What are the two most common types of brazed...Ch. 38 - How do the butt-lap and scarf joint configurations...Ch. 38 - What are some important considerations when...Ch. 38 - What are some of the most commonly used brazing...Ch. 38 - Why are eutectic alloys attractive as brazing...Ch. 38 - What special measures should be taken when brazing...Ch. 38 - What are the three primary functions of a brazing...Ch. 38 - Why is it important to preclean brazing surfaces...Ch. 38 - How might braze metal be preloaded into joints?Ch. 38 - What is the purpose of brazing jigs and fixtures?Ch. 38 - 59- What are some factors to consider when...Ch. 38 - What are the advantages and disadvantages of torch...Ch. 38 - What is the primary attraction of furnace-brazing...Ch. 38 - Why might reducing atmospheres or a vacuum be...Ch. 38 - What are some of the attractive features of...Ch. 38 - Why is dip brazing usually restricted to use with...Ch. 38 - What are some of the attractive features of...Ch. 38 - Why is flux removal a necessary part of many...Ch. 38 - What benefits can be achieved through fluxless...Ch. 38 - How does braze welding differ from traditional...Ch. 38 - What is the primary difference between brazing and...Ch. 38 - What are the six steps of a soldering operation?Ch. 38 - Why is soldering unattractive if a high-strength...Ch. 38 - For many years, the most common solders have been...Ch. 38 - What is driving the conversion to lead-free...Ch. 38 - What are some of the difficulties encountered when...Ch. 38 - What are the two basic families of soldering flux?Ch. 38 - What are some of the more common heat sources for...Ch. 38 - Why is wave soldering attractive for making the...Ch. 38 - Describe the vapor-phase soldering process.Ch. 38 - A common problem with brazed or soldered joints is...Ch. 38 - When molten metal deposition is applied to a...Ch. 38 - Prob. 3P
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- Do all braze joints resist corrosion? Give an example.arrow_forwardQuestion 1 1.1 Identify the weld defect shown in Figure 1 below. Provide reasons for your selection. Figure 1: Weld defect 1.2 Explain how the weld defect, shown in Figure 1, can occur. 1.3 Identify the joining process shown in Figure 2 and explain why this process is frequently used by automotive manufacturers. Figure 2: Joining process frequently used by automotive manufacturers 1.4 Explain the main differences between the joining process shown in Figure 2 and fusion welding processes. 1.5 Name important design considerations applicable to the joining process shown in Figure 2.arrow_forwardAn RSW operation is used to join two pieces of sheet steel having a unit melting energy of 8369.85 J/cm3. The sheet steel has a thickness of 0.3125 cm. The weld duration will be set at 0.25 sec with a current of 11,000 amp. Based on the electrode diameter, the weld nugget will have a diameter of 0.75 cm. Experience has shown that 40% of the supplied heat melts the nugget and the rest is dissipated by the metal. If the electrical resistance between the surfaces is 130 micro-ohms, what is the thickness of the weld nugget assuming it has a uniform thickness?arrow_forward
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