Answers all questions 16.1 through 16.20

EXERCISES AND STUDY QUESTIONS 16.1 What are the three basic categories of conventional welding? Which of the three is the cleanest and most healthful? 16.2 What distinguishes soldering and brazing from welding? 16.3 What distinguishes soldering from brazing? 16.4 What is the commonly used name for the most popular process of arc welding? What is the official AWS (i) (American Welding Society) designation for this process? 16.5 Identify the following welding processes: (a) GTAW (b) GMAW (c) SAW (d) RSEW (i) (e) RSW 16.6 Why should acetylene cylinders be stored valve end up? 16.7 Why are oxygen cylinders charged at so much higher pressures than acetylene cylinders? 16.8 In what ways are greasy gloves of particular hazard to the oxyacetylene welder? 16.9 Describe a way in which gas welding can sometimes be modified to cut production costs and at the same time avoid hazards. 16.10 Why are valve protection caps important to safety? Explain the purpose of the slots in the caps 16.11 Explain the phenomenon of flashback in welding operations. 16.12 How can taping welding hoses together to keep them orderly result in a hazard? 16.13 Which of the following materials should be avoided in pipes used for delivering acetylene to the work station: steel, wrought iron, or copper? Explain. 16.14 How can small arc welding machines that use ordinary household current be more dangerous than industrial arc welding machines. 16.15 Why should welding cables be uncoiled before using? 16.16 What is the principal hazard of allowing metal tanks to become a part of a welding circuit? 16.17 What arc welding process is gaining popularity because it is more healthful than other arc welding processes? What big disadvantage does it have? 16.18 What is the principal mechanical hazard of spot welders? 16.19 Give at least two reasons why people are psychologically inclined to risk the chance of welding fires. 16.20 Against what principal hazard are welding permits aimed