Instructor’s Manual For Welding Principles and Practices Sixth Edition Edward R. Bohnart 

CHAPTER 1
A. Review Answers
1. c
2. a
3. c
4. c
5. a
6. d
7. d
8. b
9. a
10. b
11. c
12. d
13. a
14. a
15. d
16. a
17. b
18. d
19. d
20. d
21. c
22. a
23. No. Welding began more than 3000 years ago when hot or cold metals were hammered to
obtain a forge weld.
24. Four metals which were used by early metal workers may include copper, bronze, silver,
gold, and iron. Copper was the first to be worked.
25. The Chinese developed the ability to make steel from wrought iron in 589 A.D.
26. The first patent for electric arc welding was first issued in the United States.
27. The invention of the coated electrodes gave electric arc welding its greatest boost.
28. Answers may vary but should include such process as: GTAW OR TIG, GMAW OR MIG,
SMAW, Submerged arc welding, Plasma arc welding, welding of plastics, etc.
29. No. MIG or GMAW has increased very rapidly; it is now used in many industries.
30. Answers may vary but should include such jobs as: welding operator, welder fitter,
combination welder, welding supervisor, welding foreman, equipment sales, welding
instructor, robotics welding operator, welding engineer, certified welding inspector.
31. Answers may vary but should include such jobs as: welding engineer, technical editor,
welding professor.
32. MIG or GMAW process contributed most to aluminum welding.
B. Internet Activities
A. Answers may vary. Sample answers: Welding in Space and Related Technologies,
Structural Stability of Deposits and Welded Joints in Power Engineering, Metallurgy of
Arc Welding, Arc Slag Remelting of Steel and Alloys.
B. Answers may vary. Sample answer: Safety issues from the AWS Web site
(www.aws.org)—noise, tripping and falling, fumes and gases, burn protection.