816 Agricultural Mechanics and Technology Systems
Copyright Goodheart-Willcox Co., Inc.
Know and Understand
Answer the following questions using the information provided in this chapter.
1. The SMAW process is best suited for bonding _____ metals.
2. The fl ux coating on an SMAW electrode chemically reacts to the heat of the arc, creating
a(n) _____-free shield of gas around the molten weld pool.
3. The size of an electrode is determined by its _____, and the electrode type is determined by
the fl ux coating.
4. An E7018 electrode will produce a fi nished weld with a tensile strength of _____ psi.
5. What are the fi ve main classifi cations of welded joints?
6. What are the four basic welding positions recognized by the AWS?
7. What three main factors determine the amperage required to weld?
8. The deposition of spatter around a completed weld is an indication of a(n) _____ arc
length.
9. A pointed effect in the ripple of the fi nished bead results from too much electrode _____.
10. If welding travel speed is too fast or too slow, the result will likely be a bead that lacks
_____.
11. When welding material over 5/16″ in thickness, it is advisable to _____ the joint edges to
ensure complete penetration.
12. _____ electrodes should be chosen to weld on steels with a high carbon content.
13. Weld discontinuities that are at an unacceptable level are considered weld _____.
14. Name two nondestructive test methods used on welds.
15. Why should welders wear shirts with no pockets or covered pockets?
16. Why is tapping a better method of striking an arc than scratching?
17. Drilling holes at both ends of a crack and _____ the weld as it cools are measures used to
reduce cracking when cast iron is welded.
18. Welders can obtain welding _____ by passing tests based on welding code in which they
produce welds under prescribed conditions.
STEM and Academic Activities
1. Science. Working with a partner, coil the leads of welding machine in small loops on the
fl oor while welding. As one person welds, have the other person sprinkle iron fi lings over
and around the coiled leads. What happens to the iron fi lings? What causes this? What are
the implications to safety and health? Be sure to store the equipment properly and clean
up the iron fi lings.
2. Technology. List several factors you would consider when choosing a new SMAW
welding machine to purchase for farm repairs.