Lesson A5–6: Applying Shielded Metal Arc Welding
Define the following terms.
Part One: Matching
Instructions. Match the term with the correct response. Write the letter of the term by the definition.
a. arc length e. electrode h. welder
b. arc welding f. polarity i. welding
c. duty cycle g. resistance j. weldor
_______ 1. Melting, flowing together and freezing of metals under controlled conditions.
_______ 2. Bare metal rod.
_______ 3. Person doing the welding.
_______ 4. Opposition to the flow of current in a circuit.
_______ 5. Uses electricity to heat and melt the metal.
_______ 6. Machine doing the welding.
_______ 7. Flow of tiny particles called electrons through a conductor.
_______ 8. Direction the current is flowing.
_______ 9. Percentage of a 10 minute period that a welder can operate at a given current setting.
_______ 10. Distance from the tip of the bare end of the electrode to the base metal.
Part Two: Completion
Instructions. Provide the word or words to complete the following statements.
1. Electron flow in one direction is called ________________ ______________.
2. The process of building up several layers of weld deposit by running overlapping passes is
known as ___________________.
3. ___________ _________________ is equal to the diameter of the bare end of the electrode.
4. Correct speed of travel should produce a bead that is _________ to _________ times the diameter
of the bare end of the electrode.
Kentucky Agricultural Education Lesson Plan Library — Agricultural Mechanics and Technology
Unit A. Problem Area 5. Lesson 6. Page 14.
5. Correct amp setting depends on the ____________________ of the base metal and the
_________________ of the electrode.
6. When electrical current alternates or reverses the direction of electron flow is called
7. _____________________ is what causes the electric energy to be transformed into heat.
8. Running a bead with a sidewise or oscillating motion is called _______________.
Part Three: Short Answer
Instructions. Provide information to answer the following questions. Use complete sentences.
1. What are the requirements of a good or sound weld?
2. What are the three functions of flux?
From Objective 5 summarize what you believe are the top 10 safety rules when welding.
List the four welding positions: