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Welding Principles and Applications Chapter 30 Review Questi
Welding Principles and Applications Chapter 30 Review Questions
20
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12/03/2010

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Term
1. What protects the molten weld pool from oxidation during a gas weld?
Definition
The carbon monoxide & carbon dioxide produced in the flame.
Term
2. How does tip size affect a gas weld?
Definition
It can be used to control weld width, penetration and speed.
Term
3. How does torch angle affect a gas weld?
Definition
It can be used to control welding speed and size of the molten weld pool.
Term
4. How does welding rod size affect a gas weld?
Definition
It can be used to control the molten weld pool size, buildup and penetration.
Term
5. What is a good indication that the molten weld pool is not being protected from oxidation?
Definition
A large quantity of sparks being thrown off of the molten weld pool.
Term
6. Why should the end of the gas filler rod be bent?
Definition
So you can tell which end is hot & to reduce the hazard to others working next to you.
Term
7. What is the purpose of a heat sink?
Definition
To draw off excessive heat which will keep the welding pool narrow with little penetration and high buildup.
Term
8. Why should the end of the welding rod be kept inside the flame envelope?
Definition
To prevent the hot end of the welding rod from becoming oxidized.
Term
9. Does a weld have to have 100% penetration to be strong?
Definition
No, not if the weld reinforcement does not have to be removed.
Term
10. What technique can be used to minimize weld distortion on a flat butt joint?
Definition
It can be controlled by using a backstepping weld, properly tacking and clamping.
Term
11. Why does the edge of the top plate on a lap joint tend to melt more easily?
Definition
There is less material to absorb the heat.
Term
12. What is meant by the term out-of-position?
Definition
Any weld other than a flat weld, i.e., vertical, horizontal, overhead.
Term
13. What holds the molten weld pool in place on a vertical weld?
Definition
The shelf forms as the molten weld pool solidifies.
Term
14. What additional personal safety protection should be used for overhead welds?
Definition
Gloves, leather sleeves, leather apron, and cap.
Term
15. What force holds the molten weld pool in place on an overhead weld?
Definition
Surface tension.
Term
16. What is the welding sequence on a 1G weld?
Definition
Start at the 2’oclock position and end at the 11’oclock position. Roll the pipe and repeat the above process until the weld is completed around the pipe.
Term
17. What is the proper method for stopping a weld pool so it can be easily restarted?
Definition
You should slightly taper down the molten weld pool by flashing the torch off.
Term
18. What welding positions are required when making a 5G weld on pipe?
Definition
Flat, vertical and overhead.
Term
19. What welding positions are required when making a 6G weld on pipe?
Definition
Flat, vertical, horizontal and overhead.
Term
20. How can 100% penetration be ensured when making welds on thin-wall tubing?
Definition
Watch for a key hole at the leading edge of molten weld pool.