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