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23 Cards in this Set
- Front
- Back
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Temperature, expressed in °F or °C, refers to the measure of? |
Intensity or energy |
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The term heat expresses? |
Quantity |
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Which is a common cause of distortion? |
Unequal heating and cooling of welds |
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When heated unevenly and without restraint, in which direction does the metal expand? |
Volumetrically (all directions) |
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Transitional expansion occurs when a metal changes from? |
One crystalline structure to another |
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Which type of distortion results in an overall reduction in the length of the weld? |
Longitudinal distortion |
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Which type of distortion results from shrinkage across the weld that tends to pull a member of the tee joint toward the welded side ? |
Angular distortion |
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Which type of distortion refers to the tendency (in butt joints) for plates to draw together down the length of the joint as you are welding |
Tansverse distortion |
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What causes angular distortion in a vee groove weld if the plates are free to move ? |
The non-uniform contraction of the weld metal |
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What is the primary cause of distortion created from longitudinal shrinkage ? |
Weld beads contracting upon cooling |
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What welding variable is more likely to have the plates of a butt joints draw together causing transverse distortion |
Welding at a slower Rate |
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Whay is one method you can use to correct angular distortion on butt joints |
Weld on both sides |
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How can you reduce longitudinal distortion |
Keep the weld reinforcement to a minimum |
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What is the one method to reduce transverse distortion |
Use a fast deposition Rate |
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What is the disadvantage to rigid clamping and fixturing? |
Some distortion can occur after releasing the clamp |
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What is on advantage of a jigging device ? |
It maintains accuracy of the finished product |
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Pieces of metal paves on either side of the joint that absorb the heat of the weld and helps prevent distortion are called? |
Chill strip |
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What is the purpose of the balancing welds around a neutral axis of a worn shaft |
To equalize the contraction stresses of the welds |
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How can you help control distortion when welding lights gauge material |
Increase the number of tacks |
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Which fillet weld application produces the greatest amount of distortion |
Multi pass welds with a convex profile |
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What is one characterstic of a good welding design |
It uses formed or rolled sections to reduce distortion |
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When several played must be welded together with butt joints, whay is the best weld sequence to control distortion ? |
Weld from the Centre and toward the outside in both directions |
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What is the advantage of using sub-assemblies ? |
They provide for more welds in the flat position |
