State the seven material properties that are related to welding.
Melting Point, Boiling Point, Thermal Conductivity, Specific Heat, Expansion, Electrical Conductivity, Ductility
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What is 'melting point' and what are the benefits of a low melting point?
The temperature at which a given solid will melt, a low melting point makes it cheaper to weld as less energy is required.
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Why are boiling points dangerous in regards to welding?
Low boiling points can cause metal vapours to be given off that are dangerous to welders.
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Why can thermal conductivity be an issue?
The heat input into the weld is carried away faster than it can raise the temperature of the metal to the melting point. Makes for an expensive weld because more energy is required.
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What is high thermal conductivity essential for in welding?
Over head welding, to reduce the chance of molten material dripping.
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What is specific heat and what effect does it have on welding?
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius and a low values give cheaper welds as less energy is used to melt the parent metal.
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Why can expansion be an issue when welding? Name three
High values can lead to distorted welds when cooled. If cooled rapidly, the welds can crack. Can make it difficult to weld dissimilar metals as they create internal stresses when cooling.
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Why is electrical conductivity relevant to welding?
It is used as a factor to operate resistance welding and if the electrical conductivity is too high it will not be possible to create enough heat in a joint to allow welding to occur.
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Why is ductility necessary for solid state welding?
Material must be plastically deformed.
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What four properties is the final weld expected to have?
Strength, Ductility, Hardness and Impact Resistance
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Other cards in this set
Card 2
Front
What is 'melting point' and what are the benefits of a low melting point?
Back
The temperature at which a given solid will melt, a low melting point makes it cheaper to weld as less energy is required.
Card 3
Front
Why are boiling points dangerous in regards to welding?
Back
Card 4
Front
Why can thermal conductivity be an issue?
Back
Card 5
Front
What is high thermal conductivity essential for in welding?
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