Welding Technology
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Boiling Point | the temperature at which the metal changes from liquid state to vapor state
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| thermal conductivity | a measure of the rate at which heat will flow through a material
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| K-value | the amount of heat (in BTU's) transfered in one hour through 1sqft of a given material that is 1 inch thick and has a temperature difference between its surface of 1 degree farenheit--also called the coefficient of thermal conductivity
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| R-value | represents the resistivity or resistance which is the reciprocal of conductivity or conductance. A good insulation material will have a high R-value. R=1/K
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| specific heat | a measure of the quantity of heat required to increase the temperature of the material by a specific amount
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| thermal expansion | the increase in the dimension of a metal caused by heat
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| coefficient of linear thermal expansion | is a measure of the linear increase per unit length based on the change in temperature of the metal
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| stress | the force or load being transmitted, divided by the cross sectional area transmitting the load--s=f/A
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| strain | the internal reactive to stress or applied force
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| yield point | the point at which there is appreciable elongation without a corresponding increase in load. we use yield point to determine yield strength
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| ultimate strength | highest ordinant on a stress strain curve--tensile strength or highest strength
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| full penetration | weld metal throughout the entire cross section of the weld joint
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| partial penetration | has unfused areas
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| allowable working stress | maximum stress level that is allowed anywhere within the weldment--allowable welding stress, allowable unit stress, and allowable weld stress
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| strength | the ability to withstand the action of external forces without breaking
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| ductility | a characteristic that allows a metal to be stretched or otherwise changed in shape without breaking and to retain the change shape after the load has been removed
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| hardness | the resistance of a metal to local penetration by a harder substance
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| impact strength | the resistance of a metal to impact and is determined by measure the energy absorbed in the fracture
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| single stage regulator | indicates a pressure drop as the cylinder content is consumed--1000psi=10psi, 900psi=9psi
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| 2 stage regulator | maintains steady outlet pressures and flow rates during long periods of operation--1000psi=10psi, 900psi=10psi
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| jump | a momentary pressure increase when the torch valves are closed
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| creep | the working pressure side of the regulator increases to unusually high level after the torch valve is closed
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| reverse flow check valves | allows the gas to flow in one direction only
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| flash back arrestor | during a flashback, a filter stops the flame and activates a gas shut off valve--common occurence in cutting projects
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| manufacturing processes | unfinished materials and converting into a finished product
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Created by:
nancyms
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