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# welding technology

### Welding Technology

Boiling Point the temperature at which the metal changes from liquid state to vapor state
thermal conductivity a measure of the rate at which heat will flow through a material
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
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
specific heat a measure of the quantity of heat required to increase the temperature of the material by a specific amount
thermal expansion the increase in the dimension of a metal caused by heat
coefficient of linear thermal expansion is a measure of the linear increase per unit length based on the change in temperature of the metal
stress the force or load being transmitted, divided by the cross sectional area transmitting the load--s=f/A
strain the internal reactive to stress or applied force
yield point the point at which there is appreciable elongation without a corresponding increase in load. we use yield point to determine yield strength
ultimate strength highest ordinant on a stress strain curve--tensile strength or highest strength
full penetration weld metal throughout the entire cross section of the weld joint
partial penetration has unfused areas
allowable working stress maximum stress level that is allowed anywhere within the weldment--allowable welding stress, allowable unit stress, and allowable weld stress
strength the ability to withstand the action of external forces without breaking
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
hardness the resistance of a metal to local penetration by a harder substance
impact strength the resistance of a metal to impact and is determined by measure the energy absorbed in the fracture
single stage regulator indicates a pressure drop as the cylinder content is consumed--1000psi=10psi, 900psi=9psi
2 stage regulator maintains steady outlet pressures and flow rates during long periods of operation--1000psi=10psi, 900psi=10psi
jump a momentary pressure increase when the torch valves are closed
creep the working pressure side of the regulator increases to unusually high level after the torch valve is closed
reverse flow check valves allows the gas to flow in one direction only
flash back arrestor during a flashback, a filter stops the flame and activates a gas shut off valve--common occurence in cutting projects
manufacturing processes unfinished materials and converting into a finished product
Created by: nancyms