Oxy-Acytelin Welding

There are many components that make up an oxy-acetylene out fit.

•         Cylinders.

•         Regulators.

•         Hoses.

•         Torches. (welding & cutting)

•         Tips.

•         And your PPE.

 

CYLINDERS

•         Cylinders should be checked regularly with date of the last test stamped on the top of the cylinder.

•         Always stored in the up right position.

•         When not being used, the valve cap should always be in place

Basic of Air Conditioning

PRINCIPLES OF COOLING

Heat Transfer

 Heat is a form of energy. Every object on earth has some heat energy. The less heat an object has, the colder we say it is. Cooling is the process of transferring heat from one object to another. When an air-conditioning system cools, it is actually removing heat and transferring it somewhere else.

 

SENSIBLE AND LATENT HEAT

There are two forms of heat energy: sensible heat and latent heat.
Sensible heat is the form of heat energy which is most commonly understood because it is sensed by touch or measured directly with a thermometer. When weather reporters say it will be 90 degrees, they are referring to sensible heat.
Latent heat cannot be sensed by touch or measured with a thermometer. Latent heat causes an object to change its properties. For example, when enough latent heat is removed from water vapor (steam or humidity), it condenses into water (liquid).

 

Arc-Welding

ARC WELDING

Definition

•         ARC Welding process has the advantage of being relative simple only requiring a power supply, power cables and electrode holder.

•         It is commonly used in construction and jobbing shops.

•         The basic arc-welding circuit fitted with is connected by a work cable to the work piece and by an electrode cable to an electrode holder, which takes the electrode and when contact is made to the work piece the circuit  is complete.

•         An arc is created across the gap and the electrode tip touches the work piece and is withdrawn, yet still remains in close contact.

•         The arc produces a tempeture of about 6500 deg F at the tip.  This heat melts both the base metal and the electrode, producing a pool of molten metal.  The result is a fusion bond.

•         Ensure that your job is well guarded so others do not receive a flash from the welding, also slag from the chipping hammer