(there's a lot of cool stuff happening)
Oxygen Acetylene Welding (OAW):
Combining combustible gasses from two cylinders and burning them in a torch, whose flame is the location of two stages of chemical reaction, whose heat is used to change the state of metal from up to three different sources from solid to liquid, while having the right balance of the two gases shields the metal from atmospheric contamination, and weld technique is affected by distance, travel angle, work angle, speed and heat (quantity of gas, diameter of torch tip). If the weld is overhead, the force of surface tension of molten metal resists gravity.
Arc Welding (AW):
Completing an electrical circuit by shooting a molten-metal-filled lightening bolt whose temperature is as hot as the surface of the sun, to several pieces of structural steel that have also been made a part of the electrical circuit.
many chemical reactions
changing state
fusion of metal
torches
gasses
metalurgy
heat
light
electrical circuit
lightening
motion
shapes
sizes
strength
direct current
alternating current
