Chemical Energy in Welding-Related Processes. A small number of slides adapted from Prof. F. Lawrence’s Class Notes. Oxyacetylene Process. Acetylene… Density = 0.61 M.P = -81.8 ˚C Colorless, odorless. Produces 6300˚F or 3482 ˚C flame when combust in oxygen.
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A small number of slides adapted from Prof. F. Lawrence’s Class Notes.
Acetylene at first generated as needed because it couldn’t be stored under pressure. Later storage by adsorbing in acetone and sawdust allowed safe storage. Now stored in acetone and porous ceramic core.
Combustion of C2H2
Hottest part of the oxy-acetylene flame just in front of inner cone (blue-white part of flame).
Flame Adiabatic Temperature?
Calculation for other combustible
Absolute hottest flame produced using a slightly oxidizing flame
- Hydrogen has the
highest flame velocity
- Propane and butane
have the highest
heat of combustion
Acetylene does not have the highest heat of combustion (DH) nor the highest burning velocity (V) BUT it has the highest combustion intensity = V x H!
Oxy-acetylene welding is a two-handed process if filler metal is added. Many metals can be welded but the adjustment of the flame and the use of fluxes varies with the metal.
Cutting an edge preparation for welding