WELDING THEORY - OD1650 - LESSON 1/TASK 1
FIGURE 1. MASTER CHART OF WELDING
PROCESS.
Heat. The welding processes differ depending on the source of heat, the manner in which
b.
the heat is applied or generated, and the intensity of the heat. The source of heat may be the
combustion of a fuel gas such as acetylene or hydrogen, in air or in oxygen; an electric arc; an
electric, gas, or oil furnace; the resistance of metal to the flow of electric current; or a chemical
reaction between a metal oxide and finely divided aluminum.
The intensity of heat applied or generated at the joint varies according to the welding process
used. All welding, processes except brazing use temperatures high enough to melt the base
metals.
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