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Option 3 : Thermit welding
In thermit welding, heating and coalescence is by superheated molten metal obtained from a chemical reaction between a metal oxide and a metallic reducing agent. In the mixture one part of aluminum and three parts of iron oxide are used and ignited by a magnesium fuse. Temperature around 2750°C produced in 30 seconds, superheating the molten iron which provide both heat and filler metal.
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