Detailed Explanation Of The Heat Affected Zone In Welding & Cutting. 

The heat-affected zone is the portion of the base metal that was not melted during welding or thermal cutting but has changed properties.
The heat affected heat-affected outside the fusion zone of the welded joint, which is affected by the welding treatment.
▶ Colours of the heat-affected zone.
During the welding and thermal cutting, there is a series of colored bands that extend some distance across the heat-affected zone.
These different colors vary from light yellow to dark blue and are an approximate indication of the temperature reached by the metal.
▶ Microstructure of the heat-affected zone.
The heat-affected zone is a heterogeneous zone, which is divided into different subzones.
▶ Causes of heat-affected zone.
The main cause of the heat-affected zone is heat. The amount of heat input during the welding or cutting process.
▶ Size of the heat-affected zone.
The width of the heat-affected zone depends on factors like thermal diffusivity and choice of cutting methods.
▶ Effects of heat-affected zone.
A metal's mechanical properties such as fatigue, resistance, distortion, and surface cracking are affected. These changes may give lower strength, susceptibility to cracking, reduced corrosion resistance, or lower toughness.
▶ Controlling of the heat-affected zone.
It is impossible to eliminate the heat-affected zone. Reduction is the better option for controlling heat-affected zones.
By reducing and improving the microstructure of the heat-affected zone, the properties of the welded joint will improve.
▶ Conclusion.
The formation of the heat-affected zone has a considerable effect on the quality of the final product. For this reason, it is good to understand the different aspects of it and control its effect.
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