What is Transformation in Welding?
Welding is a process of joining two pieces of metal together by heating them to a high temperature and then cooling them. During welding, the metal undergoes a process called transformation, where its crystal structure changes. This change in crystal structure makes the welded joint stronger than the original metal.
The amount of transformation that occurs during welding depends on:
- the type of metal being welded,
- the welding process,
- and the amount of heat used.
At what temperature does the transformation occur?
For most metals, transformation starts to occur at around 700 degrees Celsius. At this temperature, the metal begins to melt and its molecules start to move around. As the temperature increases, the molecules move faster and the metal becomes more liquid.
At around 1000 degrees Celsius, the metal is completely molten and its molecules are moving very rapidly. At this point, the molecules can rearrange themselves into a new crystal structure. As the metal cools, this new crystal structure becomes permanent.
The type of transformation that occurs during welding is called solid-state transformation. This is because the metal changes from a solid state (the original metal) to a liquid state (molten metal) and then back to a solid state (the welded joint).
The amount of transformation that occurs during welding can be controlled by the welder. By adjusting the amount of heat, the welding speed, and the type of metal being welded, the welder can control how much transformation takes place.
- Too little transformation can result in a weak welded joint.
- Too much transformation can make the welded joint brittle and more likely to break.
- The ideal amount of transformation is called the balance point, where the welded joint is strong but not too brittle.
What are the 4 basic welding techniques?
The four basic welding techniques are:
- Oxy-fuel welding.
- Arc welding.
- Resistance welding.
- Laser beam welding.
What is the MMA welding process?
MMA welding is a type of arc welding. It uses an electric arc to heat the metal and create the weld. MMA stands for the manual metal arc. In MMA welding, an electrode (a rod of metal) is held in the hand of the welder. The other end of the electrode is connected to an electrical power source.
What machine is used for TIG welding?
A TIG welder is a machine that uses an electric arc to heat the metal and create the weld. TIG stands for tungsten inert gas. In TIG welding, a tungsten electrode is used to create the arc. The electrode is not consumed during the welding process like it is in other welding processes.
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