Professional welding actually involves expertise and experience. Becoming an expert requires quite a wide range of knowledge. Years of exposure and skills are necessary to master the art of welding. Once you understand the basics, you can learn more complex skills.
First and foremost, safety precautions must be taken. Otherwise, unforeseen situations may even prove fatal. Eyes can be damaged due to the intense beams of light that appear during the action. Since electricity is involved in some welding situations, death may occur due to electrocution. Before starting to weld, helmets must be worn to protect the eyes, hair, head and face. Wearing protective gloves and clothing is a must.
Arc welding.
Arc welding is the most commonly used technique. It is the first lesson in welding. Instead of using a gas torch, high voltage electricity is used. In arc welding, a spark/arc melts the metal and creates a weld. This process is accepted by many because it is more accurate and produces a cleaner and stronger weld. Within the arc welding category, there are seven different methods to choose from.
If you have large welds or metal welded at less than normal angles and positions, shielded metal arc welding may be the most appropriate. In this method, electricity is passed through an electrode using which the metal can be melted. mIG welding (metal inert gas shielded welding) is useful in welding projects where higher speeds are required. In this method, there is no need to use a rod. Instead, equipment must be used that allows current to pass through the tip of the metal that will not melt. Another continuous wire is fed into the tip that forms the weld seam. Tungsten inert gas shielded welding is slightly similar to MIG welding. It is suitable for thin materials that require high quality welding and do not require speed. There are other methods - i.e. Flux Cored Arc Welding (FCAW), Submerged Arc Welding (SAW), Plasma Welding, etc.
Aluminum welding.
Aluminum is the most difficult alloy. Initially, aluminum oxide should be cleaned from the surface. Heat treatable aluminum alloys gain strength through a process called aging. Due to excessive aging, the tensile strength is significantly reduced when welding aluminum. For all additional information on the aluminum welding process, please visit the home page or any of the links associated with it.
Aluminum alloys can be divided into 9 groups.
Name Major alloying elements
1xxx Unalloyed (pure) >99% Aluminum
2xxx Copper is the main alloying element
3xxx Manganese is the main alloying element
4xxx Silicon is the main alloying element.
5xxx Magnesium is the main alloying element.
6xxx Magnesium and silicon are the main alloying elements.
7xxx Zinc is the main alloying element.
8xxx Other elements (including tin, some lithium components)
9xxx Reserved for future use
Aluminum alloys are readily available on the market. We can obtain them in various product forms. The following factors affect the welding of aluminum.
*Aluminium oxide coating.
* Thermal conductivity.
* Coefficient of thermal expansion.
* Melting characteristics.
Other welding methods.
There are several other methods - resistance welding, energy beam welding and solid state welding. All these methods are useful in industrial applications involving large scale and specialized requirements.
So far, we have dealt with only the basic concepts. These are the first lessons or basic steps from which further knowledge about welding procedures can be gained. One only needs to remember a few basic methods. A lot of practice is necessary before reaching a standard of excellence. Some processes will lead to easy results, while others may not. Sooner or later, one will reach a stage and style that is most comfortable for future operations.
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