Welcome to MIG welding Tips for beginners,there are several ways to learn the basic of welding like reading books ,watching videos and join a workshop but the best way to learn is by actually weld it self.
We start with the basics. Welding is the process of joining between two or more pieces of a material , usually metal or thermoplastic. This fixation process is achieved through fusion (also called coalescence).
In this process the pieces that we want to weld are melted when we apply high temperatures and pressures creating a kind of cord between them.
When welding we will need energy to join the different materials and there are several types of energy sources, the most common are: the electric arc, gas, electron beam, laser and friction processes, but there are many more that we will see later.
Stay with that when we join metals, at least in most cases, the energy comes from the electric arc and when we fuse thermop lastics the energy comes from the gas that emanates.
Types of welding
Welding with electrodes (MMA)
Manual arc welding with coated electrodes is the most common form of welding. The abbreviated denomination MMA(manual metal arc welding) is usually used .
Arc welding with a coated electrode is a process in which the fusion of the metal occurs thanks to the heat generated by an electric arc established between the end of a coated electrode and the base metal of a weld joint.
The material of contribution is obtained by the fusion of the electrode in the form of small drops. The protection is obtained by the decomposition of the coating in the form of gases and in the form of liquid slag that floats on the melting bath and subsequently solidifies.
The welding TIG is characterized by the use of a permanent electrode. Given the high temperature resistance of tungsten (melts at 3410 ° C), accompanied by gas protection, the electrode tip barely wears after prolonged use. The most commonly used gases for arc protection in this welding are argon and helium , or mixtures of both.
The great advantage of this welding method is, basically, the obtaining of more resistant, more ductile and less corrosion- sensitive cords than in the rest of the procedures, since the protective gas prevents contact between the oxygen in the atmosphere and the melting bath Another remarkable advantage of the TIG process is that the temperature can be controlled very precisely and therefore the welding can penetrate steels of great thickness and is ideal for welding beveled joints that need high precision because they are joints that will be subjected to great efforts mechanics
It allows to obtain clean and uniform welds due to the shortage of fumes and projections; The mobility of the gas surrounding the transparent arc allows the welder to clearly see what he is doing at all times, which has a favorable impact on the quality of the weld.
Nowadays, the use of TIG welding is being generalized, especially in stainless and special steels, because despite the cost of this welding, the technological requirements regarding quality and reliability of welded joints, make it necessary to adopt new systems, standing out among them TIG welding.
MIG / MAG welding
The MIG / MAG welding (Metal Inert Gas or Metal Active Gas, depending on the gas to be injected) The arc is produced by an electrode formed by a continuous filler wire and the pieces we want welding, protecting it from the surrounding atmosphere by a inert gas (MIG welding) or by an active gas (MAG welding).
We will use it to weld aluminum, stainless steels and conventional steels.
This type of welding unlike the TIG releases more projections when it is working and as a result it is a dirtier weld, yet the advantage is that very long cords can be made because the thread is continuous. It is more suitable for thick plates.
What is MIG welding?
What is known as MIG, is gas arc welding (GMAW) . The electrode forms an arc with the metal to be welded, and thus melts, melting with the material.
The MIG welding process has a protective gas bubble , to protect the welding of the air components.
In addition, the pieces that are welded do not fuse, since the welding is fed with another material, and this makes it possible to weld different types of materials . Both the electrodes and the gas that are used have to be replaced as they are spent.
What is MIG welding used for?
MIG welding has various applications , and both thick and thin metals can be welded with this method .
But for this, a good MIG welding machine will be necessary , so that it allows to adjust the power, to be able to weld very thin and thin materials, and at the same time also weld thick steel materials.
Advantages of MIG welding
The biggest advantages of MIG welding are the following:
Easy to use and control the machine , recommended for beginners, since it only has one gun to learn to control.
It can be used in a wide range of thicknesses.
Aesthetically pleasing finishes .
It can also be used for sculpture .
Disadvantages of MIG welding
However, it also has some disadvantages that must be taken into account:
The materials that can be welded are a bit limited : it is weak for cast iron and too strong for thin aluminum. The same goes for material that is too thin or too thick.
It cannot be used on dirty or rusty materials , they have to be clean.
It cannot be used in wet conditions , as it is a somewhat delicate process.
How to do MIG welding?
The mig welding is a welding process by electric arc with consumable electrode in which an inert gas serves as a protector against the influence of the surrounding atmosphere. In fact, it is named by the acronym in English: metal, inert, gas , although it is also called gmaw ( “gas metal arc welding” or “gas welding and metal arc”). On the other hand, its use has been revealed much more productive than the traditional or mma. And, when it comes to welding very alloyed steels, aluminum, titanium or nickel-based magnesium, it is also better than mag or active gas welding.
How is the MIG welding procedure
This mig welding process has numerous advantages, most notably two: the quality of the final finish and the high productivity it allows. In addition, it can be done automatically. And this leads us to the three basic procedures that exist in this type of welding and which are the following.
It can only be done with wire welding. In it, the intensity and voltage are adjusted by the operator according to the values necessary for the work to be done and it is the equipment itself that regulates them. For its part, welding is applied by an automated nozzle. Consequently, it requires very little participation of said operator.
Like the previous one, it can only be done with wire welding and the voltage and intensity parameters are previously adjusted so that they are automatically regulated. However, unlike that, it is the worker who manually drags the welding gun.
It is the most common system and in it the tension is fundamental: the higher the voltage, the more the weld will penetrate.
For its part, the intensity is responsible for controlling the output of the electrode, in such a way that, the higher this is, the thicker cords will be produced and, consequently, larger joints will be filled. Finally, although it is the voltage itself that provides stability to the arc, it is convenient that the operator avoid sudden movements and keep the gun about 7 millimeters from the piece.
It is used in industrial scale welding. In fact, in this procedure everything is programmed by a CNC unit or numerical decimal control. Thus, a mechanical arm is responsible for welding the piece, making the finishes and even transporting it, all automatically and, consequently, without any operator having to intervene.
Benefits of welding work
The main advantage of welding in general, is that it allows the repair of elements that otherwise should be discarded and replaced by a new one, as is the case of metal structures that, if broken or cracked, can be welded to obtain a high level of resistance and durability to different types of efforts, extending the life of the structures.
Check out more of its benefits:
Depending on the type of welding machine to use, different types of finishes will be achieved.
The welding offers the benefit of having solid structures to build on it, such as buildings, houses, hotels, among others.
It has the facility to clean the waste and fill spaces that require it.
To obtain a good fusion and to carry out the welding , it is possible to appeal to a laser, to the ultrasound, to a flame generated with gas, to the electric arc or to a friction process, to mention some of the available options.
Tips to improve MIG welding
Learning to weld is something quite basic when making any project that needs metal bonding, and with the growing trend of DIY (do it yourself for its acronym “do it yourself”). It is essential to learn how to do it well in order to optimize not only the time but the cost of the projects we plan to finish, but we understand that trial and error is a fundamental part and that different factors are required for welding to have an ideal result, so don’t be alarmed if at the beginning it works out well.
Everyone learns from their own experience, but it is always good to have a guide that will help us to walk through that field un18known to us, and it is for this reason that we present now these tips that will help you get a good weld with the Best quality and the best finishes.
First of all you should always be aware that the welder is hot, which may seem obvious, but in reality it is a common mistake of many beginners in welding .
You should also ensure that everything is well fixed at the time of welding so that they do not move by mistake and the finish is bad.
Always regulate the power of your welder so that the metal can melt optimally, making the process faster and easier.
The welder should have a fine tip for optimal welding .
If you are going to weld with tin, make sure it does not have a high melting temperature. You can get help at this point with the merchant who supplies you with the material.
All surfaces where you are going to weld must be clean.
Finally, remember that tin should not touch the welder . Simply approach it.