The welding machines with automatic presetting are within the trend of welders operator friendly, since it allows us to adjust the parameters of welding without the need to resort to chart notebooks or costly trial and error sessions. It is on this topic that we will talk in this technical article.
There are many types of welding with these tendencies, and among them are synergic welders. Also, we saw that they allow us to automatically obtain the necessary welding parameters according to the type of material and the diameter of the electrode.
How are the welders with automatic presetting?
In a similar way to the synergic welders, the welding machines with automatic presetting adjust those parameters by focusing primarily on the electrode diameter and secondarily on regulating the current intensity level for that particular electrode diameter. Thus, not only the memorization of the most common configurations is simplified but also it becomes easier to prepare work orders and process letters. In other words: it is much easier to reproduce the same results at different times and with different operators.
These equipments have an IGBT switch (or transformer), which allows saving in weight, size and electrical consumption, and at the same time achieve a very precise control of the working parameters.
The control system is extremely simple and ideal for novices, since it allows limiting the electrical current according to the useful range for each electrode diameter; at the same time, an additional option allows to regulate the electrical current independently.
Its processor constantly monitors the weld to minimize spatter and to prevent sticking of the electrode to the material, compensating in real time for the force of the weld for consistent results.
What are they for?
Many welders Inexperienced novices fail to find the proper voltage and current parameters for a given material and electrode. This produces considerable economic losses if it is a metallurgical workshop, or at least frustration in the operator if it is only a hobby or sporadic use.
The welding machines with automatic presetting they eliminate this initial hurdle by allowing novice welders to start production almost immediately, with results consistent with each other, and with only minimal sewing and safety training.
Although it is a piece of equipment aimed at novice or inexperienced users, its use is also ideal for advanced operators since the preparation of the equipment takes only seconds.
What kind of materials can be welded with this equipment?
Being MMAW welders, practically any ferrous material: carbon steel, steel alloys, stainless steel, cast iron and soft iron. It is also possible to weld nickel, copper and, to a lesser extent, aluminum.
The electrodes available for this technique can be acid or basic covered; This, together with the possibility of reversing the polarity of the electrode, allows practically any work of welding by sewing without a protective atmosphere, with a lower limit of thickness of approximately 1.5 mm.
How do you operate these welders?
The operation is very simple: once the welder and the electrodes (clamp and electrode holder) are connected, the central button is pressed until the diameter of the electrode to be used is selected. Then the dial is turned looking for the necessary amperage. Once that parameter is found, you can start welding.
For a traditional working mode, the central button is pressed until none of the electrode diameter options light up; at that moment the dial will allow you to choose the amperage freely, from the minimum (generally 10A) to the maximum (500A in most machines).
If it is necessary to work with a basic electrode, it is recommended to connect the electrode holder clamp to the positive (+) terminal. For work with acid electrodes, the choice of polarity is at the discretion of the welder, although it is recommended to always work with the positive pole on the electrode.
If the equipment overheats (for any reason), the thermal protection will be activated, indicated by an LED on the board, next to an icon symbolizing a thermometer. It is necessary to wait for the temperature to normalize to continue working.
The welder it has an internal processor that evaluates the conditions of the electrical current at all times; if this processor detects the adhesion of the electrode to the material, it will immediately cut off the flow of current in order to allow its safe removal. This technology is called “anti stick”.
Hot-Start technology establishes the initial conditions to start cold welding; this results in a greater economy of consumables, since it is not necessary to make previous seams to heat the electrode.
Lastly, the same processor monitors the distance from the electrode to the material and increases or decreases the voltage and current to make the seam as even as possible.