How to choose a welding machine?
To date, welding machines are very popular. This is not surprising, because in the process of operation of this apparatus, the density of the welding current increases, in contrast to automatic welding. A person who decides to do body repair will be faced with the need to purchase an automatic welding machine. How to choose it and what you need to focus on - we now analyze.
First of all, you need to determine the place where the work will be carried out, as well as its volume. Versatility is the main feature of a semi-automatic welding machine, when compared with the same usual welding transformer. They can cook cast iron, stainless steel and carbon steel, aluminum and other metals. Manufacturers offer a wide range of semi-automatic welding, with different characteristics, prices and functionality.
Selection of welding machine
How to choose a semiautomatic device, and what are the main criteria for choosing it? First you need to determine what the maximum current strength of your equipment will be.This parameter is the basis for each semi-automatic welding. The strength of the current determines the thickness of the metal you are welding. The magnitude of the welding current is directly dependent on the thickness of the selected metal. Below we give the dependence of current and thickness:
- 1.5 mm requires a current of 35-50 A;
- 2 mm consumes 45-80 A;
- 3 mm takes 90-130 A;
- 4 mm consumes 120-160 A;
- 5 mm will take 130-180 A.
In a semi-automatic welding machine, the current adjustment can be smooth and discrete. With the help of smooth you can choose the most accurate amperage.
Next, we need to determine the power settings. If there is a single-phase voltage of 220 V, the device you choose must be connected to a single-phase network. When choosing such equipment, you need to pay attention to the supply voltage range, since it covers the possible surges in the network. As a rule, if there are fluctuations whose limits do not exceed 15%, then the welding semiautomatic device continues to function normally. Choosing the power of the welding machine, the power settings should also be taken into account. Not all networks withstand power in excess of 5 kW.
We turn to the intensity of the work of the semi-automatic.We should not forget that most of this equipment is designed for short-term and repetitive modes. After five minutes of welding, a short pause should be made. And then you can get back to work.
In order to decide which semi-automatic device to choose for oneself, one also needs to take into account the degree of universality of the selected apparatus. Some models can only work with powder (electrode) wiring, which does not need gas. A universal model, make it possible to work with the use of stick electrodes. And they are much more expensive than those that work without gas.
Types of semi-automatic
Today the following types of semi-automatic welding machines are on the market: inverter and conventional. The invertor device is more convenient in operation, and it is better on quality of the carried-out welding. The burning of the arc of such equipment is much more stable, because there is a more accurate adjustment of the current. It is equipped with a hot start (Hot start and Anti-Stick functions) and a system for preventing sticking of electrical wires, as well as a thermostatic overload protection. Inverters are much smaller in size, so if you are not short of money, it is better to give preference to such a semi-automatic.
Do not forget about the weight and compactness of welding equipment, because the convenience in the process of work directly depends on it. The welding machine can be a light one-body or two-body. When purchasing a semi-automatic welding machine, you should pay attention to the speed of preparation for work, as well as how convenient the wire feed speed and the adjustment of the strength of the welding current are. We should not forget about the manufacturer. The most reliable are semi-automatic, made in Western firms, for example, Italian. No one can safely assert that cheaper Chinese semi-automatic devices are significantly inferior to Western competitors, but neither should one discard possible risks.