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Which welder to choose
The welding machine has long been firmly entrenched in everyday life not only professional artists working with metal, but became part of the ” home arsenal ” of tools even in the amateurs . The fact that modern welding long gone beyond merely connecting two metal parts. Modern welding machines enable high precision cut metal, warm up , without damaging , the old fitting and solve a lot of other problems. Buying a welder will be justified in any case, and ” discourage ” already during the first independent work.

However, welding is one of the most costly of all work with metal. So often , paying for work the next welder , the customer thinks that could do the job itself , saving a considerable amount.

But in order to cook , he wants and when he wants , you need a welder . Therefore , it is necessary to go to the store and choose the one most appropriate . And here ‘s the start of: the store dazzled on the range , performance, manufacturers , etc.

Antiquated methods of welding

Despite the wide range of modern welders are in vogue and electrical transformer devices handicrafts . Such transformers are of great weight , inconvenient for transport , very much overwhelmed power grid during the work and consume a lot of electricity . Therefore, most often , for obvious reasons, are connected to a network to counter.

But while such transformers are important and distinct advantage . It is, of course, the price. They are cheap and can make anyone possessing the minimum skills, knowledge and coils of wire .

Inverter welding

The first generation of industrial welding machines called welding rectifiers . They are pretty much loaded with power network building and cost a bit more expensive than the welding transformer . At the same time cook rectifiers was much easier, and increased productivity welder. Therefore, welding rectifiers have gained well-deserved popularity among industries and municipal utilities because of large volumes of welding.

The next step in the development of devices for arc welding has been the development of welding inverter. He became the first truly comfortable and mobile device that could be used in the stationary state (for example, in the shop with a permanent connection to the mains supply with constant voltage ) and a portable version , for example, in the dacha cooperative with mains voltage 150 V .

The principle of operation of the inverter based on the use of high-frequency currents 1000-2000 Hz and higher . To transfer this current need a transformer much smaller size , which means that the device will be light and mobile. The second advantage of modern inverter that welding is performed with direct current. It provides a seal of high quality and visually accurate .

The welding inverter and selection criteria

The simplest inverters constructively carried out the converter , two rectifiers, electric current control circuits and power transistors type MOSFET. When choosing an inverter note whether there are genuine MOSFE- transistors or their next-generation IGBT. Recent work at very high frequencies (up to 80 kHz) and therefore possess the minimum weight .

When choosing an inverter you will come across a lot of Chinese products . The entire lower price segment of the products imported into our country it is from China. But even the expensive European manufacturers of welding machines often use in their devices Chinese accessories . In fact, major differences between Chinese and European inverters less than it might seem at first glance.

The most important parameter is the entire apparatus of the adjustment range of the current . Depending on the tasks assigned to the device , this figure could vary significantly. In the domestic environment and 160-180 amps will suffice and, in industrial welding thick metal and may require twice as much .

Then vote PV - duty cycle . Measured in minutes and it shows how long the device can operate without a shutdown. In order to minimize the risk of overheating and damage of inverter output , manufacturers set different limits of continuous operation. Is considered good if the inverter can be operated for 3 minutes every 10 minutes.

Be sure to see and open-circuit voltage . It employs the principle - the more ( above) , the better. Typically idling is 60-80 volts.

Often have to weld at a certain height or in a remote location where may lack the length of wire appliance if it is installed on the ground. It is therefore very important that the following accessories are included and reliable belt in order to be able to hang the unit on the shoulder and be welded in such places.

Since inverters are very sensitive to the adverse effects of moisture and dust should be monitored prior to buying factory protection class IP23, protects the inverter from getting into the driving rain drops . The presence of such protection does not allow welding in the rain , but only an additional guarantee against electric shock.

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