How to choose a semiautomatic device welding

Welding apparatus is an indispensable thing in every garage. But since technologies are not standing still, but all the time they are rapidly developing, the old devices were replaced by welding semiautomatic devices. Why exactly a semiautomatic device? And all because even though the device does most of the work itself, you still can not do without the help of the welder. After all, he must direct the burner to the necessary place, press the trigger and release it at the end. In modern welding machines, the MIG-Mag welding method is used, which forms an electric arc between the melting welding wire and the material that is welded.