Why choose square wave AC /DC argon arc welding machine for welding aluminum parts?
Because aluminum has two characteristics:? First, heat conduction is fast; Second, it is easy to oxidize at high temperature;
Then, when welding, due to the fast heat conduction of aluminum, when welding a certain area of aluminum, the surrounding area will be heated up, and then the area will be rapidly oxidized to form a dense aluminum oxide film; This kind of thin film is very annoying, which will hinder the further formation of welding arc, thus causing welding failure (arc breaking) or welding quality degradation (incomplete penetration);
So, why can WSE adapt to this feature?
First, WSE output can be set as AC output; The output frequency of the welder can be set, the magnitude and positive and negative directions of the forward output current and the reverse output current of the welder can be set, and the time ratio of positive and negative output can also be adjusted; The forward output and reverse output of welding current and their proportion in output time are all useful to cope with (adapt to) the oxidation degree of non-ferrous metals during welding. This function of welding machine is explained in the following two points. )
In addition, argon is an inert gas, and its existence also effectively prevents the further oxidation reaction between oxygen molecules in the air and aluminum;
The general details of the process are as follows: during the welding process, the welder outputs a reverse current pulse to "destroy" the oxide film on the aluminum surface; ? At this time, a positive current pulse is output to perform "fusion welding" action; Such positive and negative cooperation can form (maintain) a continuous and stable welding process;
The following figure can help you understand the technical terms mentioned in point 4: