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Technical Characteristics

The main difficulty in welding aluminum products, regardless of their configuration is the presence of a thin film of aluminum dioxide on the metal surface, which dramatically degrades the quality of the metal in the area of the weld. One way to eliminate this harmful effect is to conduct electric welding of the products using the reverse polarity of the process.

Welding with direct current of direct polarity

Direct polarity is not advisable for the following reasons:

• Difficulties arise in igniting the arc;
• The arc itself is not stable;
• There is intense splashing of metal, unproductive losses of welding wire increase;
• The fusion of the wire with the base metal is deteriorating, resulting in an uneven and fragile weld.

Direct current reverse polarity welding

When welding aluminum using current reversed polarity in the work area is directed a jet of argon, and the filler wire is constantly in a bath of liquid melt. Argon feeding rate should be at least 5...7 l/min. After the process is finished, the working area is blown out, which makes it possible to clean the surface from the slag that forms. The supplier Evek GmbH offers to buy aluminum of domestic and foreign production at an affordable price in a wide range. We provide delivery of products anywhere in the continent. The price is optimal.

Welding machines models

To perform welding with direct current, only those models of welding machines that have the ability to work in MIG mode are suitable. The best way is to use pulsed arc welding. The anode is a welding electrode, and the cathode is the metal to be welded. In this case, the thermal load on the welded aluminum is sufficient to form a durable weld.

Long arc

Applies the so-called long arc, in which the distance between the electrode and the workpiece should be within 15 ... 20 mm. The welding bath must be completely closed with argon: this not only increases the temperature in the welding area, but also eliminates metal splashing.

Surface coatings.

If the electrodes have surface coatings of fluoride salts of potassium or sodium, the temperature in the weld zone can be increased without using argon. This mode of welding aluminum at direct current is called MMA, in this case there is also a high stability of the energy characteristics of the arc discharge.

To buy. Buyer, price.

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