DC aluminum welding
To buy technological equipment and consumables for the effective performance of the aluminum welding process by direct current, the company Electrovek-Steel offers. There are good prices from the manufacturer. The supplier guarantees the timely delivery of products to any point specified by the customer.
Technological features of welding aluminum with direct current
The main difficulty in welding aluminum products, regardless of their configuration, is the presence on the metal surface of a thin film of aluminum dioxide, which sharply worsens the quality of the metal in the weld zone. One way to eliminate this harmful effect is to conduct electric welding of products using the reverse polarity of the process. The use of direct polarity is impractical for the following reasons:
- There are difficulties with igniting the arc;
- The arc itself is not distinguished by the stability of its characteristics;
- There is intense spattering of metal, unproductive losses of welding wire are growing;
- Fusion of the wire with the base metal deteriorates, resulting in the seam is uneven and unstable.
When welding aluminum with a direct current of reverse polarity, argon is used, the jet of which completely covers the working area. Therefore, the filler wire is constantly in the bath with liquid melt. The flow rate of argon must be at least 5… 7 l / min. After the end of the process, the working zone is purged, which allows cleaning its surface from the formed slags.
Electrovek-steel company offers to purchase equipment and consumables for welding aluminum with direct current at economically favorable prices from the manufacturer. The supplier provides prompt delivery of products to the address specified by the customer.
Sequence of welding of aluminum with direct current
For the implementation of the method, only those models of welding machines are suitable, in which it is possible to operate in the MIG mode. It is best to use pulse-arc welding. The anode is a welding electrode, and the cathode is a weld metal. In this case, the thermal load on the welded aluminum is sufficient to form a strong weld seam.
The so-called long arc is used, in which the distance between the electrode and the workpiece must be within 15… 20 mm. The welding bath must be completely covered with argon: this not only raises the temperature in the welding zone, but also eliminates the spattering of the metal.
If there are surface coatings from fluoride salts of potassium or sodium on the electrodes, the temperature in the weld zone can be increased even without the use of argon. This mode of welding aluminum with direct current is called MMA; In this case, too, there is a high stability of the arc discharge power characteristics.
Buy at an affordable price snap and consumables needed for welding aluminum products with direct current, offers the company Electrovek-steel. The supplier ensures the timely delivery of products to the address specified by the consumer.