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Welding of aluminum by direct current

Welding of aluminum by direct current

Are you interested in welding aluminum with direct current? Supplier Avlob offers to buy aluminum at a bargain price. The supplier guarantees the timely delivery of products to any address in Europe or abroad. Regular customers receive a discount discount. The price is the best in this segment.

Why the reverse polarity 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 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, so that the seam is uneven and unstable.

Protection

When welding with a direct current of reverse polarity, argon is used for protection, the jet of which completely covers the working area. Therefore, the filler wire is constantly in the bath with liquid melt. The rate of supply of argon is not less than 5… 7 l / min. At the end of welding, the working zone is purged, which allows cleaning its surface from the formed slags. Supplier Avlob offers to buy aluminum at a bargain price. The price is the best in this segment of rental.

Technical specifications

It is best to use pulse-arc welding. Models of welding machines operating in MIG mode are used. The anode is a welding electrode, and the cathode is a weld metal. The thermal load on the welded aluminum is sufficient to form a strong weld seam. A long arc is used within the range of 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 spraying of the metal. In the presence of 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.

Delivery, price

Are you interested in welding aluminum with direct current? Buy aluminum at an affordable price from the supplier Avlob today. The price is formed on the basis of European production standards. Supplier Avlob offers to buy any color alloys at the optimal price in bulk or at retail.