When purchasing equipment for welding, people often wonder if aluminum can be welded with a semiautomatic device. It is possible that over time you will need to weld aluminum parts. Therefore, it is advisable to immediately learn about the capabilities of a particular unit.
The process of electric welding of aluminum.
If we generalize the welding of aluminum, it turns out that this type of work is somewhat different from that performed with steel. You will need special equipment and some skills. It is necessary to carefully study the technology of how to weld aluminum. Only after a detailed study of the process and the acquisition of the necessary details, you can proceed directly to work.
Aluminum welding semiautomatic
Diagram of the process of aluminum welding semiautomatic.
Semi-automatic welding of this metal involves the use of special wire. She also served to the place of welding through the sleeve with a gun. Submission takes place with the help of rollers. If you have experience in welding steel using a semi-automatic machine, you need to change the approach a little.
Aluminum is a soft metal, so the welding wire should be fed somewhat faster than when working with other substances. He has a very good heat. This property leads to the need to weld aluminum at a higher current to form an ideal seam and a sufficient degree of boiling. Gradual reduction of electrical impulses during work is allowed. Boil aluminum using a large current is much easier and requires much less effort.Back to table of contents
Selection of equipment and materials for aluminum welding
Semi-automatic welding of metal with a large thickness requires the use of a powerful apparatus.
For regular welding, it is recommended to purchase a semi-automatic with a capacity of at least 200 A.
Characteristics of aluminum.
An excellent choice for welding aluminum will be equipment with a pulsation mode. Thanks to him, you can easily break through the film, which is a consequence of oxidative processes. Also, the pulsed mode prevents overheating of parts and helps to eliminate their burning. This type of welding can produce a high-quality weld.
For aluminum boiling with a semiautomatic device, a protective gas is needed, which consists of argon in pure form or with an admixture of helium. This is a significant difference from working with steel that requires the addition of carbon dioxide. If the gearbox and regulator are designed for CO2, then their replacement is necessary.
One of the materials that you should stock up on is aluminum wire. When using a rod of 0.8, it is recommended to select a nozzle with a diameter of about 1. This is due to the strong expansion of the metal when heated. This indicator for aluminum is much higher than that of steel. At contact tips, the size should also be slightly larger than usual.
Feed rollers should have U-shaped grooves. The usual V-type for aluminum welding is not suitable. The device, which has a mechanism with four rollers, is considered an ideal option for such work. The supply of rods when cooking aluminum with a semiautomatic device must exceed the standard for steel. It is necessary to take into account all these nuances to prevent damage to the soft material by the semiautomatic device. The use of a graphite or teflon cable channel helps reduce the friction of the aluminum rod.
Welding Gorenka also deserves attention. For a soft aluminum rod it is recommended to use a straight hose, the length of which does not exceed 3 m.Back to table of contents
Aluminum welding technology
Modes of welding aluminum tires with a non-consumable electrode in argon.
The cooking process must occur while maintaining a constant arc. For this metal, its length is 1.2-1.5 cm. At smaller sizes, burn-through metal is possible, and the excess is fraught with the absence of fusion. These parameters depend on the composition of the alloy itself and its thickness.
The technology of aluminum welding with a semi-automatic machine is as follows:
- Aluminum wire is tucked into the machine by pulling through the feed mechanism to the burner.
- The supply of electricity is adjusted in a semiautomatic device.
- Connect the balloon with pure argon or an admixture of helium.
- Prepare the part for the cooking process.
- Melting of the crater begins at the junction of parts with a gradual filling with liquid metal.
- Brewing deepening stream of aluminum to form a seam.
The supply of electricity must be set to reverse mode, in which the minus goes to the part itself, and the plus is connected to the electrode. In the presence of thick parts, it is recommended to use a mixture of argon and helium. For a thin-walled material, the first type of gas in its pure form is quite suitable.
Part preparation is accompanied by cleaning and degreasing the surface at the joints. With the formation of very strong pollution to the balloon with argon is added 3% oxygen. This method will lead to the burning of dirt during the welding process.
Boiling crater begins at the joints. He breaks through using a pulsed electric current. There is simply no other way to break through a film that is subsequently formed by oxidation reactions. Then the crater is displaced with a burner and filled with molten metal flows, which is obtained from the aluminum rod. Properly made indentation in its form should resemble a drop.
At the end of the welding, the seam must be completely welded with molten metal. It cools to 400 ° under constant argon blowing. If this is not done, then the appearance of an oxide film on the surface is possible, which will reduce the strength of the weld.