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CONTRIBUTION IN ALUMINUM WELDING

aluminum alloys arc welded under inert gas (argon, helium or a mixture of both) and there are two techniques:

ARC WELDING ELECTRODE inert atmosphere REFRACTORY OR PROCEEDING WITH TIG (Tungténe Inert Gas).

This procedure is blown arcing between a tungsten electrode and refractory workpiece, while a stream of inert gas (usually argon) surrounding the electrode, protecting the melt against oxidation.
A filler rod (usually fastened by hand) fed the bathroom.

This procedure uses an alternating current source. It is used in thicknesses between 1 and 6 mm and can be automated.


Long Pulse Welding

Many energy sources are capable of TIG welding pulse. For others you can easily connect an additional drive. The principle is similar to MIG welding - pulse, with the only difference being that the solder TIG is carried out with a much lower frequency, approximately 10 Hz This means that the pulses are clearly visible which can be a source of limitation for the welder. The technique can be applied to welding with AC as DC. It works with two current levels. The lowest is chosen to not turn off the bow. The highest level is generally higher than in normal TIG welding. Periods of different levels may vary. The advantage is that you can get a perfect weld with an average current intensity of lower than normal solder. The heat input is lower and you can weld thinner material: 0.3 to 0.4 mm. With the combination of CC and pulse can be welded thickness of about 0.05 mm.


ARC WELDING IN INERT ATMOSPHERE OR PROCEEDING WITH CONSUMABLE ELECTRODE MIG (Metal Inert Gas)

This welding process, the aluminum or aluminum alloy serves both electrode and filler metal. Supplied in pre-coiled wire into a coil, which automatically unrolls to the welding tool as it is consumed.
welding energy is supplied by a DC source. The connection is made with reverse polarity in part to ensure the melting of the electrode wire.

This procedure, used for products with a thickness exceeding 2.5 mm., is also automated. The manual version is commonly called MIG welding semi-automatic.

In recent years, manufacturers of welding material proposed pulsed power sources. This equipment can weld thin thickness of 1.5 to 4 mm. easily. For media thickness and thick, its advantage over the classical sources is demonstrated.


MIG welding thick material

The recent use of thick aluminum, alloy particularly AlMg, 5mn, has led to the development of a technique, specially adapted for this purpose, based on the MIG method.
You can mention the method of Sciaky NARROW GAP, which stands obliquely placed one after the other allows the butt welding without edge preparation and an opening of 6-9 mm. for thick materials. In Japan has developed the method NHA (HORIZONTAL NARROW GAP welding process for aluminum) for horizontal openings. A double glass torch swinging motion is automatically guided along the joint. The advantages of these two variants in the best MIG involve use of heat and the smaller size of the board, leading to an increase in productivity. Table


recommended amps for MIG

diameter Current thread (A)
0.8 mm from 80 to 140
1.2 mm 120 to 210
1.6 mm 160 to 300
2.4 mm 240 to 450

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WHAT IS THE WELD?

Welding is a process where union is made of two materials, usually achieved through fusion, in which the parts are welded by fusing the two and adding a molten filler material (metal or plastic), which has a melting point lower than the piece welding, to get a bath of molten material (called the weld) which, when cooled, becomes in a strong union.

Sometimes the pressure is used in conjunction with heat, or by itself, to produce the weld, which contrasts with the soldering, which is the melting of a material of low melting point, between pieces of work to form a bond between them, without melting the workpieces.

Many different energy sources can be used for welding, including a gas flame, an electric arc, laser, electron beam, and friction or ultrasound.

The energy required to form the joint between two pieces of metal usually comes from an electric arc, while the energy for welding merger or thermoplastic usually comes from direct contact with a tool or a hot gas.

While it is often an industrial process can be welded in many different environments, including outdoors, underwater and in space. Regardless of the location. Even this, welding remains dangerous, and should take precautions to avoid burns, electric shock, poisonous fumes, and overexposure to ultraviolet light.