What welding can be used to weld aluminum 30

AC tungsten argon arc welding.

The polarity of the alternating current is periodically transformed, which is equivalent to half of the wave being DC forward and half of the other being DC reverse in each cycle. During the positive half-wave, the tungsten electrode can emit enough electrons without overheating, which stabilizes the lion arc.

The oxide film generated on the surface of the workpiece during the half-wave of reverse jointing can be easily cleaned off to obtain a weld with a bright and beautiful surface and good forming. In this way, taking into account the cathodic cleaning effect and the effect of less tungsten electrode burning loss and good arc stability, AC argon arc welding is generally selected for metals and alloys such as aluminum, magnesium, aluminum bronze and other metals with strong activity.

Different welding methods are used for the welding of aluminum, and different welding materials need to be selected, which is also based on the structure and size of the welded aluminum parts, and the specific welding requirements.

1. Argon arc welding is commonly used, and the welding wire is 4 series, 5 series, and 6 series.

2. The low-temperature M51 with M51-F welding wire is operated in the environment of 179 degrees of working temperature, which has a good affinity for the welding materials of the system, and is mostly used for welding with particularly strict requirements for deformation control or particularly thin conditions.

3. WE53 low-temperature aluminum electrode for the welding of 7 series of aluminum alloys, the welding working temperature is 380-400 degrees, the advantage is that there is no need to assist any flux welding when welding, so as to prevent some flux residue in the welding process, and the welding strength is very high, which can solve the welding of 3 series aluminum alloy and castings, or die castings.

4. Q303 low-temperature aluminum welding wire also reflects some special advantages for the weldability of aluminum alloy, which is the narrow gap welding with a poor angle.

There are special welding machines, generally using tungsten argon arc welding or aluminum wire welding.

Aluminum is generally welded with aluminum argon arc.

If it is a small repair factory, or a special welding store, or mainly repairing or processing small aluminum alloy parts, it is highly recommended to use aluminum argon arc welding, rather than pulse gas shielded welding.

Because the control of the quality and detail of the weld output of aluminum-TIG welding is not possible with the output of the pulsed gas shielded welding machine.

If it is a batch of large-thickness aluminum sheet welding processing, or a batch of structural parts processing, in addition to the strength requirements for the quality of the weld, other requirements are not high, it is suitable for double pulse gas shielded welding.

Precautions for welding aluminum:

Before welding, we need to understand the properties of these materials. Thermal conductivity and specific heat capacity of aluminum alloys.

All are carbon steel.

and 2 times more than low-alloy steel. The thermal conductivity of aluminum is austenitic stainless steel.

more than a dozen times. During the torch welding process, a large amount of heat is rapidly conducted into the base metal, making it difficult to form a molten pool.

The use of small inner diameter gas pipe leads to too narrow protection range and excessive gas blowing force per unit area: for example, when a single copper pipe with an inner diameter of 4mm is used for protective gas protection, and the sample is placed vertically, due to the large fluidity of the liquid aluminum alloy, under the action of the protective air blowing force and its own gravity and other factors, the aluminum alloy in the molten pool is easy to flow down in the direction of gravity, resulting in the collapse of the weld after welding.

Can be welded, welding method:

1. Tungsten argon arc welding.

Tungsten argon arc welding is mainly used for aluminum alloy and is a good welding method, but tungsten argon arc welding equipment is more complex and not suitable for operation in open air conditions.

2. Resistance spot welding and seam welding.

This welding method can be used to weld aluminum alloy sheets with a thickness of less than 5mm. However, the equipment used in welding is more complex, the welding current is large, and the productivity is high, which is especially suitable for mass production of parts and components.

3. Pulse argon arc welding.

Pulsed argon arc welding can improve the stability of the welding process, and the parameters can be adjusted to control the arc power and weld forming. The weldment has small deformation and small heat-affected zone, which is especially suitable for thin plate, all-position welding and other occasions, as well as the welding of forged aluminum, duralumin, and ultra-duralumin with strong heat sensitivity.

4. Friction stir welding.

Friction stir welding is first and mainly used in the field of light metal structures such as aluminum alloy and magnesium alloy, and the biggest feature of this method is that the welding temperature is lower than the melting point of the material, which can avoid defects such as cracks and porosity caused by fusion welding.