Tack weld on aluminum plate 6mm thickness

Tack weld on  aluminum  plate 6mm thickness 

 Aluminum is a lightweight, soft, low strength metal that can be easily molded, forged, machined, and welded.

Aluminum is easily joined by welding, brazing, and soldering.

In many instances, aluminum is combined with traditional equipment and techniques used with other metals. However, sometimes special tools or techniques may be required.

Selection of the alloy, joint configuration, strength requirement, appearance, and cost are the deciding factors of the process. Each process has some advantages and limitations.

color

Aluminum is light brown to silver in color, very bright when polished, and dull when oxidized.

Features

The aluminum spark test does not give any spark and does not appear red before melting. A heavy film of white oxide is instantly formed on the molten surface.

Aluminum is light in weight and the subzero maintains good ductility at temperatures. It has a high resistance to corrosion, good electrical and thermal conductivity, and high reflectivity to both heat and light.

Pure aluminum melts at 1221ºF (660 melt), while aluminum alloys have an estimated melting range of 900 to 1220 900F (483 to 661tingC). There is no color change in aluminum when heated in the welding or brazing range.

The combination of light and strength makes aluminum the second most popular steel metal to be welded.

Welding Properties and Alloys

Aluminum and aluminum alloys can be satisfactorily welded by carbon and other arc welding processes. Pure aluminum can be an alloy with many other metals to produce a wide range of physical and mechanical properties. How aluminum reinforcing elements are used as the basis for classifying alloys into two categories: non-heat-curable and heat curable. Alloys are fabricated in the form of sheet and plate, tubing, extruded and rolled shapes, and forgings have similar joining characteristics regardless of form. Aluminum alloys are also produced as castings in the form of sand, permanent molds, or die castings. Mainly the same welding, brazing, or soldering practice is used on both cast and wrought metal.

Aluminum alloy Number.

1. 1*** series. These are aluminum of 100% percent or higher purity used.
2. 2*** series. Copper is the  alloy in this group, 
3. 3*** series. Manganese is the major alloy element in this group, which is non-heat-treatable. The manganese content is limited to about 1.6 percent. These alloys have moderate strength and are easily worked.
4. 4*** series. Silicon is the major alloy element in this group. It can be added in sufficient quantities to substantially reduce the melting point and is used for brazing alloys and weld electrodes. Most of the alloy in this group is non-heat-treatable.
5. 5***series. Magnesium is the major alloying element of this group, which are alloys of medium strength. They possess good weld characteristics and good corrosion resistance, but the amount of cold working should be limited.
6. 6*** series. Alloys in this group contain silicon and magnesium, which make them heat treatable. These alloys possess medium strength and good corrosion resistance.
7. 7***series. Zinc is the major alloying element in this group. Magnesium is also included in most of these alloys. Together, they form a heat-treatable alloy of very high strength, which is used for aircraft frames.