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Aluminum Welding
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Here are some more information for Aluminum Welding:
What kind of Structures are made from aluminum? The first thing that comes to mind is Ships. Aluminum hull ships are becoming increasingly in demand for military applications as well as for commercial transportation.
Why? Aluminum is lighter and that saves fuel and increases speed.
AWS D1.2 is the Structural welding code for aluminum. It not only provides weld joint design and limitations but also specifies how welders are to be certified for welding aluminum.
The main processes used to weld aluminum structures are Gas Tungsten Arc (GTAW) , Gas Metal Arc (GMAW), and variable polarity plasma arc (VPPAW). Gas metal arc is the mainstay welding process for shipbuilding but friction stir is being researched as a possibility in the future.
Along with the need to certify the welder, It is especially important for the procedure to be qualified for aluminum structures. Aluminum loses a great deal of its strength when welded and the procedure used to weld it can greatly affect the outcome. Usually, its a struggle to use enough heat input to limit porosity, while at the same time, use low enough heat input not to alter the strength and other physical properties of the alloy.
Carbon steel will harden if it is heated to a high enough temperature and then cooled quickly. That's how we make knife blades and such.
But aluminum is just the opposite. When it is heated to an elevated temperature as happens during welding, it immediately begins to lose its hardness, whether its a heat treatable alloy like 6061 t6, or 3003 h14. Either way it loses hardness and strength if it gets hot enough. Quick quenching after heating only ensures softness.
AWS D1.2 requires the use of qualified welding procedures to ensure minimal tensile properties are met in the weld metal as well as the heat affected zone.
Jody Collier's articles on topics like Welding Certification are full of Down and Dirty welding tips. For TIG, MIG, and STICK welding tips along with a crapload of other welding information, visit http://www.weldingtipsandtricks.com/.
What You Should Know About Aluminum Welding
Aluminum extrusion and aluminum welding go hand in hand. Extrusion allows for a variance in the thickness of the wall in whatever aluminum object that was created by the extrusion process. Because the wall can have a varying thickness throughout the object, that object can have something called a vee groove.
What is a vee groove? A vee groove is a V-shaped formation in a piece of metal. The vee groove facilitates performance of a welding process. The welding process is used to create a bond between two different metals.
If a vee groove exists in an aluminum part, that aluminum part can be welded to a different metal part. Aluminum welding is used to melt one metal part, a part that should be joined to another metal part. The heat from the welding device creates a small pool of liquid. That liquid forms a puddle in the vee groove.
The hot liquid is used to bond two different metals. The hot liquid in the vee groove coalesces around a section of each of the two different metal parts. Once the molten material has hardened, the metal objects have been fused together.
Coalescence permits the joining of aluminum and a second metal, but it is not the only scientific property that can aid formation of a metal to metal bond. Not every fusion of aluminum and a second metal has resulted from aluminum welding. Sometimes that fusion is produced by a process called brazing.
Brazing relies on the properties of capillary action. As in aluminum welding, in brazing a section of metal must be heated to the point where it enters a liquid state. That molten metal is then distributed on the close-fitting metal parts. After the liquid metal hardens, then the metal parts are firmly fused together.
Both aluminum welding and brazing can call for exposure of metals to a good deal of heat. Sometimes a metal worker does not want to expose a piece of metal to very high temperatures. If that piece of metal should be joined to another metal, then what process can the metal worker use?
When a metal worker faces the above-mentioned problem, then he or she needs to use a process called soldering. Soldering takes advantage of the low melting point of one metal, a metal different from the two metals that need to be joined together. Liquid from a metallic substance with a low melting point is used to create an adherence between two different metal parts.
Aluminum alloys do not always need to be joined by welding, brazing or soldering. Sometimes aluminum alloys have been held together by adhesive bonding. Sometimes mechanical fasteners clasp onto two connected, aluminum alloys. Sometimes bolts, nuts or rivets are used to join together two different aluminum alloys.
All of the above methods create a strong metal to metal bond. All of the above methods benefit from the tensile strength of aluminum. All of the above methods use to advantage a characteristic of the extrusion process.
Both aluminum welding and the other metal joining methods put demands on an extruded metal object. Still, an object created by the extrusion process can be made thickest at the points where it receives the most pressure.
About the Author
Alfiniti provides
aluminum extrusion
and
aluminum welding
. Visit
http://www.alfiniti.com
the wind damaged my aluminum gazebo frame..some parts need welding back together..will a soldering gun work?
Cat lute is on the right track. Aluminum (other than light weight wiring) cannot be soldered. Welding aluminum is an art and your material is probably not thick enough to sustain such a weld. Explore mechanical repair methods - nuts bolts, screws (aluminum is easy to screw into), brackets etc. You can even use sections of lumber e.g. 2 x 4 piece(s) to rejoin aluminum sections then paint the wood to match.
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