There are exceptions to this. In the 2XXX family, , , and are readily arc weldable. The rest are not. In the 7XXX family, , , and are arc weldable. Please note that when I say weldable I am talking about fusion welding processes. But those are beyond the scope of this column. So, back to your question. What should you do? I know that this hurts. Email Frank Armao.
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Not yet registered? Sign up. Our Sites. Categories Additive Manufacturing. Aluminum Welding. Assembly and Joining. The resulting welded joints have a tensile strength of up to megapascals — by contrast, the commonly-used aluminum alloy has a weld strength of megapascals. What's more, it is believed that post-welding heat treatments could boost the strength of the welds up to megapascals, which is on par with the weld strength of steel.
Although the alloy is already used in items such as airplane wings and fuselages, sheets of it typically have to be riveted together. The scientists now hope that the ability to weld it will increase its applications. Li and his team are in fact already working with a bicycle manufacturer, which is interested in utilizing the technology to make frames. A paper on the research was recently published in the journal Nature Communications.
Source: UCLA. LOG IN. Menu HOME. Search Query Submit Search. By Ben Coxworth. Facebook Twitter Flipboard LinkedIn. Xiaochun Li, with a prototype welded AA bicycle frame.
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A — The reason you are having difficulty finding information on welding and is that both of these materials belong to a small group of aluminum alloys that are generally considered as being unweldable by the arc welding process.
These materials are often found on aircraft, sporting equipment and other types of high-performance, safety-critical equipment and are not usually arc welded on the original component. Probably, the two most commonly found aluminum alloys within this category are , which is an aluminum, copper, magnesium alloy, and , which is an aluminum, zinc, copper, magnesium alloy.
Both of these materials can become susceptible to stress corrosion cracking after welding. This phenomenon is particularly dangerous because it is not detectable immediately after welding, and usually develops at a later date when the component is in service. The completed weld joint can appear to be of excellent quality immediately after welding.
However, changes which occur within the base material adjacent to the weld during the welding process, can produce a metallurgical condition within these materials which can result in intergranular micro cracking, which may be susceptible to propagation and eventual failure of the welded component. The probability of failure can be high, and the time to failure is generally unpredictable and dependent on variables such as tensile stress applied to the joint, environmental conditions, and the period of time which the component is subjected to these variables.
It is strongly recommended that great care be taken when considering the repair of components made from these materials. It must be stressed that if there is any possibility of a weld failure becoming the cause of damage or injury to person or property, do not perform repair work by arc welding on these alloys and then return them to service.
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