By Koichi Masubuchi
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Extra info for Analysis of Welded Structures. Residual Stresses, Distortion, and Their Consequences
4. A series of metallurgical quality corridor zones, which are related to the melting and processing practices used to produce the steels, become evident. The lowest corridor zone involves relatively low-alloy commercial Q&T steels produced by conventional low-cost melting practices. 5 kg/mm 2 or 896 to 1034 MN/m 2 ). Optimum levels of alloy content, coupled with improved melting and processing practices, elevate the corridors to higher levels. 5 ratio is shifted accordingly to higher levels of yield strengths.
6xxx series. A heat-treatable material, this alloy has sheets, plate and extrusions two-thirds to three-quarters less in strength than the 2xxx series. However, it is easily available, weldable and cheap, which makes it practical for structures with low dynamic loading factors. Alloys 6063 and 6061 are two of the most versatile of aluminum alloys of intermediate strength. They have outstanding corrosion resistance. 7xxx series. This group contains the highest strength. It is used in aircraft, although it involves some forming difficulties.
New processes allow high-speed welding with manual or automatic equipment which is standardized and readily available. Many times the power source for steel welding can be applied to aluminum welding. Two welding processes are most used with aluminum—gas tungsten arc welding (GTA) and gas metal arc welding (GMA). GTA. The process involves no flux, but is slow and not commonly used for joining heavy plates. 04 in. (1 mm). 25 in. 4 mm). GMA. The process is faster and cheaper and requires less manual dexterity than GTA.
Analysis of Welded Structures. Residual Stresses, Distortion, and Their Consequences by Koichi Masubuchi