By Koichi Masubuchi
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Extra info for Analysis of Welded Structures. Residual Stresses, Distortion, and Their Consequences
Consequently, when titanium is welded, it must be completely protected from external elements, including not only the molten weld puddle, but all metal that is hot. As a general rule, a temperature above 1200°F (649°C) is regarded "hot" for the periods of time at temperature associated with welding. Normal fluxes provide inadequante protection for titanium. In fact, they may actually contribute to a loss of weld ductility by alloying with the metal. S. R. for joining titanium. A flux for titanium must be relatively non-reactive and produce no harmful compounds in the metal.
Commercially pure titanium. A weld in titanium that is commercially pure is essentially a casting. The grain size is very large and the structure consists of beta dendrites. (124) Titanium alloys. The structure of titanium alloy welds varies according to the alloy content. The weld is still a large grained casting which also has some transformation structures. A segregation effect during solidification occurs due to differences in composition between liquids and solids of the alloy. (119) "Two important factors in welding titanium and titanium alloys are: 1.
12 describes the major alloying elements in the wrought aluminum alloys/ 102,114) The four-digit system of classifying aluminum alloys is used by the Aluminum Association : 1st digit = major constituents 2nd digit = the modification 3rd and 4th digits = alloy In the 2xxx-8xxx alloy classification group, the last two digits have no special significance, but are used to identify different aluminum alloys in the group. lxxx series. This series is demonstrated by alloy 1100, which is 99% pure aluminum, non-heat treatable, soft and ductile, highly corrosion resistant, formable and weldable.
Analysis of Welded Structures. Residual Stresses, Distortion, and Their Consequences by Koichi Masubuchi