The frames are welded manually and the weld is made in four steps. In the first step (picture 1) the tubes are joined by spot welding. In the second step (picture 2) the welder makes the weld around the tube. The next step involves melting the weld metal (picture3 ). When the welding is finished the weld is ground manually, (picture 4) surface tension of the weld is then removed and a very compact design is reached. When the frames are welded in Duratec, there is no weld spatter typical of robot welding. The tubes are joined by a full penetration weld which creates an optically elegant joint of high strength.
Technical information for the curious:
TIG welding method. The acronym TIG stands for Tungsten Inert Gas. It uses a tungsten electrode in a shielding atmosphere of inert gas.
Advantage of the TIG method: The biggest advantage of the TIG method is a great control over weld pool. TIG is a precise issue. Contrary to other arc welding methods, no constant input of additional material into the pool is needed and thus the welder can better influence the weld pool as well as the properties of the weld joint. The welder adds the additional material when necessary. Therefore, no thermal influence of basic material in such a wide area around the weld occurs and it is vice versa possible to reach a big depth of the weld. It has a positive effect on thermal deformations of the weld. Moreover, the heat input into the weld can be controlled effectively. As for another positive properties we can mention a convenient shaping of the weld spatter on the surface as well as in the core and good operating properties of TIG in positions. What is interesting is a possibility to weld very thin materials. It is also possible to use very low currents (from the units of amperes) which results in the possibility to weld very thin materials. In extreme cases and with the use of special power supplies and welding torches it is possible to weld even foils at currents lower than1 A.