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4. Welding process
4.1 Parts preparation
Strictly from a geometric point of view, all revolution joints can be made by friction.
When cross-sections are not equal, it may be necessary to prepare the larger part to achieve symmetry and better thermal distribution for balanced creep. Figure 5 shows some of the basic principles commonly used.
When the metals are dissimilar, this results in an asymmetrical configuration of the beads (figure 6 ).
In practice, the most important conditions of use are :
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Welding process