Weld time increasing

An increase in welding time increases the amount of time axial pressure and rotational motion are maintained and results in an almost linear increase in weld penetration.f l Stopping rotation at the beginning of phase V with an abrupt stop rather than continuous braking results in a higher weld quality in some materials. 

The simulation calculations show additionally, that the maximum temperature does not occur in the joining plane but in the absorbing material (Fig. 8). The melt layer thickness in the transparent part is thus generally thinner than in the absorbing part, and the squeeze flow starts in the absorbing part, and only later spreads to the tfansparent material. The laser absorption in the ttansparent part causes a gradual shift in the location of the maximum temperature towards the ttansparent adherend as the welding time increases. 

For a longer test duration, axial pressure and rotational movement are maintained for a longer period of time. This allows more melting and, thus, greater weld penetration for increased test duration. This increase in weld penetration with increasing test duration appears to be quite linear in most cases. The final weld penetration increases with increasing rotational speed and increasing axial pressure. 

Note Field welding is something that is typicalfy avoided due to time, cost and problems associated with field welding galvanized steel (that is, prep for welding and increased corrosion potential). 

The compaction time (welding time) was increased in Is steps from 2s to 5s for each setting. This experimental... 

Tubular structures are easier to coat than those produced from profiled metal, e.g. a flare stack constructed of welded tubes can increase the life of a brush- or roller-applied paint system by as much as four times over the same process applied to a similar structure built of welded angled steel. 

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