Table 2: Temperature profiles and flow patterns of molten pools corresponding to temperature gradient of point A and point B and flow velocity of point B at different welding speeds and 4 kW laser power.

Welding speedsTop viewLongitudinal section viewTemperature gradient of point A and point BFlow velocity of point B

 mm/s252 K/mm32 mm/s

 mm/s 421 K/mm95 mm/s

 mm/s 552 K/mm111 mm/s