溶接凝固機構とその組織の特性(第6報)

高純度アルミニウムの溶接部における凝固組織の特性

抄録

The growth direction of cellular subgrains and the preferred orientation in columnar zone in TIG-arc weld metal have been investigated for aluminum 1 mm thick sheets of 99.96% purity. Conclusions obtained are as follows:
(1) The growth direction of cellular subgrains in the weld metal of such a high purity aluminum agrees with the direction of the maximum temperature gradient at the solid-liquid interface, and is independent of ‹100› direction. Therefore, when the direction of the maximum temperature gradient gradually changes as growth proceeds, the growth direction follows its change.
(2) A competitive growth among the columnar crystals proceeds near the weld center. As a result, the columnar zone near the weld.center has [100] fiber texture.