球壓試驗
ball-pressure test
試件放置於水平位置，以20N壓力壓5mm直徑鋼珠作用於試件表面。此測試應在加熱箱內進行，加熱箱溫度 75°C ± 2°C。鋼珠作用1小時後測量壓痕直徑。壓痕直徑大於2mm則試驗失敗。
The surface of the part to be tested is placed in the horizontal position and a steel ball of 5 mm diameter is pressed against the surface with a force of 20 N. The test is performed in a heating cabinet at a temperature of 75 ° C ± 2 ° C
The ball is withdrawn after 1 h and the diameter of the impression made by the ball is measured. An impression greater than 2 mm in diameter constitutes a failure.
