对冲压圆点连接的机理和圆点处的金相组织进行了分析。
An analysis was made on the connection mechanism of the pressing circle and on the metallographic structure at the circle area.
这个错觉是在1870年首次发现的，其特点是：“诡异的”浅灰色圆点间歇性的出现，似乎连接着白色的表面和黑色的背景。
This illusion first discovered in 1870 is characterized by the "ghostlike" intermittent appearance of lightly colored gray dots that seem to connect the white surfaces and the black background.
由于被连接的板料在冲压连接圆点处受挤压，所以在材料的连接处产生压应力，提高了连接的抗疲劳强度。
Since the plates were squashed at the pressing circle area and pressing stress was brought to the connecting point of the material, the anti_fatigue stren…
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