To increase top forging pressure during applying welding.
增加施焊时的顶锻压力。
Spot welding requires both an electric current and a forging pressure to produce the weld.
点焊需要电流及锻压来产生焊缝。
The hydraulic press produces the general pressure is big, commonly used in forging and ramming.
水压机产生的总压力较大，常用于锻造和冲压。
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