大家来讨论：定位焊和点焊有什么不同？ 查了科技大词典： 点焊 - dot welding，point weld，spot weld 定位焊 - tack welding，position welding asme ⅸ中对spot weld的定义：a weld made between or upon overlapping members in which coalescence may start and occur on the faying surfaces or may proceed from the outer surface of one member. the weld cross section (plan view) is approximately circular. 未看到tack welding或position welding的定义。 定位焊应该用于两个工件正式焊接前的定位连接，工件正式焊接时需要被打磨掉或熔化掉，是工艺性的临时焊缝。定位焊应该有一定的长度，不是一个“点”。 点焊连接是要满足设计的意图，其平面投影是一个近似的圆。比如，螺栓螺母之间点焊固定、两块搭接钢板之间的点焊连接等。 个人理解，供参考。 查看更多
反应器的hot box depth是指什么深度？ see attached picture. hot box = a box attached to a reactor where liquid and gaseous flows are intro ... i have not understood what it really means in practical reator, but i think you are right 查看更多
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