真空变幅杆
一种与真空泵相连的变幅杆（通常无槽），用于在焊接前将小零件吸附在变幅杆工作面上。真空管通常连接在波节处。
Vacuum horn
A horn (usually unslotted) that is connected to a vacuum pump as a means of holding a small part against the horn face prior to welding. The vacuum tube is often connected at a node.
