Within what time is it possible to train an operator? And which skill level should he/she have?
操作员培训需要多长时间？操作员应具有什么技能水平？
An operator can be trained within 2-3 days, then he/she can do operations and maintenance.   The operator should already have some basic welding experience.
操作员可在2-3天内完成培训，然后可进行操作和维护。 操作员应已经具有一些基本的焊接经验。