这句话什么意思? 关于焊接操作的要求? for wall thickness greater than 10mm and in the down hand position, the filling and capping can be performed by the spray arc metal transfer mode, with either solid or fcaw, welding shall be carried out in a protected environment(building, tent, etc.) 对于壁厚大于10mm以及采用向下方向的焊接,填充层和盖面层能使用熔滴过渡方式,用实心焊丝或药芯焊丝气保焊,施焊环境必须得到保护(比如在厂房里、帐篷里等)。查看更多