Process: Selection of copper nozzle welding wire gas and confirmation of focus一. 铜嘴的使用I. The use of copper nozzles铜嘴的分类主要区分:是否送丝,焊丝的大小,焊接角度,如上图所示,如内角送丝焊接1.0的焊丝则使用AS-12的铜嘴The classification of copper nozzles is mainly distinguished: whether to feed wire, the size of the welding wire, the welding angl