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avant de commencer à produire des arcs électriques
Explanation: [Hoods shall be on your hard hat and in the correct position (with safety glasses on)]
before you strike an [electrical] arc
basically it means that before you start welding using an electrical arc (as opposed to welding using a flame/torch) you have to be fully/properly protected;
Daryo United Kingdom Local time: 23:55 Specializes in field Native speaker of: Serbian, French PRO pts in category: 69