3.金属粉尘及金属氧化物在氩弧焊和等离子焊接过程中,不仅产生高浓度的臭氧和氮氧化物,还能产生某些金属氧化物及粉尘。在等离子喷焊、喷涂等工艺过程中,有些金属氧化物及金属粉尘的浓度还很高。而且这些有害物质随焊接材料 3. Metal dust and metal oxides in the welding and plasma welding process, not only produce high concentrations of ozone and nitrogen oxides, but also produce some metal oxides and dust. In the plasma spray, spray and other processes, some metal oxide and metal dust concentrations are still high. And these hazardous materials with the welding material