... coutinously working 3.marking speed 7m/s laser marking and engraving machineHW YAG-ZJ50W-II adopts imported high ... operation. This machine is equipped with credible outer water-cooling system, which can supply dependable guarantee when long time working. ... like iron, copper, aluminium, magnesium, zinc, etcâ?¦), rare metal and alloy(gold, silver, titanium), metal oxides, ABS materials (enclosures ...