welding machine machine welding machine welding machinearc welding machinetube welding mahineParamter PerformanceModel:LHJ4020 LHJ(light ... anti-falling device, of ratchet structure,safe and reliable.Welding machine:Mz1000Speed controller: frequency conversion Boom end has cross-slides,whic ... and railMachine demension:4.8m*1m*3m. LHJ4020 Tube welding Machine,arc welding machine,welding equipment