... machine welding machine welding machinearc welding machinetube welding mahineParamter PerformanceModel:LHJ4020 LHJ(light duty type)Lifting stroke:1600m StationaryRetracting stroke: 4200m ... decrease between roller and railMachine demension:4.8m*1m*3m. LHJ4020 Tube welding Machine,arc welding machine,welding equipment