The auto-welding machine for H-type steel accepts the AC frequency converter to control speed with the merits of stable and reliable running and quick returning.It ues the auto-arc tracing & centering device to ensure the welding gun being auto and correct centering to the target workpiece .Meanwhile,it is equipped by the auto welding flux feed and recovry system,easy operating and high efficiency .And the column-beam welding machine can increase the height of web plate according to the need of uesrs. Model: LMH-400 SXBH20 Height of web plate 200-1200mm200-2000mm Width of web plate: 200-800mm 200-800mm Model of welder : Two sets of model MZ-1-1000 auto submerged-arc welders Form of welding: boat-type welding Welding speed: 0.15-1.0m/min Returning speed :3m/min 3m/min Gauge: 4000mm 2000mm Gas pressure: 0.2-8Mpa 0.2-0.8Mpa Overall Power: 10kw(excluding the welder)