300 kg welding positioner through the through hole, a 300 kg pipe welding positioner 300 kg welding positioner through the through hole, a 300 kg pipe welding positioner welding up to promotional 50/100 kg Jinan pipe welding positioner, through hole positioner, reliable quality and after-sale protection. 30 kg pipe welding positioner, welding positioner control center bore: 25mm 50 公斤 pipe welding positioner, welding positioner control center bore: 45mm 100 公斤 pipe welding positioner, welding positioner control center through hole: 45mm 300 male pipe welding positioner, welding positioner control center bore: 90mm through-hole positioner advantages: long welding pipe fittings and flanges butt, as long as the diameter of the tubes pass through holes from the past, the length of the tube it will not affect the welding. Variable-bit machine with a central through-hole, long workpieces can be directly through the through holes, welding, easy to protect the internal gas into the pipeline, improve the welding efficiency.