1.working with welding machine 2.welding range diameter:28cm~1.25m,28cm~1.7m,28cm~1.9m,28cm~2.3m,28cm~2.5m,28cm~3.8m welding machine,stone machine,welding machinery,welding rack,stone processing machine Model LQK-16LQK-18LQK-22LQK-25LQK-30 Welding range(diameter)mmφ280~φ1700φ280~φ1900φ280~φ2300φ280~φ2500φ280~φ3800Verticalitymm≤±0.03≤±0.03≤±0.03≤±0.03≤±0.03tip face bouncemm≤±0.03≤±0.03≤±0.03≤±0.03 ...