Operating Specifications for Pipe-making machines

I. Preparations before Startup
Equipment inspection: Confirm the tension setting of the uncoiler (3-5 mpa); Check the gap of the forming roller (±0.1mm); Cooling water flow rate of high-frequency welding machine (≥15L/min)
Raw material confirmation: The width tolerance of the steel strip needs to comply with the JIS G 3302 standard; The deviation of the coil tower shape is less than 5mm;
Parameter preset: Welding frequency: 300-450kHz; Extrusion force: 1.2-1.8kN (adjusted according to the wall thickness) The compression rate of the sizing machine: 0.8%-1.2%
Ii. Standard Operating Procedures
Wearing stage:
Start the guiding device to lead the steel belt into the forming machine
The forming Angle is completed in 7 passes according to the "progressive bending method"
Welding stage:
The preheating temperature is controlled at 1200±50℃
Real-time monitoring of V-shaped opening angles (3°-7°)
Finishing process:
The sensitivity of the online eddy current detector is adjusted to φ0.5mm
The cutting length error of the flying saw is less than ±0.5mm
Iii. Key Points for Safe Operation
High-temperature resistant gloves must be worn when operating the welding machine area
The emergency stop button should be functionally tested no less than twice a month
The cleaning of the rolls should be carried out when the machine is completely shut down
Iv. Quality Control
The pass rate of the weld seam flattening test is ≥99.5%
The ellipticity is controlled within 1% of the diameter
The first item of each class must undergo metallographic examination