Four spot welding of PFW series large diameter straight pipe flange
Model specification
Pfw-800 / 1000 / 1200, applicable pipe diameter specifications are respectively Φ 89-830 / Φ 114-1020 / Φ 168-1220mm,
Customized Φ □ □ - □ □ □ mm
Equipment use
The four spot welding of the large diameter straight pipe flange is mainly used for fillet welding of straight pipe flat welding flange and butt welding of straight pipe high neck flange in coal mine, anti-corrosion, shipbuilding, UHV power tower and other industries
welding technology
Gas protection (GMAW)
□ GMAW + saw
□ submerged arc (SAW)
Other
Arrangement mode
One end fixed one end moving □ two ends fixed □ two ends moving
Welding quality:
The welding line is even and beautiful without appearance defects;
The qualification rate of grade I or II welds in radiographic or ultrasonic testing is more than 98%;
 meet the requirements of pressure test or impact, tensile, bending and other mechanical properties inspection.
The plug-in fillet welding shall meet the requirements of fillet height dimension and pressure test;
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