Submerged arc welding principles of spiral welded pipe

Submerged arc welding steel pipes, wires and steel poles are connected to the power supply, the welding power supply can be AC ​​can also be DC, province DC, the pipe connected to the power supply negative wire connected to the positive power supply wire through the tip charged by the wire feeder to - set the pace toward the workpiece conveyor, arcing between the wire and the workpiece burning. Stability of the arc is burning out the wire feed speed and wire melting rate to decide, when the speed is consistent arc to stabilize combustion. Control wire feed speed, and so often give uniform arc voltage Tuen give 2 ways, and with the welding power characteristic curve and the outer arc static characteristic curve related. Because the tube is welded with a welding current density (welding current A / wire cut solid plot mm ') is large, generally more than 50 A / mm' characteristics, so the use of arc welding to maintain isokinetic give stable combustion is possible, external power supply characteristic curve can be steep drop or constant current characteristic curves can be obtained outside the arc stable combustion.

Submerged arc welding pipe welding, flux wire inside the front into the welding area, and always covered with a welding arc weld zone * cooled and cooled crust mutual shrink factor because do not ask, crusts will automatically fall off, the excess flux party talks were automatically separated and recovered. Spiral submerged arc welded pipe welding, the wire down the conveyor, steel mechanical movement, it is also known as automatic submerged arc welding. The award is the wire drive system and flux welding on mobile devices, known as semi-automatic submerged arc welding.