Submerged arc welding pipe welding, welding wire and steel pipes were connected to a power of two, the welding power source is AC or DC to DC, steel pipe connected to the negative terminal of the power supply, wire connected to the positive power supply wire through the little conductivemouth by the wire feeder to the workpiece to a certain speed transmission, arc burning between the wire and the workpiece. Arc stable burning is determined by wire to give speed and wire melting rate, when the same speed on the stability of arc burning. The arc voltage sent to the control wire speed often uniform to give and to give two kinds of ways. And static characteristic curve of the external characteristic curve and arc welding power source. Welding pipe welding with power density (welding current A / wire cross-sectional area mm2) a large, generally more than 50 A / mm2 characteristics, so the wire isokinetic gave to maintain the arc stable combustion is possible, the external characteristic curves can be a steep drop or constant current external characteristic curves can be stable arc burning.

Submerged arc welding pipe welding, flux from the front of the wire into the welding zone, always covered with a welding arc zone. Cooling of the weld and cooling the slag shell each other due to different heat shrinkable coefficient of slag shell will automatically fall off, the excess flux and slag shell automatic separation and recovery. Submerged Arc Welding Pipe, the wire down the conveyor, steel mechanical movement, also known as automatic submerged arc welding. Wire drive system and the flux is installed on the mobile device in hand-welding, become semi-automatic submerged arc welding.

Spiral pipe production process is simple, high efficiency, low cost and rapid development. The strength of the spiral welded pipe is generally higher than the LSAW steel pipe, can narrow the billet production of large diameter pipe, you can also use the same width of the billet production of different diameters of pipe. However, compared with the same length of straight seam pipe, the weld length increased by 30-100%, and lower production rate. Therefore, the smaller diameter pipe mostly straight seam welded large diameter pipe most of the spiral.

Spiral pipe is mainly used in the pipe for bridges, docks, roads, building structures,

The transport of liquids: water supply, drainage, sewage treatment works, transmission and mud, marine conveyance. Gas transportation: gas, steam, liquefied petroleum gas.

Structural: the marine piling pipe in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction, China’s development of 20 one of the key products.