Welding technology has been widely applied in the oil industry and played an increasingly important role. For coiled tubing drilling, the weakest of the bottom hole assembly (BHA) that is dangerous section of the welds. In recent years, with the development of welding technology, coiled tubing manufacturer application of new technologies to improve the welding process, and improve the pipeline performance. Coiled tubing from the past "pipe on the tube end butt spiral submerged arc welded technology alternative. The immediate advantage of the spiral submerged arc welding is to weld the spiral-shaped distribution, greatly increase the axial strength of the tubing, coiled tubing reliability has also been significantly improved.
Submerged arc welding
Submerged arc welding principle and characteristics - submerged arc welding arc as a heat source. The submerged arc welding when the arc is burning in the granular layer to melt the solder under the coverage of the arc is not exposed, and thus called the submerged arc welding. Welding arc burning between the wire and the workpiece. Arc hot wire end and the arc near the base metal and flux melting. Molten metal formed in the weld pool, molten flux as slag. The arc to move forward, the arc force in the bath of liquid metal into the weld pool behind the. In the subsequent cooling process, this part of the liquid metal solidified into a weld. The slag is solidified into a slag shell covering on the weld surface. Slag in addition to the mechanical protection role of the weld pool and weld metal from the welding process, the molten metal, the metallurgical reaction, thus affecting the chemical composition of the weld metal. Submerged arc welding, the welder parts and wires were connected to the welding power poles. Wire by sliding contact with the contact tip and power connections. Welding circuit including the welding power source, connection cable, tip, wire arc, molten pool, work and other sectors. Continue to melt the wire end in the electric arc thermal effect, which wire should be sent in a continuous manner, in order to maintain the stability of the welding process is continuous. Wire feeding speed wire melting rate to the balance.
Submerged Arc Welding - Steel pipe manufacturing process
Welded Steel pipe manufacturing process: the spiral submerged arc welded pipe technology, straight seam in the process of resistance welding pipe, UOE pipe process. In which the spiral submerged arc welded pipe process the main production process: the demolition of the volume - flattening - the cutting head - head welding - cutting edge and bevel - helical shape - within the welding - Weld - weld UST inspection - flying shear - preliminary inspection of the naked eye - Manual check of UST - electromagnetic inspection - the size of the initial inspection - hydraulic test - flat head and chamfering - the naked eye, and the dimensions check - the end of a pipe of electromagnetic waves to check - User checks - weighing and measuring length - flag - shipment.
Spiral seam submerged arc welding in the oil industry and their profiles
Oil and gas pipeline transport: In order to adapt to the changes of the market for steel pipe demand, many companies have applied the technology to create products to meet the needs of the market.
Coiled Tubing: Coiled Tubing technology has become a hot topic in the world oil and gas industry applications. Coiled tubing annual consumption of nearly 5 million m. With the deepening of the reservoir drilling, deep and ultra deep well has become nowadays the main army, and this will inevitably bring to the increase in the number of coiled tubing in high pressure wells and ultra-deep wells operating. Provide high quality and safe and reliable coiled tubing, welding process as an important process in leading technical and operating and safety is particularly important. With the continuous development of the oil industry, coiled tubing drilling technology in foreign countries have made great progress, and has made successful application.
In addition, spiral submerged arc welded in the oil industry is also reflected in the drilling of casing (surface casing, intermediate casing, etc.)
