For the strip progressively coiled tube and straight seam welded steel pipe, depending on the welding process when used in its production can be divided into a continuous furnace welding (forge welding) pipe, tube and arc resistance welding Li key welding pipe three.
1. The continuous furnace welding (forge welding) riveting
Continuous furnace brazed (forge welding) of the pipe is in the heating furnace for heating the steel strip, and then forming edge Pat mechanical pressing method so that the welding together to form a straight seam having a pipe. Its features are: high efficiency, low production costs; but the weld quality is poor, poor mechanical properties. Currently, it is mainly applied to the design temperature of 0-100 ℃, the design pressure of not more than 0.6 MPa water and compressed air systems.
2. The resistance of bare steel
Pipes are produced by resistance welding riveting resistance or induction welding method, a straight pipe with a seam, which is characterized by high efficiency, high degree of automation, deformation and residual stress after welding small; but its high investment in equipment, the quality of welded joints requirements are relatively high; and because the joint is inevitable impurities, so fitting plastic and low impact toughness. At present, it is mainly applied to the design ju not higher than 200 ℃ of water, gas, air, steam and other heating and oil and gas industry can be fluid and non-tender fluid, low-pressure pipe.
3. The arc tube bad record
Arc welding pipe is produced by electric arc welding steel pipes. Its characteristics are achieved complete metallurgical bond joints, the mechanical properties of the joint can fully meet or achieve the mechanical properties of the base material. After saying after appropriate heat treatment, arc welding straight seam steel pipe seamless steel pipe can be achieved using conditions will replace it with conditions. At present, it is mainly applied to the design not higher than 200 ℃ of water, gas, air, heating and other design pressure less than 5.0 MPa steam pipes.
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