Classification and use of welded steel pipes

Welding technology for directly welded steel pipes:

the use of small-scale models can avoid stress corrosion, thermal cracks and deformation, and the welding current is 20% lower than that of high carbon steel. In order to ensure that the electric isolation is ignited, a DC reverse connection is used. The short arc welding strategy should slowly stop loneliness, add electrical craters, and finally weld and contact the surface of the material. In the multi-layer high-rise electric welding, the temperature of the virtual beam should be controlled, and forced water cooling can be used after welding.

Arc welding:

used for arc welding of lsaw, good maintenance, good welding high temperature performance, good physical properties, aluminum alloy parts are not easy to burn, high connection index, good welding formability, no dross shell, smooth surface. At present, the manual tungsten argon arc welding market is mainly used for the welding of 0.5~3mm stainless steel plates by argon arc welding machines. The composition of the electrode is generally the same as the welding part.

Gas welding:

Due to the convenience of gas welding and strong coordination ability, it can be used for welding various indoor space parts. For some directly welded steel pipe components, such as thin-plate structures, thin-walled pipes, etc., sometimes gas welding can also be used in the case of non-corrosion resistance. In order to avoid over temperature, the ultrasonic mold is generally smaller than the high carbon steel of the same thickness welded by electric welding.

Submerged arc welding:

submerged arc welding is suitable for medium and horizontal thin, left and right straight seam welded steel pipe plates. Submerged arc welding has a high output rate, and electric welding is cost-effective, but it can easily lead to the segregation of aluminum alloy elements and residues. ssaw, lsaw, erw steel pipes can be welded by submerged arc welding.

Hand Soldering:

Hand soldering is a very common and convenient soldering process. The arc length is adjusted by each individual, depending on the size of the gap between the metal electrode and the steel piece. Furthermore, when used as an arc particle carrier, the metal electrode is the raw material for welding. The welding process of this straight seam welded steel pipe is relatively simple, and it can basically be used for electric welding of all raw materials.

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