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Double-sided submerged arc spiral steel pipe is that arc method is welding under flux layer, and formed is that the heat generated by the burning of the arc between the wire and flux in the flux layer and melting of the wire solder and base metal.As for the following reasons it is widely used in the production of large diameter steel pipe

Pipeline is put oil,gas,water out of the ground, transported to the oil and gas industry enterprises through the line pipe including seamless pipe and welded steel pipe.

UV paint is the abbreviation of Ultraviolet Curing Paint, UV-curable paint, also called photoinitiated coating, light-curable coatings. Named to the film-forming material with PU, PE, NC paint different the UV lacquer paint curing named.

Pipeline transport as rail, road, maritime, civil aviation and five long-distance pipeline transport industry, one of the national economy plays an important role. Its transmission medium to common petroleum, natural gas, in addition to industrial gases such as oxygen, CO2, ethylene, ammonia, pulp, coal slurry and other media. Currently pipeline network must be set up by welding, in order to ensure the quality of welding pipe joints, only local conditions to select the appropriate welding process and appropriate equipment to meet project quality requirements, and also to improve engineering efficiency.

Pipeline in logistics transportaion bears almost all gases and most fluid transport of goods. Different transport object, which can be divided into the pipeline transportation of natural gas pipelines and solid slurry pipeline transportation of three.

Industrial pipe is a broad category of fluid and solid transport hardware used in many applications and industries. Usually cylindrical, pipe and rigid tube is used in process, energy, construction, and many civil infrastructure applications. Industrial pipes and rigid tubes are manufactured from a wide variety of materials for the transport of an equally wide variety of solids and fluids. Industrial pipe construction and material specifications are application-dependent; user consultation with pipe suppliers is typical for optimization of pipe selection.

In accordance with the different processes of production, seamless steel pipe is parallel to the longitudinal weld steel pipe steel pipe, usually divided into metric welded steel pipe, welding thin-walled tube, transformer cooling tubing.

When steel pipe yield is to a certain extent, due to the internal grain rearrange its ability to resist deformation increased, although at this time deformation developed rapidly, but it can only be increased as the stress increased, until the stress reaches the maximum value.

SMAW (shielded metal arc welding) is the most widely used in industrial production welding method, it is the use of an arc discharge (commonly known as the arc burning) heat generated melts the electrode and the workpiece with each other and form a weld after condensation, thereby obtaining a solid welded joints process. SMAW electrodes are manipulated by hand welding work can be welding, vertical welding, horizontal and overhead welding and other welding position welding.

The main energy parameters that determine the weld size are welding current, voltage and welding speed.

Preheating before welding and heat treatment after welding have great influence on welding quality. Preheating before welding is required for important components.

The main disadvantage of CO2 gas shielded welding is welding spatter, which mainly adopts the following measures: