Welding and anticorrosive technology of spiral welded pipe

The production process of spiral welded pipe is relatively simple, not only the production efficiency is relatively high, the production cost is low, so spiral welded pipe has been grown in many industries, so in the application of Spiral tube, how to carry out welding operation, Xiaobian told the friends, in the application of Spiral tube before deoxidizer deoxidizer.

Welding procedure of spiral welded pipe

In this way, the amount and size of impurities will be reduced during the operation of spiral welded pipe. Remember that Spiral tube is welded directly into steel pipe by high frequency welding. The shape of the welded pipe can be round or square. The high frequency welding of Spiral tube is a phenomenon that the edge of weld is heated to melt by the eddy current thermal effect of AC charge in the conductor based on the principle of electromagnetic induction.

In the processing of Spiral tube, the stability of forming is closely related to the welding quality, only improve the forming quality can fully ensure the welding quality, Spiral tube in the welding process of the size and change of the forming gap, in order to ensure the good appearance of spiral welded pipe weld and enough penetration, the regulation of steel plate joint gap distribution, in addition according to the different weld gap, Select different welding specifications.

Helical welding pipe anticorrosion steps

The anticorrosion method of spiral welded pipe starts from the control of a certain process. However, such protection law does not exist when metal materials with negative potential of Spiral tube are connected with spiral steel pipe. Therefore, anticorrosive coating and sacrificial anode should be adopted in urban main gas transmission pipe. For part of the low pressure non - main pipeline, usually directly choose anticorrosive coating method.

At present, the commonly used outer anticorrosive layer of buried gas pipeline has three PE composite structures. Epoxy resin powder (FBE), coal tar enamel. Epoxy coal asphalt and PE belt and other five categories. Neither waste nor increase maintenance costs.

But it should be noted that when the resistance of the soil is too large, it is not suitable for sacrificial anode protection. Different anticorrosion methods have different anticorrosion quality and cost, which should be determined according to the pressure of helix welded pipe.

I hope that through the above content, we can have a further understanding and understanding of the application of spiral welded pipe in the drainage pipe, click consultation