Coil

Coil tube as its name implies is a spiral tube system. Such as the coil - shaped aluminum plastic pipe, such as back - type installation of floor heating pipe and so on.

Rust removal method of pipe bending:

1. Pipe bending cleaning: the surface should be cleaned with solvent and emulsion to remove grease, oil, dust, smoothing agent and similar organics;

2. Pickling of the bend: the bending corrosion can be treated by chemical pickling, which can remove the oxide, rust and old coating.

3. Spray rust removal: the high-power motor drives the high-speed torsion of the jet blade, so that the steel sand, iron wire segment, minerals and other abrasive materials can be sprayed on the appearance of the curved pipe under the centrifugal effect.

Notes for use of medium frequency bend:

1. In order to prevent the corrosion between the eyepieces caused by heating, the welding current should not be too large, the arc should not be too long, the interlayer should be fast cold, and the narrow welding path should be preferred;

2. When welding the medium frequency bending pipe, it will be subjected to repeated heating to precipitate carbide, which will reduce the corrosion resistance and mechanical properties;

3, using the same type of chromium stainless steel electrode, should be above 200 ℃ preheat and around 800 ℃ tempering treatment after welding, if cannot undertake the weldment heat treatment, should choose chromium nickel stainless steel electrode;

4. If the ac welding of medium frequency super-large bending pipe is shallow and easy to turn red, dc power should be used as much as possible;

5. Medium frequency super-large bending pipe is more hardening and prone to cracks after welding. If using the same type of intermediate frequency bend welding, preheating and more than 300 ℃ at 700 ℃ or so slow cooling after welding.