Hot dip galvanized pipe surface is plated layer or electric galvanized welded steel pipe. Galvanized steel pipe corrosion resistance can increase, prolong service life. The purpose of the product is very wide, in addition to a general low pressure fluid such as water, oil line pipe, also used in the oil industry, such as Marine oil field cold drawn tubes oil well pipe, oil pipe, chemical coking equipment of oil heater, the condensing, exchange of coal distillation wash oil cooler for tube, and trestle pile, mining tunnel supporting frame tube, etc.
Galvanized pipe common cleaning methods are as follows:
1, the first to use solvent to clean steel, the surface of the organic matter removal;
2, then use the tools (wire brush) derusting, remove scale, rust, loose or tilted welding slag, etc.;
3, the use of acid pickling.
Hot galvanized pipe is divided into hot and cold, the plating coating is not easy to rust, cold plating is easy to rust.
Advantages: hot dip galvanized tube galvanized layer thickness, coating uniformity, strong adhesion, long service life, etc. Electric galvanized the cost is low, the surface is not very smooth, its poor corrosion resistance.
Disadvantages: cold galvanized beam impact tubes layer is electrodeposited coating, zinc layer and steel substrate layer separately. Zinc layer is thinner, the zinc layer attached to the steel substrate simple, easy to fall off, so its corrosion resistance is poor. In the new residence, banning the use of cold plating products as feed pipe.
Hot dip galvanized pipe widely used in construction, machinery, coal, chemical industry, railway vehicles, automotive industry, roads, Bridges, containers, sports facilities, agricultural machinery, petroleum machinery manufacturing industry.
Product surface with hot dip plating layer or electric galvanized welded steel pipe. Galvanized steel pipe corrosion resistance can increase, prolong service life. Galvanized pipe in addition to water, oil and other general low pressure fluid line pipe, also used in the oil industry, chemical coking equipment of oil heater, the condensing distillation wash oil cooler, coal exchange for tube, and trestle pile, mining tunnel supporting frame tube, etc
Galvanized pipe folding weld process is as follows:
1, if the clearance is too large, resulting in a decrease of proximity effect, eddy heat is insufficient, the joint between the weld crystal bad and incomplete fusion or crack generation.
2, such as the gap is too small, it side impact beams increases proximity effect, welding heat is too big, cause the burning of the weld; Or weld after extrusion, rolling the deep pit formation, affect the surface quality of the galvanized pipe weld.
Two edges of billet heating to welding temperature, under the extrusion of squeezing roller, to form a common metal grain interpenetrate, crystallization, forming solid weld. If galvanized pipe extrusion pressure is too small, the amount of common crystal small, weld metal strength, stress produces after cracking; If the extrusion pressure is too large, will make molten metal being squeezed out of the seam, not only reduce the weld strength, and can produce a large number of inside and outside burr, may cause welding lap seam, etc.
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