Welded steel pipe or plate are commonly welded by means of bent round, we can weld the steel into square and other shapes and then welded into the surface of the DSAW stee： pipe seam. Steel plate or steel pipe is used in the blanks of welded steel. We can use electric arc welded pipe, high or !ow frequency electric resistance welded pipe, gas pipe, stove pipe, Bundy tubes according to different methods.
Here we talk about how to welded steel pipe. First dean the weld oil, paint, water, rust, etc., and then according to the wall thickness of beveling, opened a large number of thick, thin it to open a small number (angle grinder), and then the gap is on the product, the general 1 rod or wire diameter 1.5 times the groove if you are not careful. You can open big to stay small number of properly. Tack welding at least three points, four points better general work. Welding when welding should be haff and half, the best starting point is about more than the bottom one centimeter, so from across the connector If the wall thickness, it should be layered, at least two layers, the first layer of full circle welding can weld finished second layer.
Precision welded pipe is generally further improved on the basis of the results of welded pipe products are fine products. Compare with general pipe, its main characteristics and are: a precise geometry, the lateral wall thickness, steel good shape, small ellipse, reliable weld quality within months of small glitches, the outer surface smooth, steel weld heat treatment or by protection, after the heat treatment atmosphere, without oxygen can reach the surface, the mechanical properties of a stable and uniform microstructure effects, its production cost than similar seamless precision steel tubes are much lower, or may be directly processed by a small amount for some devices, reduce the cost of processing equipment.
Precision pipe production in three v/ays: first production: the tube (sheet, strip) molded directly welded into the pipe, and its main processes strip forming, welding, sizing. Features: less production processes, engineering process is simple, short product cycles, product accuracy is slightly lower. The second mode of production: from the tube (sheet, strip) first soldered directly into a certain size pipe, and then through cold drawn or cold rolled into finished tubes, welded steel pipe known as OOM.
The main processes are forming, welding, sizing, cold-rolled or cold-drawn (with a mandrel or without mandrel), or continuous drawing (that is welding – drawing combined production line). Features: decentralized production processes , long process and production cycle, large area, the dimensional accuracy of the product is good, smooth inner and outer surfaces , mechanical properties and microstructure good state .The third mode of production: from the tube (sheet, strip) first into a certain size pipe welded directly, then entering the continuous cold reducing mill reducing a finished tube. The main processes are forming, welding, continuous cold- reducing. Features: Compact production processes, process simplicity, high efficiency units, fast conversion specification range for the production of small diameter and thin-walled welded steel pipe. The carbon steel pipe and API steel pipe are also available.
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Post time: Nov-26-2020