Steel strip edge processing method for high-frequency welded pipe and welded pipe production process

A technology of production process and processing method, which is applied in the field of high-frequency welded steel strip edge processing and high-frequency welded pipe production technology, can solve problems such as unstable weld quality, eliminate weld quality problems, and reduce cold welding defects. , The effect of uniform welding temperature distribution

Inactive Publication Date: 2013-01-23
CHINA IRON & STEEL RES INST GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of unstable weld seam

Method used

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  • Steel strip edge processing method for high-frequency welded pipe and welded pipe production process
  • Steel strip edge processing method for high-frequency welded pipe and welded pipe production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] For small-diameter high-frequency welded pipe high-frequency resistance welded steel pipe production units, use such as Figure 1a The production unit shown does not have an edge milling machine. This unit is used to produce high-frequency welded pipes with a diameter of 20mm and a wall thickness of 5mm. The material is 10#, 20#, 45#, Q195 or Q235.

[0024]After the raw materials are uncoiled, they are slit into steel strips according to the required specifications. For example, slitting is carried out according to the diameter of the steel pipe of 20mm, and a certain margin (for example, 0.5mm-1.0mm) is left during the slitting to facilitate the subsequent accurate edge processing; subsequently, utilize the present invention to carry out the zone that the steel strip after slitting will be welded, heat-affected zone such as the zone of uneven tissue distribution at the welded joint and other zones that can affect the quality of the weld seam carry out edge treatment, lon...

Embodiment 2

[0027] For medium and large diameter high-frequency welded pipe high-frequency resistance welded steel pipe production units, use such as Figure 1a The production unit shown without edge milling machine is used to produce high-frequency welded pipes with a diameter of 800mm and a wall thickness of 20mm, and the materials are 10#, 20#, 45#, Q195 or Q235.

[0028] Same as Example 1, after the raw material is uncoiled, it is longitudinally cut into steel strips according to the required specifications, the steps of longitudinal cutting are the same as in Example 1, and the remaining margin of longitudinal cutting is determined according to the subsequent steps; in this embodiment, steel strips are used Brush and grinding wheel to grind off the thickness of the steel strip surface about 1mm, remove the burr on the edge of the steel strip and the micro cracks and metal separation layer formed at the section, remove oil stains and other defects, and remove the edge of the steel strip...

Embodiment 3

[0032] For the production line of medium and large-diameter high-frequency welded pipe high-frequency resistance welded steel pipes that have used edge milling machines, such as Figure 1b As shown, the production of high-frequency welded pipes with a diameter of 1400mm and a wall thickness of 20mm is made of 10#, 20#, 45#, Q195 or Q235.

[0033] After the raw material is uncoiled, it is slitting into steel strips according to the required specifications, and the slitting steps are the same as in the previous embodiment; then, it enters the edge milling machine for edge milling, and after edge milling, the steel strip edge treatment process of the present invention is used for edge treatment , after edge milling, carry out shot peening treatment on the corners of the steel strip, the rust on the upper and lower surfaces, and the residual adhesion dirt, etc., wherein, the selection of the shot is based on the cast iron shot or cast steel shot commonly used by those skilled in th...

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Abstract

The invention provides a steel strip edge processing method for a high-frequency welded pipe and a welded production process adopting the processing method. The steel strip edge processing method for the high-frequency welded pipe comprises the following step of: performing mechanically or chemically processing the welded area and heat-affected area of a steel strip edge to be subjected to high-frequency welding or a specified area with an edge processing requirement to remove burr, scale cinder and adhered contaminants from the processed area. By the method, the welded area of the steel strip edge of the high-frequency welded pipe can be kept clean, the temperature of the welded area is uniformly and rationally distributed, the quality stability of the high-frequency welded pipe is improved, and the quality of a welding seam is greatly improved.

Description

technical field [0001] The invention relates to the technical field of high-frequency welding, in particular to a method for processing the edge of a high-frequency welded steel strip and a high-frequency welded pipe production process including the method. Background technique [0002] High-frequency welding is a new welding process that uses the skin effect and proximity effect generated by high-frequency current to connect steel plates and other metal materials. It is a key process in the production of longitudinal welded pipe (ERW). High-frequency welded pipes produced by high-frequency welding are used in practice to transport low-pressure and high-pressure fluids, as well as transport corrosive media, so the requirements for the quality of welded pipes are very high. The quality of weld seam in high-frequency welding directly affects the overall strength, quality grade and production speed of welded pipe products. The quality of the weld seam in high-frequency weldin...

Claims

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Application Information

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IPC IPC(8): B23P15/00B23K13/00
Inventor 韩宝云王金飞李殿杰李胜峰
Owner CHINA IRON & STEEL RES INST GRP
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