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Method for controlling welding quality of large thick-wall cold-bent square or rectangular pipe

A technology for welding quality, square and rectangular tubes, applied in welding equipment, high-frequency current welding equipment, manufacturing tools, etc., to achieve the effect of maintaining mechanical properties, improving production efficiency, and excellent welding quality

Inactive Publication Date: 2010-10-20
TAIAN KENUO PROFILE STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no process method that can control the welding quality of large thick-walled square rectangular high-frequency welded pipes through calculation.

Method used

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  • Method for controlling welding quality of large thick-wall cold-bent square or rectangular pipe
  • Method for controlling welding quality of large thick-wall cold-bent square or rectangular pipe
  • Method for controlling welding quality of large thick-wall cold-bent square or rectangular pipe

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Experimental program
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Effect test

Embodiment 1

[0016] Embodiment 1: The size of the square rectangular tube is 150×150×4mm, the opening angle α is 2.9°, the wall thickness d is 4mm, and the input surface energy Ea is 3.5W / (mm 2 / min), the welding speed v is 14m / min, and the extrusion amount is 1mm.

Embodiment 2

[0017] Embodiment 2: The size of square rectangular tube is 250×250×11.8mm, the opening angle α is 3.1°, the wall thickness d is 11.8mm, and the input surface energy Ea is 4.0W / (mm 2 / min), the welding speed v is 10m / min, and the extrusion amount is 1mm.

Embodiment 3

[0018] Embodiment 3: The size of the square rectangular tube is 250×250×9.8mm, the opening angle α is 3.0°, the wall thickness d is 9.8mm, and the input surface energy Ea is 3.8W / (mm 2 / min), the welding speed v is 12m / min, and the extrusion amount is 1mm.

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Abstract

The invention discloses a method for controlling the welding quality of a large thick-wall cold-bent square or rectangular pipe. High-frequency welding is conducted at an open angle, the welding quality is calculated and analyzed by using the energy of a novel technological parameter input plane which integrates comprehensive input power, welding speed and pipe wall thickness into a whole body, and the welding quality is optimal when the energy of the input plane is within a reasonable value range. The invention provides a convenient and effective process parameter for high-frequency butt-seam welding.

Description

technical field [0001] The invention relates to a processing method of cold-formed steel, in particular to a method for controlling the welding quality of large thick-walled cold-formed square rectangular high-frequency welded pipes. Background technique [0002] Square and rectangular welded steel pipes are widely used as steel components in truss structure systems and curtain wall support systems in airport terminals, stadiums and exhibition centers due to their beautiful appearance, reasonable stress, and relatively simple joint processing. With the rapid development of the cold-formed industry, the construction industry implements new standards, and puts forward higher requirements for cold-formed steel, including mechanical properties. The welded joint is the weakest link in the mechanical properties of the welded part. It is necessary to improve the mechanical properties of the welded part. Performance, the first is to improve the mechanical properties of welded joints...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K13/00
Inventor 周绪昌张恒李立新赵勇
Owner TAIAN KENUO PROFILE STEEL