Improved steel tube and hubbed flange butt joint submerged arc welding method

A technology of submerged arc welding and flanges, which is applied to welding equipment, arc welding equipment, and the edge of workpieces, etc., can solve problems affecting welding quality, slow welding speed, and easy to be affected by moisture and oxidation, so as to increase welding speed and reduce filling Quantity, the effect of improving the working environment

Active Publication Date: 2015-10-21
GUANGZHOU ZENGLI STEEL STRUCTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above, an improved butt submerged arc welding method of steel pipe and neck flange can be provided, which can effectively solve the problems existing in the prior art, especially complex process, cum

Method used

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  • Improved steel tube and hubbed flange butt joint submerged arc welding method
  • Improved steel tube and hubbed flange butt joint submerged arc welding method
  • Improved steel tube and hubbed flange butt joint submerged arc welding method

Examples

Experimental program
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Effect test

Example Embodiment

[0024] Experimental example 1, the influence of the distance between the end faces of the welded joint on the welding effect.

[0025] In the invention, weldments with a thickness of 8-24mm were selected, and the distances between the welding end faces were set to 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0mm, and the conventional welding conditions were used for welding. The results showed: When the distance between the end faces of the welded joint is less than 1mm, the high current will not only burn through the weldment, and the weld metal has the best strength and toughness.

Example Embodiment

[0026] Experimental example 2, the influence of welding current, arc voltage and welding speed on the welding effect

[0027] In the invention, weldments with a thickness of 8-24mm were selected, and the welding wire was 3.2-5mm straight. Welding was carried out with different welding currents, arc voltages and welding speeds. The results showed that the welding current was 510-900A, and the arc voltage was 29-36V. When the welding speed is 32~60cm / min, the sawtooth shape of the fractured section of the weldment joint obtained is better;

Example Embodiment

[0028] Experimental example 3, the influence of the distance between the center line of the inner and outer welding gun displacement tube on the weld formation

[0029] The pipe diameter selected when invented was Welding parts using the welding parameters in Experimental Example 2 were used to move the inner and outer welding guns at different distances during welding. The results showed that: when the pipe diameter is greater than or equal to 325mm and less than or equal to 1016mm, the inner (outer) welding gun displacement is 15~75mm ( With the increase of pipe diameter, the displacement distance also increases) and when welding in an up (down) slope state, the appearance of the weld is smooth and uniform, and can meet the requirements of level 1 of weld appearance quality;

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Abstract

The invention provides an improved steel tube and hubbed flange butt joint submerged arc welding method. The improved steel tube and hubbed flange butt joint submerged arc welding method comprises the steps of groove machining, joint grinding, splicing, positioned welding, welding of an outer circular seam, welding of an inner circular seam, crack detection and the like. The improved steel tube and hubbed flange butt joint submerged arc welding method can effectively solve the problems in the prior art, especially the problems that the process is complex, the procedures are tedious, operation difficulty is large, the welding speed is low, welding parts are prone to being affected with damp and oxidation in the placement process to generate pores in the welding process after being subjected to spot welding, and accordingly the welding quality is affected.

Description

technical field [0001] The invention relates to the technical field of welding processing, in particular to a submerged arc welding method for circumferential butt joint welding of steel pipes and flanges with necks in the steel pipe tower components of UHV transmission lines. Background technique [0002] In recent years, domestic UHV transmission lines are in a period of rapid development, and steel pipe towers are more and more widely used in UHV transmission lines. According to reports, the China Electric Power Research Institute has shown that the application of the neck flange to the steel pipe tower of the transmission line is feasible and safe through the true test results of the steel pipe and the neck flange member. Therefore, a strong technical guarantee is provided for the popularization and application of neck flanges for UHV steel pipe towers. for Butt welding of steel pipes with a pipe diameter of 8mm and above and a neck flange is quite large, and the weld...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K9/16B23K9/235B23K33/00B23K9/028
CPCB23K9/0282B23K9/16B23K9/18B23K9/235B23K33/00
Inventor 张帝起张洋
Owner GUANGZHOU ZENGLI STEEL STRUCTURE
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