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Improved butt submerged arc welding method of steel pipe and flange with neck

A submerged arc welding and flange technology, which is applied in welding equipment, arc welding equipment, workpiece edge, etc., can solve the problems of affecting welding quality, easy to be affected by moisture and oxidation, and slow welding speed, so as to increase welding speed and improve work environment, the effect of reducing the amount of filling

Active Publication Date: 2017-07-25
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, cumbersome process, difficult operation, slow welding speed, and When the weldment is placed after spot welding, it is easy to be oxidized by moisture, resulting in pores during welding, which affects the quality of welding

Method used

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  • Improved butt submerged arc welding method of steel pipe and flange with neck
  • Improved butt submerged arc welding method of steel pipe and flange with neck
  • Improved butt submerged arc welding method of steel pipe and flange with neck

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

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

[0025] At the time of the invention, weldments with a thickness of 8 to 24 mm 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, and 4.0 mm, and conventional welding conditions were used for welding. The results showed that: When the distance between the end faces of the welded joint is less than 1 mm, the high current will not burn through the weldment, and the strength and toughness of the weld metal are the best.

experiment example 2

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

[0027] At the time of the invention, weldments with a thickness of 8-24mm were selected, and the welding wire was 3.2-5mm in diameter. Different welding currents, arc voltages and welding speeds were used for welding. 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 zigzag shape of the cross-section of the weldment joint obtained is better;

experiment example 3

[0028] Experimental example 3, the influence of the centerline distance of the displacement tube of the inner and outer welding torches on the weld formation

[0029] The diameter of the pipe selected at the time of invention is For the weldment, using the welding parameters in Experimental Example 2, the inner and outer welding torches are displaced at different distances during welding. The results show that when the pipe diameter is greater than or equal to 325mm and less than or equal to 1016mm, the displacement of the inner (outer) welding torch is 15-75mm ( When the pipe diameter increases and the displacement distance also increases) and is welded in an up (down) slope state, the appearance of the weld is flat and uniform, and can meet the first-class requirements for the appearance quality of the weld;

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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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Patent Type & Authority Patents(China)
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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