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Full penetration welding process

A welding process and full penetration technology, which is applied in the field of steel bridge manufacturing, can solve problems such as reduced work efficiency and imperfect welding process, and achieve the effects of welding quality assurance, excellent appearance forming, and improving the quality of U-rib welds

Inactive Publication Date: 2016-03-30
SHANGHAI ZHENHUA HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention can achieve full penetration, but it needs to use double-sided complete penetration welding, resulting in a decrease in work efficiency, and the welding process is not perfect; and the welding process using single-sided fillet welds is limited by the current welding process And the workpiece characteristics of U-rib, often can only reach 80% penetration, and the root of the fillet weld cannot be welded because it is located in the narrow space of U-rib, so it is urgent to develop a full-penetration with perfect technology, good welding quality and high efficiency Welding process, after searching, no technical solution identical or similar to the present invention was found

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The invention discloses a full penetration welding process, which is specifically as follows:

[0024] (1) Polish and clean the rust, oil stain, paint and oxide skin on the area to be welded on the upper end surface of the device to be welded and within 20-30mm on both sides to reveal the metallic luster;

[0025] (2) Put the U rib upside down on the device to be welded. At this time, an assembly groove is formed between the bottom end of the U rib and the upper surface of the device to be welded. The angle of the assembly groove is 47o;

[0026] (3) Use a solid welding wire with a dry elongation of 20mm to perform deep penetration welding in the flat position to form a bottom weld. First, place the polyarc pulse deep penetration welding machine on the outside of the U rib, and align the welding torch with the assembly groove. position, and then place a solid welding wire with a diameter of 1.2mm on the root of the assembly groove, turn on the welding torch and adjust t...

Embodiment 2

[0030] The only difference between this embodiment and Embodiment 1 is that the gases introduced during welding in step (3) or step (4) are selected from argon and CO 2 A mixture of gases, where CO 2 The volume percentage is 18-25%, and the gas flow rate is controlled at 15-20L / min.

Embodiment 3

[0032] The only difference between this embodiment and Embodiment 1 is that in step (4) when welding the cover surface, flux-cored wire is used to weld at the boat-shaped position, ensuring that the included angle between the device to be welded and the horizontal plane is 30-45o, and the welding current It is 270A, the welding voltage is 28.5V, and the welding speed is 328mm / min.

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Abstract

The invention relates to a full penetration welding process. On the condition that the angle of an assembly bevel is 47 degrees, deep penetration welding backing welding is carried out at the downhand position through an arc-gathering pulse deep penetration welding machine by adopting solid wires, and then cosmetic welding is carried out at the downhand position or the boat-shaped position by adopting flux-cored wires. The process has the advantages of mainly realizing full penetration welding of fillet welds of U-shaped ribs with the thickness being 8 mm and being of great significance in improving the mechanical characteristics of the fillet welds of the U-shaped ribs, improving the weld quality of the U-shaped ribs and prolonging service life of bridges. The arc-gathering pulse deep penetration welding machine is mainly adopted for the full penetration welding process, arc permeation can be obviously improved, the power of penetrating the root of the assembly bevel can be improved, and formation of the weld roots can be guaranteed.

Description

Technical field [0001] The present invention involves a full melting welding process, which belongs to the field of steel bridge manufacturing technology. Background technique [0002] The top and bottom plate of the steel box beam generally use the U -shaped rib (hereinafter referred to as the U ribs) vertically.When manufacturing, the steel box beam is generally divided into several beam sections. Each beam section is divided into several board units. Each board unit is a structural piece with several ribs.Four U ribs.According to statistics, the weight of the top and bottom plates accounts for about 70 % of the total weight of the steel box beam. Therefore, the welding production of the top and bottom unit is also an important part of the production of the entire steel box beam.Structure, directly tolerate the transition load from the bridge, so it also requires high anti -fatigue performance. [0003] In the invention patent with the patent number 201110375282.x, a closed -mo...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K9/235
CPCB23K9/173B23K9/0026B23K9/235B23K2101/28
Inventor 马立芬陆汉忠张乐顾福民郭强庞延波杨春松邹纪祥鞠小刚
Owner SHANGHAI ZHENHUA HEAVY IND
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