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A welding treatment method suitable for steel pipe and steel pipe oblique combined forming

A processing method and a technology for steel pipes, which are applied in the field of steel pipe welding, can solve problems such as inconvenient qualitative inspection of the internal quality of welds, large gaps between steel pipes and steel pipes, and difficulty in ensuring welding quality, etc., so as to facilitate flaw detection and eliminate welding residues Effects of reducing stress and reducing the difficulty of welding construction

Active Publication Date: 2018-07-03
CHINA GEZHOUBA GROUP MACHINERY & SHIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the combination weld of steel pipe and steel pipe oblique, this kind of weld belongs to the all-position welding in the air, and the angle of the groove at each point of the entire groove surface is different. Not only is it very difficult to process the groove, but also It is not easy to guarantee the welding quality due to the change of angle
[0004] The traditional process uses the whole circle of beveling. In order to ensure penetration, the electrode or welding wire of the manual welding operation must be able to extend to the bottom, resulting in a very large gap between the steel pipe and the steel pipe when the bevel is made, which is often unfused and unwelded. where concentration occurs
In addition, it is not convenient to conduct a qualitative inspection of the internal quality of the weld
This makes the mitered joints of steel pipes a weak point in the quality control of the entire grid structure. Poor quality is likely to cause safety hazards and cause safety accidents

Method used

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  • A welding treatment method suitable for steel pipe and steel pipe oblique combined forming
  • A welding treatment method suitable for steel pipe and steel pipe oblique combined forming
  • A welding treatment method suitable for steel pipe and steel pipe oblique combined forming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Such as Figure 5 Shown: When the welded rod is in a horizontal position, the weld is basically a horizontal welding position, and the manual welding technique in this position is easy to master. First, prepare the grooves in the manufacturing plant according to the design, and temporarily use the angle grinder to grind the grooves on the rods that need to be partially trimmed; then, tighten the assembly and perform multi-point spot welding on the welds for welding. ready. Secondly, welding is performed: the first pass realizes the bottom welding, and the symmetric welding completes the entire circle of welding; the subsequent welding is completed by the segmented welding method, multi-layer and multi-pass welding according to the divided weld area.

Embodiment 2

[0057] Such as Image 6 Shown: when the welded rod is in the vertical position and the top area is at the bottom, the top area θ 1 The range is the horizontal welding position, the side area θ 2 Uphill welding position, the root area θ 3 For flat fillet welding position, the top area of ​​the welding joint θ 1 The welding is the most difficult. The previous preparation work is the same as that in Example 1. The welding sequence used in the welding process is: 1). Bottom welding: symmetric welding to complete the entire circle of welding. 2) Adopt segmented welding method, multi-layer and multi-pass welding: firstly, symmetric welding is completed θ 2 Zone weld; then, weld θ 3 For the flat fillet weld in the area, the welding thickness reaches half; secondly, the welding is completed θ 1 Upside down welding of the area; finally, complete θ 3 Welding of flat fillet welds. 3), cover welding: the whole weld cover the surface. If the welding sequence is completed in this way, the qu...

Embodiment 3

[0059] Such as Figure 7 Shown: When the welded rod is in the vertical position and the top area is on the upper part, the root area θ 3 The range is the horizontal welding position, the side area θ 2 For upward slope welding, the top area θ 1 For flat fillet welding position. Since the root area θ 3 It belongs to the acute-angle horizontal welding position, and the transportation and the line of sight are not very good, and the welding seam operation is particularly difficult. The welding sequence used in the welding process is: 1). Bottom welding: first in the flat fillet welding position θ 1 In the root area θ 3 The bottom of the zone and the horizontal welding position are sealed and welded together. 2) Adopt segmented welding method, multi-layer and multi-pass welding: firstly, symmetric welding is completed θ 2 Zone weld; then, weld the top θ 1 The flat fillet weld in the area, the welding thickness reaches half; secondly, the root of the welding is completed θ 3 Upside do...

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Abstract

The invention provides a welding treatment method suitable for oblique crossing combined forming of steel pipes. According to the welding treatment method, local grooving is carried out on joints of the steel pipes crossed obliquely to avoid the problem that the welding quality cannot be ensured due to great welding difficulty caused by the whole ring of groove welding, thereby improving working efficiency and welding quality.

Description

Technical field [0001] The invention relates to a steel pipe welding method, in particular to a welding treatment method suitable for the oblique combined forming of the steel pipe and the steel pipe. Background technique [0002] The grid structure is a space structure formed by multiple rods connected by nodes in a certain grid form. It belongs to a space hinged rod system. It has multiple ultra-stable space structures. It has a high degree of industrialization, light weight, good stability, and appearance. Beautiful features. The members of the grid structure can participate in the work and have good mechanical performance. Its rigidity and stability are better than the general plane structure, and can effectively bear various asymmetric loads, concentrated loads, and dynamic loads. The overall force characteristics of all the members of the grid structure make the space rigidity large, so the seismic performance is good. [0003] The disadvantage of the grid structure is that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/235B23K9/032B23K9/173
CPCB23K9/032B23K9/173B23K9/235B23K2101/06
Inventor 张建中刘桂芳高顺阶左琛汪勇军
Owner CHINA GEZHOUBA GROUP MACHINERY & SHIP
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