Pipe fitting butt welding protecting method and apparatus

A technology of protective devices and pipe fittings, applied in welding equipment, auxiliary devices, auxiliary welding equipment, etc., can solve the problems of wasting welding protective gas, long inflation time, affecting welding efficiency, etc., and achieve the effect of improving efficiency and reducing consumption

Inactive Publication Date: 2008-12-17
中船海洋与防务装备股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires the use of a large amount of welding shielding gas, especially when the pipe fittings to be joined are long, to exhaust the air in the inner cavity of the pipe fittings with both ends closed and fill them with welding shielding gas, a large amount of welding shielding gas is required, while requiring a long inflation time
For infusion pipelines on ships, the pipe fittings are often tens of meters or even tens of meters long. To meet the welding requirements, sometimes it is necessary to continuously fill the inner cavity of the pipe fittings with welding shielding gas for several hours before welding, which is wasteful. A large amount of welding shielding gas greatly affects the efficiency of welding

Method used

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  • Pipe fitting butt welding protecting method and apparatus
  • Pipe fitting butt welding protecting method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A pipe fitting butt welding protection device, as shown in Figure 1, has two inflatable airbags 2 installed on both sides of the pipe fitting butt joint 1, the two airbags are connected to each other, and each airbag is connected with its own expansion tube 3, through the expansion tube 3 Inflating the gas can make the two airbags 2 expand and cling to the pipe wall 4, thereby forming a cavity 5 separated from the outside world with the pipe wall. The airbag is also equipped with an inflation pipe 6 and an exhaust pipe 7 that run through the airbag. The welding protection Gas can be charged into the cavity 5 through the gas filling tube 6 , and the air in the cavity 5 can be discharged through the exhaust tube 7 .

[0018] When the pipe fittings are butt welded, first insert the pipe fitting butt welding protection device into one of the butt pipe fittings, and then pull the protection device to the direction of the other pipe fitting to the butt joint of the pipe fittin...

Embodiment 2

[0022] A butt welding protection device for pipe fittings, as shown in Figure 4, differs from Embodiment 1 in that the two airbags 2 are independent and not connected to each other, and are the same as Embodiment 1 in other respects.

[0023] Because the pipe fittings welded to the pipe are sometimes very long, the installation method of installing the pipe welding protection device from one end and then pulling it to the welding seam in the first embodiment is sometimes very inconvenient. Not only is it difficult to install the pulling rope that extends from the other end of the pipe, but it is also difficult to control the distance that the protective device is pulled. position on both sides of the seam. In this embodiment, the two airbags are separated independently. When the pipes are welded, the two airbags can be directly put into the two pipes respectively from the welding ends of the two pipes.

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Abstract

The invention relates to a protection device for pipe fitting butt welding, comprising two balloons communicated with an expandable tube; by charging gas to the balloons through the expandable tube, the balloons are expanded and closely adhere to the wall of the tube; a gas filling tube passes through the balloons, which can fill in welding protective gas to the cavity formed between the pipe wall and the two balloons after the balloons are expanded; an exhaust pipe also passes through the balloons, and the gas in the cavity can be exhausted to the outside by the exhaust pipe. When butt welding of pipe fittings is performed, the two balloons are respectively arranged at both sides of a joint, and the two balloons are charged with gas through the expandable tube; the expanded balloons and the inner wall of the pipe fitting press closely, and an independent cavity can be formed between the expanded balloons and the pipe wall; welding protective gas is charged into the cavity by the gas filling tube, meanwhile the air in the cavity is exhausted by the exhaust pipe; when the cavity is completely filled with the welding protective gas, welding can be performed. The protection device of the invention greatly reduces the amount of the welding protective gas, simultaneously shortens air emptying time before welding and gas filling time of the welding protective gas greatly, therefore welding efficiency is improved.

Description

technical field [0001] The invention relates to a method for protecting the pipe fittings to prevent the seams from being oxidized during butt welding of pipe fittings; and a device for protecting the butt welding of pipe fittings using the method. technical background [0002] When pipe fittings are butt welded, the joints are easily oxidized at high welding temperatures, which affects their mechanical properties and corrosion resistance. In order to prevent the joints of the two pipes from being oxidized during the welding process, so that the joints also have excellent performance, usually the butt-joined pipes are closed from both ends during welding, and nitrogen gas is filled into the entire closed pipe cavity. The welding shielding gas evacuates the original air in the pipe, so that the cavity after the exhausted air is filled with welding shielding gas such as nitrogen, so as to prevent the oxidation of the seam. However, this method requires the use of a large amou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K37/00
Inventor 何家骥康新忠
Owner 中船海洋与防务装备股份有限公司
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