Automatic traceless fusion welding technology of thin-wall stainless steel clean pipeline

A stainless steel and pipeline technology, which is applied in the field of automatic traceless fusion welding process for thin-walled stainless steel clean pipelines, can solve the problems of difficult control of pipeline cleanliness, poor cleanliness control effect, and poor internal and external welding seam forming, so as to ensure cleanliness and smoothness. Brightness, saving argon consumption, fast welding speed

Active Publication Date: 2013-07-17
SCEGC EQUIP INSTALLATION GRP COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an automatic non-mark welding process for thin-walled stainless steel clean pipelines, which is reasonable in design, easy to operate, convenient to implement, and has a good control effect on pipeline cleanliness. High quality, which can e

Method used

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  • Automatic traceless fusion welding technology of thin-wall stainless steel clean pipeline

Examples

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Example Embodiment

[0041] Example 1

[0042] Such as figure 1 The automatic non-marking welding process for thin-walled stainless steel clean pipes shown includes the following steps:

[0043] Step 1. Welding port treatment: milling the pipe end welding faces of the two pipe segments to be welded into a plane; the two pipe segments are stainless steel pipes, and the outer diameter and wall thickness of the two pipe segments All the same, the outer diameter of the pipe segment is Φ6.3mm~Φ190.5mm, and the wall thickness is no more than 3mm.

[0044] In this embodiment, the outer diameters of the two pipe segments are Φ16mm~Φ18mm and their wall thicknesses are 0.64mm.

[0045] Before actual welding port treatment, the pipe segment to be welded needs to be prefabricated, and the prefabrication process must be carried out in a clean room. The purpose of the prefabrication is to minimize the welding workload on site. The pipe segments must be sealed with clean plastic before and after processing or during i...

Example Embodiment

[0089] Example 2

[0090] In this embodiment, the difference from embodiment 1 is: the argon gas flow rate of the argon gas supply device in step 3 is 5L / min; when welding is performed in step 402, the tungsten argon arc welding machine The protruding length of the tungsten electrode is d1=0.8mm, and the distance between the tip of the tungsten electrode and the welding position d2=0.8mm, the arc length of the tungsten electrode argon arc welding machine is preferably 0.74mm, and the length of the two pipe segments The rotation speed is 6.0 rpm and the welding time is 13 s; in step 401, step 402, and step 403, the argon gas flow rate of the argon supply device is 5L / min, and the argon gas supply device is supplied with argon. The flow rate is 25mm / s, and t1=t2=15s.

[0091] In this embodiment, the remaining process steps and process parameters are the same as those in the first embodiment.

Example Embodiment

[0092] Example 3

[0093] In this embodiment, the difference from embodiment 1 is: the argon gas flow rate of the argon gas supply device in step 3 is 14L / min; when welding is performed in step 402, the tungsten argon arc welding machine The protruding length of the tungsten electrode is d1=1.2mm, and the distance between the tip of the tungsten electrode and the welding position d2=1.2mm, the arc length of the tungsten electrode argon arc welding machine is preferably 0.78mm, and the length of the two pipe segments The rotation speed is 7.2 rpm and the welding time is 10s; in step 401, step 402, and step 403, the argon gas flow rate of the argon gas supply device is 14L / min, and the argon gas supply device is argon gas The flow rate is 35mm / s, and t1=t2=25s.

[0094] In this embodiment, the remaining process steps and process parameters are the same as those in the first embodiment.

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Abstract

The invention discloses an automatic traceless fusion welding technology of a thin-wall stainless steel clean pipeline. The technology comprises the following steps of: step 1, treating a welding port: milling pipe end welding surfaces of two welded pipeline segments into planes; step 2: assembling welded junctions; step 3: carrying out point welding; step 4: carrying out fusion welding: carrying out fusion welding on the two pipeline segments by adopting an argon tungsten-arc welding machine, wherein the fusion welding process comprises the following steps of: introducing a protective gas before welding, welding the two welded pipeline segments by adopting the argon tungsten-arc welding machine, and introducing argon continuously during the welding process and introducing a protective gas continuously after welding; and step 5: sealing and protecting after welding. The automatic traceless fusion welding technology of the thin-wall stainless steel clean pipeline provided by the invention is reasonable in design, is simple and convenient to operate, is convenient to achieve, has a good pipeline cleanness control effect, is high in welding quality, and can effectively solve the problems of high labor intensity, low efficiency, high production cost, severe welding junction oxidation, poor formation inside and outside a welding line, difficulty in controlling cleanness in pipelines, poor cleanness control effect and the like in an existing welding method.

Description

technical field [0001] The invention relates to a clean pipeline welding process, in particular to an automatic traceless fusion welding process for a thin-walled stainless steel clean pipeline. Background technique [0002] In the production process of the electronics industry, a large amount of hydrogen, oxygen, argon, methane, silane, hydrogen chloride, ammonia and other gases must be used, and the purity and cleanliness of these gases are very high, so the transmission of these gases Stainless steel pipes put forward very high requirements. The cleanliness of pipeline construction can directly affect the quality of products, so it is very important to ensure the cleanliness and welding quality of the pipeline construction process. For example, the production process of electronic-grade polysilicon requires the raw materials to operate in an "oil-free, water-free, and dust-free" environment, so the internal cleanliness of the pipelines used is quite high. [0003] In the...

Claims

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Application Information

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IPC IPC(8): B23K31/02
Inventor 吕海林孟坚史均社郭峰祥郑仁宝郑春华
Owner SCEGC EQUIP INSTALLATION GRP COMPANY
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