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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

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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 effectively solve the defects of existing welding methods such as high labor intensity, low efficiency, high production cost, serious oxidation of the weld joint, poor internal and external forming of the weld, difficult control of the internal cleanliness of the pipeline, and poor cleanliness control effect. insufficient

Method used

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

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Effect test

Embodiment 1

[0042] Such as figure 1 An automatic non-mark welding process for a thin-walled stainless steel clean pipeline includes the following steps:

[0043] Step 1. Welding port treatment: milling the welded faces of the pipe ends of the two pipe sections to be welded into a plane; the two pipe sections are stainless steel pipes, and the outer diameter and wall thickness of the two pipe sections are They are all the same, and the outer diameter of the pipe segment is Φ6.3mm˜Φ190.5mm and its wall thickness is not greater than 3mm.

[0044] In this embodiment, the outer diameters of the two pipe segments are Φ16mm˜Φ18mm and the wall thickness is 0.64mm.

[0045] Before the 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 pipeline section must be sealed with clean plastic before and after processin...

Embodiment 2

[0090] In this embodiment, the difference from Embodiment 1 is that the argon gas supply device described in step 3 has a gas flow rate of 5 L / min; when welding in step 402, the argon tungsten arc welding machine The protruding length of the tungsten electrode is d1=0.8mm, and the distance between the front end of the tungsten electrode and the welding position is d2=0.8mm. The arc length of the argon tungsten arc welding machine is preferably 0.74mm. The rotation speed is 6.0rpm and the welding time is 13s; in step 401, step 402 and step 403, the gas flow rate of the argon gas supply into the argon gas supply equipment is 5L / min, and the argon gas supply equipment into the argon gas 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 Example 1.

Embodiment 3

[0093] In this embodiment, the difference from Embodiment 1 is that: the argon gas supply equipment described in step 3 has a gas flow rate of 14 L / min; when welding in step 402, the gas tungsten arc welding machine The protruding length of the tungsten electrode is d1=1.2mm, and the distance between the front end of the tungsten electrode and the welding position is d2=1.2mm. The arc length of the argon tungsten arc welding machine is preferably 0.78mm. The rotation speed is 7.2rpm and the welding time is 10s; in step 401, step 402 and step 403, the gas flow rate of the argon gas supply into the argon gas supply equipment is 14L / min, and the argon gas supply equipment into the 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 Example 1.

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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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