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Method for welding composited tube at bonding interface of carbon steel/stainless steel machinery

A technology of interface compounding and welding method, which is applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of increasing the difficulty of welding of composite pipes, difficult alignment of base layer and lining layer, low pass rate of flaw detection, etc. Excellent mechanical properties and corrosion resistance, avoid oxidation, and facilitate construction

Active Publication Date: 2010-02-24
XIAN SUNWARD AEROSPACE MATERIAL
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] At present, in the welding process of carbon steel / stainless steel mechanically bonded interface composite pipe, the commonly used welding process is to open a V-shaped groove on the pipe end of the composite pipe, and then carry out butt welding. The difficulty of welding, the position of the base layer and the lining layer are difficult to align, and the welding quality is poor, and the first pass rate of flaw detection is low

Method used

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  • Method for welding composited tube at bonding interface of carbon steel/stainless steel machinery
  • Method for welding composited tube at bonding interface of carbon steel/stainless steel machinery
  • Method for welding composited tube at bonding interface of carbon steel/stainless steel machinery

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Embodiment 1

[0061] In this embodiment, the welded carbon steel / stainless steel mechanical bonding interface composite pipe 10 is a composite pipe composed of a stainless steel lining pipe 1 made of 316L stainless steel and a carbon steel base pipe 2 made of 20G carbon steel, and Its specification is Φ76×(7+2)mm.

[0062] Step 1. Welding groove treatment, the treatment process is as follows:

[0063] 101. Using conventional mechanical processing methods, remove a section of 10mm long stainless steel lining pipe 1 from the outside to the inside at the end of the carbon steel / stainless steel mechanical bonding interface composite pipe 10 to be welded.

[0064] 102. Process the inner side of the exposed carbon steel base pipe 2 after removing the stainless steel lining pipe 1 to form an inwardly inclined slope from the outside to the inside, and the slope angle α of the slope is 5°. For details, see figure 2 .

[0065] 103. Under the protection of argon gas, a TIG manual DC tungsten argon ...

Embodiment 2

[0080] In this embodiment, the welded carbon steel / stainless steel mechanical bonding interface composite pipe 10 is a composite pipe composed of a stainless steel lining pipe 1 made of 316L stainless steel and a carbon steel base pipe 2 made of 20G carbon steel, and Its specification is Φ56×(5+1.5)mm. The difference from Example 1 is: in step 101, a conventional mechanical processing method is adopted, and at the end of the carbon steel / stainless steel mechanically bonded interface composite pipe 10 to be welded, a section of stainless steel lining pipe 1 with a length of 8 mm is removed from the outside to the inside; In step 102, the inclination angle α of the inclined surface processed from outside to inside is 3°; in step 103, the welding current during surfacing welding is 90A, and the flow rate of shielding gas used in the welding process is 13L / min. After the surfacing welding is completed, a total of 3 layers of stainless steel surfacing welding layers 3 are formed on...

Embodiment 3

[0086] In this embodiment, the welded carbon steel / stainless steel mechanical bonding interface composite pipe 10 is a composite pipe composed of a stainless steel lining pipe 1 made of 316L stainless steel and a carbon steel base pipe 2 made of 20G carbon steel, and Its specification is Φ96×(9+3)mm. The difference from Example 1 is that in step 101, a conventional mechanical processing method is adopted, and at the end of the carbon steel / stainless steel mechanically bonded interface composite pipe 10 to be welded, a section of stainless steel lining pipe 1 with a length of 13 mm is removed from the outside to the inside; step In step 102, the inclination angle α of the inclined surface processed from the outside to the inside is 8°; the welding current during the surfacing welding in step 103 is 90A, and the flow rate of the shielding gas used in the welding process is 17L / min. After the surfacing welding is completed, a total of 5 layers of stainless steel surfacing welding...

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Abstract

The invention discloses a method for welding composited tube at the bonding interface of carbon steel / stainless steel machinery, comprising the following steps: 1. welding groove treatment as follows:removing a section of stainless steel lined tube; processing the interior of the carbon steel parent tube exposed outside after removing the stainless steel lined tube into an inclined plane inclinedinwards from exterior to interior; using a tungsten electrode argon arc welding machine to carry out bead weld on the inclined plane from interior to exterior and forming multiple stainless steel bead weld layers; processing the weld surface of the carbon steel parent tube into a V-shaped groove; 2. backing weld: when fitting up the stainless steel bead weld layers before backing weld, adopting the tungsten electrode argon arc welding machine to carry out fitting-up and fixing in a manner of spot welding; 3. transition weld; and 4. carbon steel parent tube weld. The invention features simpleprocedure steps, less used weld materials, high weld pass percentage, good welding line mechanical property, high weld quality and improved production efficiency simultaneously.

Description

technical field [0001] The invention belongs to the technical field of welding technology, and in particular relates to a welding method for a carbon steel / stainless steel mechanically bonded interface composite pipe. Background technique [0002] At present, in the welding process of carbon steel / stainless steel mechanically bonded interface composite pipe, the commonly used welding process is to open a V-shaped groove on the pipe end of the composite pipe, and then carry out butt welding. Due to the difficulty of welding, the positions of the base layer and the lining layer are difficult to align, and the welding quality is poor, and the first pass rate of flaw detection is low. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a welding method for a carbon steel / stainless steel mechanically bonded interface composite pipe in view of the deficiencies in the above-mentioned prior art. Excellent mechanical propert...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K33/00B23K9/235B23K9/095B23K35/362
Inventor 张燕飞王小艳潘建新倪裕雷梁国栋
Owner XIAN SUNWARD AEROSPACE MATERIAL
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