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

A technology of interface compounding and welding method, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problems of increasing the welding difficulty of the composite pipe, difficult alignment of the base layer and the lining layer, low one-time pass rate of flaw detection, etc. Excellent mechanical properties and corrosion resistance, avoiding oxidation and facilitating construction

Active Publication Date: 2011-07-20
XIAN SUNWARD AEROSPACE MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 Ф76×(7+2)mm.

[0062] Step one, welding groove treatment, the treatment process is as follows:

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

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

[0065] 103. Under argon protection, use ...

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 embodiment 1 is that: in step 101, a conventional machining method is used, at the end of the composite pipe 10 at the carbon steel / stainless steel mechanical bonding interface to be welded, a section of stainless steel lining pipe 1 with a length of 8 mm is removed from outside to inside; In 102, the inclination angle α of the inclined plane processed from the outside to the inside is 3°; the welding current during surfacing in step 103 is 90A, and the flow rate of the shielding gas used in the welding process is 13L / min. After the surfacing welding is completed, a total of three stainless steel surfacing layers 3 are formed from the inside to the outside 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 embodiment 1 is: in step 101, a conventional machining method is used, at the end of the composite pipe 10 at the carbon steel / stainless steel mechanical bonding interface 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; In 102, the inclination angle α of the inclined surface processed from the outside to the inside is 8°; the welding current during surfacing in step 103 is 90A, and the flow of shielding gas used in the welding process is 17L / min. After the surfacing is completed, a total of 5 layers of stainless steel surfacing 3 are formed from the inside to the outside on the inclined s...

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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 inclined inwards 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 mechanical bonding interface composite pipe. Background technique [0002] At present, in the welding process of carbon steel / stainless steel mechanical bonding interface composite pipe, the commonly used welding process is to open a V-shaped groove at the pipe end of the composite pipe and then perform butt welding. This method adds a composite pipe that uses a mechanical method to composite. The welding difficulty is difficult, 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. Summary of the invention [0003] The technical problem to be solved by the present invention is to provide a carbon steel / stainless steel mechanical bonding interface composite pipe welding method for the above-mentioned deficien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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 CO LTD
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