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Boiler barrel welding method

A welding method and drum technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problem of high repair rate, achieve the effects of reducing repair rate, ensuring product quality, and less air holes

Active Publication Date: 2014-06-18
哈尔滨红光锅炉总厂有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a boiler drum welding method in order to solve the problem that the existing boiler drum adopts X-ray flaw detection after welding and has a high repair rate.

Method used

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specific Embodiment approach 1

[0012] Specific implementation mode one: combine figure 1 Describe this embodiment, this embodiment is the welding method of the first cylinder joint, the method is realized through the following steps: Step 1, the thickness δ of the first cylinder joint 1 to be welded is 26 mm to 28 mm, Both the inside and outside of the barrel joint 1 are grooved, the inside groove is 30°, the outside groove is 45°, the first blunt edge b between the inside groove and the outside groove is 4mm~5mm, and the inside groove Grind and clean both sides and both sides of the outer groove; step 2, roll the first welded tube section 1, and the butt joints must not have gaps; step 3, use the first rolled tube section 1 to be welded Gas shielded welding is performed on the outer side for spot welding, and the spot welding length is 20mm to 40mm; step 4, the inner side of the first welded cylinder section 1 is fully welded by submerged arc automatic welding, where the diameter of the welding wire is 4.0...

specific Embodiment approach 2

[0013] Specific implementation mode two: combination figure 1 To describe this embodiment, the spot welding length in Step 3 of this embodiment is 25 mm to 35 mm. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0014] Specific implementation mode three: combination figure 1 To describe this embodiment, the spot welding length in Step 3 of this embodiment is 30mm. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a method used for welding a boiler barrel, in particular to a boiler barrel welding method in order to solve the problem that due to the fact that in existing boiler barrel welding, X-ray flaw detection is adopted after welding, the back repair rate is high. According to the first scheme, the boiler barrel welding method comprises the steps that 1 the plate thickness of a first welded barrel section is 26 mm-28 mm and grooves are formed in the inner side of a butt-joint opening position and the outer side of the butt-joint opening position respectively; 2 butt joint positions are aligned tightly; 3 spot welding is conducted on the outer side; 4 full-length butt welding is conducted on the inner side; 5 back gouging is conducted on the outer side by the adoption of a carbon arc gouging welding machine; 6 full-length welding is conducted on the outer side, and weld seams are removed through grinding after welding is completed. According to the second scheme; 1 the plate thickness of a second welded barrel section is 16 mm-24 mm, and a groove is formed on the inner side; 2 butt joint positions are aligned tightly; 3 spot welding is conducted on the outer side; 4 full-length welding is conducted on a butt-joint opening of the inner side through automatic submerged arc welding. According to the third scheme; 1 the plate thickness of a third welded barrel section is 8 mm-14 mm, and the position of a butt-joint opening is ground to be neat; 2 butt joint positions are aligned tightly; 3 a coal firing weld bead is welded; 4 full-length welding is conducted on the inner side; 5 back gouging is conducted on weld seams by the adoption of the carbon arc gouging welding machine on the outer side.

Description

technical field [0001] The invention relates to a method for welding boiler shells. Background technique [0002] The existing boiler shell adopts different welding methods for different wall thicknesses; for the shell with a wall thickness of 26mm to 28mm, before welding, the bevel is made on one side. Since it is a thick plate, welding on one side is easy to cause There are many pores after welding, which cannot be repaired. For the cylinder with a wall thickness of 16mm-24mm, before welding, it is directly welded without opening the groove, so welding is also likely to cause many pores after welding, which cannot be repaired; for the wall thickness of 8mm-14mm Before welding, the cylinder is directly welded without opening the groove, and the weld bead is not preheated before welding, so welding is likely to cause many pores after welding, which cannot be repaired; the above three methods need to use X-ray flaw detection after welding, and the flaw detection The final re...

Claims

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Application Information

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IPC IPC(8): B23K9/00B23K9/235
CPCB23K9/013B23K9/18B23K9/235
Inventor 张冠男
Owner 哈尔滨红光锅炉总厂有限责任公司
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