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

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Problems solved by technology

[0003] The present invention provides a boiler drum welding method in order to solve the problem t

Method used

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  • Boiler barrel welding method
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  • Boiler barrel welding method

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Experimental program
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Example Embodiment

[0012] Specific implementation mode 1: Combination figure 1 To explain this embodiment, this embodiment is a welding method of the first tube section, which is realized by the following steps: Step 1. The plate thickness δ of the first tube section 1 to be welded is 26mm-28mm, and the first section is welded. The inner and outer sides of the tube section 1 are grooved, the inner groove is 30°, the outer groove is 45°, the first blunt side b between the inner groove and the outer groove is 4mm~5mm, the inner groove is Both sides and both sides of the outer groove are polished and cleaned; Step 2. Roll the first welded barrel section 1, and the butt joints must not have gaps; Step 3. Use the first welded barrel section 1 to be rolled Gas shielded welding is performed on the outer side of the spot welding, and the length of the spot welding is 20mm-40mm; Step 4. The inner side of the first welded barrel section 1 is fully welded by submerged arc automatic welding, the diameter of t...

Example Embodiment

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

Example Embodiment

[0014] Specific implementation mode three: combination figure 1 To describe this embodiment, the spot welding length in step 3 of this embodiment is 30 mm. The other steps are the same as the first or second embodiment.

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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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