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Automatic end socket welding method of automatic welding device based on large-curved-surface end socket welding

An automatic welding and automatic welding technology, which is applied in the direction of auxiliary devices, welding equipment, welding equipment, etc., can solve the problems of cumbersome automatic welding for economic benefits, high labor intensity of workers, and unsuitability for automatic welding, etc., so as to reduce labor intensity of workers, tooling Simple, reliable, and easy-to-operate effects

Inactive Publication Date: 2014-09-03
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited rotary stroke of the positioner, the automatic welding of the device is relatively cumbersome in terms of economic benefits, and the dimensional accuracy of the head after manufacture is ignored.
At present, when some enterprises manufacture the heads, they first assemble the melon petals or the melon petals and balls according to the manufacturing experience. After the assembled and fixed heads are spot-fixed, manual welding of the internal and external welds is performed. The labor intensity of the workers is high and the working environment Poor, low work efficiency
[0003] The applicant submitted a Chinese patent application titled "A General Purpose Tailored Welding Tooling Deformation Device and Method for Large Curved Heads of Pressure Vessels", which proposed a method for preventing deformation of tailor welding tooling, but it did not Not suitable for automatic welding requirements

Method used

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  • Automatic end socket welding method of automatic welding device based on large-curved-surface end socket welding
  • Automatic end socket welding method of automatic welding device based on large-curved-surface end socket welding
  • Automatic end socket welding method of automatic welding device based on large-curved-surface end socket welding

Examples

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no. 1 example

[0021] The first embodiment: the automatic welding method of the hemispherical head. When in use, the device is placed in the working workshop for the manufacture of the upper head of the dealkylation tower of the 400,000 tons / year catalytic oil slurry supercritical extraction device. The upper head has a hemispherical head with a thickness of δ=85min and a radius of R=2100mm. The material used is Q345R. This material is prone to hardening tendency in the heat-affected zone when welding, and it is easy to form a quenched structure-martensite, making it close to The hardness of the seam area increases and the plasticity decreases, which easily leads to cracks after welding. Therefore, ensuring a reasonable tooling and welding process is the key to welding manufacturing. When the head is manufactured, the eight melon petal heads are placed on the device one by one, and then the ball is placed on the top of all the melon petals to be assembled for clamping. After the clamping is c...

no. 2 example

[0022] The second embodiment: the automatic welding method of the semi-ellipsoidal head. The semi-ellipsoidal head is an important part of the dearomatization tower of the 400,000 tons / year catalytic slurry supercritical extraction device. The upper head of the dearomatization tower is an ellipsoidal head, and the welding curve is more complicated than that of a hemispherical head during manufacture. When in use, the device is placed in the manufacturing of the head of the dearomatization tower of the working plant. The thickness of the upper head is δ=50(48)mm, the long axis radius R=2500mm, the short axis radius r=1500mm, and the semi-ellipsoidal head, the bottom half section is circular with radius r=2000mm. The material used is Q345R. When the head is manufactured, 6 pieces of melon petal heads are placed on the device one by one, and then the oval ball is placed on the top of all melon petals for assembly, and the dimensions are clamped and positioned according to the draw...

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Abstract

The invention discloses an automatic end socket welding method of an automatic welding device based on large-curved-surface end socket welding. The device comprises a support base plate, a ball screw, a group of rolling bearings, an external locating block, an internal locating block, a rotary handle, a calibrated scale, a welding positioner, and a welding head realizing automatic welding, and the end socket comprises a plurality of claw end sockets and a segment. The method is characterized by comprising following steps of end socket fixation, welding of external welding line, welding of internal welding line, and annealing heat treatment. The method can be used for automatic welding of large end sockets of various sizes, thus lowering labor intensity of workers, shortening the manufacturing cycle of products, and lowering production cost.

Description

Technical field [0001] The invention relates to an automatic head welding method based on a large-scale curved head tailor welding automatic welding device, and belongs to the technical field of head manufacturing. Background technique [0002] In the manufacture of large-scale pressure vessels, the manufacture of the head is limited by materials, pressing equipment and molds, and it is difficult to form a whole by pressing, and casting is extremely easy to form defects such as shrinkage holes and cracks. The most commonly used method is to weld multi-petal melon petals or a combination of a larger ball and multiple arc-shaped petals. The melon petals, ball gaps and arc-shaped petals are first cold-worked and stamped, then beveled, and finally assembled on the welded carcass. Since the shape of the head is mostly hemispherical ellipsoid arc structure, it is difficult to realize automatic submerged arc welding. In addition, the welding of the heads of most pressure vessel manufa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02B23K37/047B23K37/04
CPCB23K31/02B23K37/047B23K2101/12
Inventor 李晓泉闫业良邹华
Owner NANJING INST OF TECH
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