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A complete set of welding equipment and working method for automatic vertical welding of LNG storage tank 9% Ni steel

A 9% ni, automatic technology, applied in the direction of welding equipment, welding accessories, arc welding equipment, etc., can solve the problems of cable winding, welding torch rotation angle limited, inapplicability, etc., to achieve easy implementation, avoid poor weld quality, and weld high efficiency effect

Active Publication Date: 2019-05-07
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent document 201510255345.6 discloses an infinitely rotating welding torch. This patent is a rotating clamping device for a secondary protection welding torch, which rotates at a certain angle with the traditional secondary protection welding torch. The purpose is to solve the limited rotation angle of the welding torch when welding round seams. Cable entanglement issues when rotating, not suitable for narrow gap TIG welded sidewalls

Method used

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  • A complete set of welding equipment and working method for automatic vertical welding of LNG storage tank 9% Ni steel
  • A complete set of welding equipment and working method for automatic vertical welding of LNG storage tank 9% Ni steel
  • A complete set of welding equipment and working method for automatic vertical welding of LNG storage tank 9% Ni steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A complete set of welding equipment for automatic vertical welding of 9% Ni steel for LNG storage tanks, including a vacuum adsorption system, a welding trolley and a narrow gap rotary tungsten electrode welding torch; the vacuum adsorption system includes a wall-mounted suction plate, a vacuum pump, and the inner side of the wall-mounted suction plate There is a suction cup, the wall-mounted suction plate is suspended on the weldment, the suction cup is connected with the vacuum pump, the wall-mounted suction plate is connected with the welding trolley; Gap rotary tungsten welding torches are connected; narrow gap rotary tungsten welding torches include a gun body with a central rotating shaft, a conductive system and a motor control box, the motor control box is connected with one end of the central rotating shaft, and the other end of the central rotating shaft is set There is a tungsten pole, and one end of the tungsten pole is a non-centrosymmetric tip; the conducti...

Embodiment 2

[0055] A complete set of welding equipment for automatic vertical welding of 9% Ni steel for LNG storage tanks, its structure is as described in Embodiment 1, the difference is that the motor is located in the support block, the motor is connected with the gun body through the support block, and the support block is an electric Support blocks for woodworking. The supporting part around the motor is processed with bakelite to ensure the insulation between the motor and the central shaft and prevent high-frequency breakdown.

Embodiment 3

[0057] A complete set of welding equipment for automatic vertical welding of 9% Ni steel for LNG storage tanks. Its structure is as described in Example 1, the difference is that an inclined-plane boss is provided on the outside of the central axis, and an inclined-plane groove is provided on the conductive block, and the inclined-surface is convex. The table is in contact with the slope groove. Make the central shaft and the conductive block have a taper contact, and when the central shaft rotates, the two complete the conduction in the rotation. The taper can increase the conductive contact surface to ensure stable and good conductivity under high welding current. The angle between the slope of the slope boss and the radial plane of the central axis is 35°.

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Abstract

The invention relates to whole-set welding equipment for the automatic vertical welding of 9%-Ni steel for an LNG storage tank and a working method thereof and belongs to the technical field of welding. The whole-set welding equipment comprises a vacuum absorbing system, a welding trolley and a narrow-gap rotating tungsten-electrode welding gun, wherein the vacuum absorbing system comprises a wall-mounted absorbing plate, the inner side of the wall-mounted absorbing plate is provided with a sucker, the wall-mounted absorbing plate is suspended on a welding component, the sucker is connected with a vacuum pump, and the wall-mounted absorbing plate is connected with the welding trolley; the welding trolley comprises a trolley body and a control box, the control box is arranged on the trolley body, and the trolley body is connected with the narrow-gap rotating tungsten-electrode welding gun; the narrow-gap rotating tungsten-electrode welding gun comprises a gun body, a central rotating shaft, an electricity conducting system and a motor control box are arranged in the gun body, the motor control box is connected with one end of the central rotating shaft, the other end of the central rotating shaft is provided with a tungsten electrode, and one end of the tungsten electrode is a tip end which is not centrally symmetric; and the electricity conducting system is connected with the central rotating shaft, and the outer part of the gun body is provided with a wire conveying system and a gas supply system. The two sides of a narrow gap are periodically heated by electric arcs, and the fusion of the side wall is great.

Description

technical field [0001] The invention relates to the design and welding working method of a complete set of welding equipment for automatic vertical welding of 9% Ni steel for liquid natural gas storage tanks, and belongs to the field of welding technology. Background technique [0002] In recent years, with the rapid growth of liquefied natural gas consumption worldwide, the construction of liquefied natural gas (LNG) storage tanks can greatly reduce storage and transportation costs. huge demand. 9% Ni steel is considered to be the best material for manufacturing low temperature pressure vessels / storage tanks due to its excellent low temperature performance and welding performance. Using 9% Ni steel plate for welding in various positions is one of the key technologies. [0003] Due to the large welding workload of LNG storage tanks, various welding methods are usually used for the welding of 9% Ni steel. At present, the main welding methods for welding 9% Ni steel include ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167B23K9/32B23K101/12
CPCB23K9/167B23K9/32B23K2101/125
Inventor 贾传宝闫强强
Owner SHANDONG UNIV
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