Ultra-narrow gap welding device and method for pipe fitting welding

A welding device and pipe fitting welding technology, applied in welding equipment, welding accessories, arc welding equipment, etc., can solve problems such as bed defects, and achieve the effects of simple installation, prevention of arc climbing, and low heat input

Active Publication Date: 2020-10-30
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above problems, the present invention provides an ultra-narrow gap welding device and method for welding pipe fittings, which solves the problem of defects in the welding pool

Method used

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  • Ultra-narrow gap welding device and method for pipe fitting welding
  • Ultra-narrow gap welding device and method for pipe fitting welding
  • Ultra-narrow gap welding device and method for pipe fitting welding

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Embodiment 1

[0048] refer to Figure 1 to Figure 4 , an ultra-narrow gap welding device for welding pipe fittings. The welding device includes a welding mechanism, a rotating mechanism and a positioning mechanism; the welding mechanism rotates around the positioning mechanism through the rotating mechanism, and the positioning mechanism is arranged inside the pipe to be welded. The positioning mechanism is mainly The position of the welding mechanism in the groove is positioned, and the rotating mechanism is connected to the positioning mechanism in rotation;

[0049] The welding mechanism comprises a motor 14, a first sprocket wheel 15, a chain 16, a support plate 18, a positioning wheel 19, a support frame 23, and a plate welding torch 11; The plate 25 is fixedly installed on the support frame 23, and the outer surface of the support plate 18 is evenly equipped with at least three positioning wheels 19 that match the pipe fittings to be welded, and a gap is provided between two adjacent ...

Embodiment 2

[0066]The present invention is mainly used for the welding of large pipe fittings and valve bodies. The groove gap used is between 4.5-5mm. Generally, the groove is assembled into an I-shaped groove of about 1.8°, and the thickness of each welding is 3-4mm. Left and right, in order to be able to weld in a narrow gap, the welding torch is a plate welding torch with a thickness of 3mm, and the flux is used to bring a restricted arc. The thickness is about 0.7mm, and its main components are limestone and fluorite. According to the composition of the weldment and welding quality It is required to properly add an appropriate amount of alloying elements, and the structure of the flux tape is a glass fiber net bonded with a flux sheet.

[0067] An ultra-narrow gap welding method for pipe fittings, comprising the steps of:

[0068] Before welding, derust and degrease the weldment, and clean the surface of the welding part of the pipe to be welded;

[0069] In order to effectively pre...

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Abstract

The invention discloses an ultra-narrow gap welding device and method for pipe fitting welding, and relates to the technical field of welding. The ultra-narrow gap welding device for pipe fitting welding comprises a welding mechanism, a rotating mechanism and a positioning mechanism; and the welding mechanism rotates around the positioning mechanism through the rotating mechanism, the positioningmechanism is arranged inside a to-be-welded pipe fitting, and the rotating mechanism is rotationally connected with the positioning mechanism. Transverse welding can be carried out in a groove with the small gap width, due to the fact that the groove width is small, the welding line energy is low, the heat input amount in the welding process is low, growth of a molten pool is effectively inhibited, collapse of the molten pool is prevented, the collapse defect of the molten pool can be effectively overcome, and the welding production efficiency can be improved; and the device is convenient to operate and moves easily, and the problem that large equipment is difficult to operate and high in operation technical requirement in field welding is solved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to an ultra-narrow gap welding device and method for welding pipe fittings, which are suitable for on-site welding and defect repair of cast steel pipe fittings. Background technique [0002] At present, in the production of steam valves for power plant boilers, it is necessary to weld the cast valve body and the connecting pipe, the wall thickness of the connecting pipe is 60-120mm, and the inner diameter is 400-800mm. The existing welding method in the project is manual arc welding. The connecting pipe is placed vertically on the valve body that is inconvenient to turn over, a V-shaped groove is made, and the entire welding joint is completed by using the electrode arc all-position welding process. The welding quality is difficult to control. And welding production efficiency is low. [0003] The groove of the pipe fittings is assembled in a horizontal and transverse position, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/133B23K9/32
CPCB23K9/16B23K9/133B23K9/32
Inventor 朱亮董敏张爱华张兴有蒋小霞韩潇橦
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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