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Automatic welding method for small-diameter thin-wall multi-layer pipe

A multi-layer pipe, automatic welding technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of ablation of the main body of thin-walled pipes, scrapped parts in batches, insufficient penetration of solder, etc., to shorten production. The effect of cycle, small heat affected zone and stable product quality

Inactive Publication Date: 2012-05-16
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Manual brazing temperature is not easy to control, resulting in insufficient solder penetration; manual argon arc welding is easy to cause ablation of the thin-walled catheter body
The qualified rate of welding is only about 20%, which leads to the scrapping of parts in batches, and it is urgent to improve the qualified rate of product welding

Method used

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  • Automatic welding method for small-diameter thin-wall multi-layer pipe
  • Automatic welding method for small-diameter thin-wall multi-layer pipe

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Experimental program
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Effect test

Embodiment 1

[0022] This embodiment provides an automatic welding method for small-diameter thin-walled multilayer pipes, which is characterized in that: the automatic welding method for small-diameter thin-walled multilayer pipes is automatic hanging arc welding, that is, tungsten-level inert gas shielded welding, which is Using pure tungsten or activated tungsten as the electrode, arc welding is carried out under the protection of inert gas. An arc is generated between the end of the tungsten pole and the base material to be welded to weld the base material. The inner cavity of the part is protected by argon gas during welding;

[0023] It has many adjustable parameters, can accurately control the welding heat input and the shape and size of the molten pool, the heat-affected zone is small, the welding quality is reliable, and the defects are controllable;

[0024] The effective welding thickness is 0.7 mm, and the effective welding length is 12 mm. By dividing the entire welding process ...

Embodiment 2

[0035] This embodiment provides an automatic welding method for small-diameter thin-walled multilayer pipes, which is characterized in that: the automatic welding method for small-diameter thin-walled multilayer pipes is automatic hanging arc welding, that is, tungsten inert gas shielded welding, which is Using pure tungsten or activated tungsten as the electrode, arc welding is carried out under the protection of inert gas. An arc is generated between the end of the tungsten pole and the base material to be welded to weld the base material. The inner cavity of the part is protected by argon gas during welding;

[0036] It has many adjustable parameters, can accurately control the welding heat input and the shape and size of the molten pool, the heat-affected zone is small, the welding quality is reliable, and the defects are controllable;

[0037] The effective welding thickness is 1.1 mm, and the effective welding length is 13 mm. By dividing the entire welding process into s...

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Abstract

The invention relates to an automatic welding method for a small-diameter thin-wall multi-layer pipe, which adopts automatic suspended arc welding (i.e. inert-gas arc welding). The automatic welding method comprises the following steps: by using pure tungsten or activated tungsten as an electrode, carrying out arc welding under the protection of inert gas; generating an arc between the end part of the tungsten electrode and a welded base material so as to carry out welding; and introducing argon gas for protection into the cavities of parts in the welding process, wherein the effective welding thickness is 0.7-1.1 millimeters; the effective welding length is 12-14 millimeters; the welding quality of the whole process can be ensured by dividing the whole welding process and adjusting the relevant parameter value of each section; the welding parameters are as follows: a positive rotation mode is adopted; the striking current is 9-11A, and the arc extinguishing current is 5-7A; the climbing time is 0.4-0.6 second, and the descending time is 2-3 seconds; and the welding process is divided into five sections. The invention has the following advantages: the automatic suspended arc welding is used instead of manual brazing; the X-ray inspection after welding shows that the welding qualified rate of pipe assemblies is increased to 90%; and the product quality is stabilized, the production cycle is shortened, and the processing cost is lowered.

Description

technical field [0001] The invention relates to the technical field of engine conduit component welding, and in particular provides an automatic welding method for small-diameter thin-walled multilayer pipes. Background technique [0002] At present, manual brazing and manual argon arc welding are mainly used for welding engine conduit components. Manual brazing temperature is not easy to control, resulting in insufficient solder penetration; manual argon arc welding is likely to cause ablation of the main body of the thin-walled catheter. The qualified rate of welding is only about 20%, which leads to the scrapping of parts in batches, and it is urgent to improve the qualified rate of product welding. Contents of the invention [0003] The purpose of the present invention is to stabilize product quality and improve production efficiency, and especially provides an automatic welding method for small-diameter thin-walled multilayer pipes. [0004] The invention provides a...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/095
Inventor 訾雁高浚陈文伟
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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