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Automatically backing weld method of pipeline MAG

A welding method and automatic welding technology, applied in welding equipment, welding accessories, arc welding equipment, etc., can solve the problems that the welding process cannot achieve automatic bottoming, the requirements of workers' operating skills are high, and the labor intensity is high, and the desalination operation can be achieved. Skills and labor intensity, the effect of solving high technical requirements and improving welding efficiency

Inactive Publication Date: 2010-11-24
KUSN HUAHENG ENG TECH CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the certain ellipticity and uneven thickness of the pipe welding, it is easy to cause large misalignment and poor control of the pairing gap when manual spot welding is assembled.
Therefore, the current pipeline welding methods at home and abroad still use the traditional manual TIG (tungsten argon arc welding) backing, the traditional welding process of electrode welding, gas shielded welding or submerged arc welding, and the welding process of the traditional welding process cannot achieve automatic backing , so the program is complicated, the manual labor intensity is high, the operation skills of the workers are high, and it cannot adapt to the development of the welding process with an increasing degree of automation.

Method used

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  • Automatically backing weld method of pipeline MAG

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 20# steel Φ219.1×8.18 carbon steel pipe is used for automatic MAG bottom welding and filling cover welding with automatic welding equipment, and the operation is carried out according to the following steps: Working environment: 0℃~40℃

[0030] 1) Hardware preparation:

[0031] Adopt a set of automatic welding equipment that meets the following conditions:

[0032] 11) The high-performance requirements of the welding power supply, the input of the control line energy, and the high-performance digital pulse inverter power supply such as STT of Lincoln in the United States, ColdArc of EWM in Germany or CMT in Austria;

[0033] The arc control technology with low linear energy makes it possible for the automatic MAG bottoming welding process of the pipeline; precise control of the molten pool, less heat input, making the welding current smaller to about 50A, spatter-free welding, and continuous arc; and can achieve super power Arbitrary conversion of arc and pulse welding...

Embodiment 2

[0057] The carbon steel pipe of 20# steel Φ370×18 is used for automatic MAG bottom welding and filling cover welding with automatic welding equipment, and the welding process is the same as that of the first embodiment. Carry out X-ray flaw detection on the welded test piece: Level 1 is qualified.

Embodiment 3

[0059] The stainless steel 316LΦ119×16 pipeline is used for automatic MAG bottom welding and filling cover welding with automatic welding equipment, and the welding method and steps are the same as those in Example 1. The welding process parameters are as follows:

[0060] Groove form: V-shaped, 37.5° on one side, number of welding layers: 4 layers, one layer of bottom welding, three layers of filling welding, and one layer of cover.

[0061]Backing welding parameters:

[0062] Welding wire: Φ1.0, welding wire material: 316L; welding gas: Ar98%+CO22%; gas flow: 15-20L / min; welding speed: 100-200mm / min; welding current: 60A-150A; welding voltage: 18V- 23V; swing amplitude: 2~6mm; edge dwell time: 0.1~0.5s; torch angle: 30°~50°; gas flow at the back of the pipe: 20L / min. Welding degree: 365°.

[0063] Filling and covering parameters are (three layers):

[0064] Welding wire: Φ1.2, the wire material is selected according to the process requirements; welding gas: Ar98%+CO22%; ...

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Abstract

The invention discloses an automatically backing weld method of a pipeline MAG, which is characterized by comprising the following steps: 1) hardware preparation; 2) prewelding preparation; 3) regulation and storage of a welding process, i.e. welding process parameters are input on a control platform of a control system PLC, comprising automatically backing weld process parameters and coverpass parameters; and 4) equipment running for automatically welding. The automatically backing weld processing method of the pipeline MAG of the invention improves welding efficiency, ensures the repeatability of weld joint quality, greatly weakens the requirement of the operating skill and labor intensity of workers and solves high technical requirements of automatically bottoming and welding which can not be realized by using the traditional welding processing method.

Description

technical field [0001] The invention relates to a welding process method for automatic bottoming (or root welding) of pipelines, in particular to a MAG (melting electrode gas shielded welding) automatic bottoming welding process for carbon steel and stainless steel pipelines, belonging to the technical field of welding automatic control . Background technique [0002] Due to the certain ellipticity and uneven thickness of the pipe welding, it is easy to cause large misalignment and poor control of the pairing gap during manual spot welding assembly. Therefore, the current pipeline welding methods at home and abroad still use the traditional manual TIG (tungsten argon arc welding) backing, the traditional welding process of electrode welding, gas shielded welding or submerged arc welding, and the welding process of the traditional welding process cannot achieve automatic backing , so the program is complicated, the manual labor intensity is high, and the operation skills of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/235B23K9/32
Inventor 汪忠廖剑雄李正东常红坡
Owner KUSN HUAHENG ENG TECH CENT
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