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All-position MAG mechanical welding process and application of pipeline fixing port

A technology for pipe fixing and welding process, applied in the application, welding medium, welding equipment and other directions, can solve the problems of high construction cost, heavy maintenance workload, complex submerged arc welding equipment, etc., to improve welding quality and efficiency, welding High first pass rate, stable and reliable welding quality

Inactive Publication Date: 2020-09-18
SINOPEC TENTH CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: high requirements for welders' operation skills, and the welding quality of electrode arc welding depends to a certain extent on welders' operation skills
Its disadvantages are: during the welding process of submerged arc automatic welding, the welder cannot directly observe the change of the molten pool, and it is easy to produce offset and lack of fusion, and cannot adjust the process parameters in time. It is necessary to install a guide wire on one side of the welding torch before welding, so that The nozzle is always aimed at the center of the weld to ensure that the weld does not deviate
The submerged arc welding equipment is relatively complicated, and the maintenance workload is heavy. The welding of pipelines is limited to the flat welding position, and it is difficult to achieve welding in other positions.
[0006] The inventor has learned that when welding the secondary prefabricated welding joints and on-site fixed joints of the existing pipelines using the above method, they will encounter the shortcomings brought by the above welding method itself, and at the same time, affected by the welding process, the welding efficiency is low and the construction cost is low. High, unstable welding quality, prone to welding defects

Method used

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  • All-position MAG mechanical welding process and application of pipeline fixing port
  • All-position MAG mechanical welding process and application of pipeline fixing port

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, the present embodiment provides a kind of all-position MAG mobile welding welding process for the fixed opening of the pipeline, including the following steps:

[0028] Step 1, set the output welding pulse current and voltage values ​​on the welding power source;

[0029] Step 2, delivering the pulsed current and voltage to the solid welding wire;

[0030] Step 3, the solid cored wire sends the solid cored wire on the solid cored wire reel to the arc burning place through the wire feeding roller;

[0031] Step 4, the arc burns on the pipeline to form a weld;

[0032] Step 5, continue the welding of the next weld seam.

[0033] In step 2, the power supply voltage output by the welding power supply is 18-20V. In step 3, the groove of the welding part of the pipeline is a double V-shaped groove, and the groove angle is 56-80°. The welding material of the solid wire is suitable for the material of the pipe to be welded, and the diameter of th...

Embodiment 2

[0035] This embodiment provides an application of the all-position MAG motorized welding process of the fixed port of the pipeline in the welding of A106Gr.B pipelines. The specific welding steps are the same as those in Example 1, and the differences are as follows:

[0036] In step 1, the pulse current is 140-150A, and the voltage is 18-20V.

[0037] During the welding process, the welding current actually refers to the wire feeding speed. The size of the welding current depends on the speed of the wire feeding. If the welding current is too large, the line energy will burn the alloy components in the welding material too much, so that the weld Overall performance deteriorates. During the filling process of the hot solder layer, it is easy to penetrate the bottom weld seam, the weld seam will be oxidized, and the large splash will block the end of the contact tip, and the molten pool will become larger and the liquid metal will increase. The molten pool is difficult to contr...

Embodiment 3

[0054] This embodiment provides an application of the all-position MAG motorized welding process of the fixed port of the pipeline in the welding of heat-resistant steel 335-P11 and 335-P11 pipelines. The specific welding steps are the same as those in Example 1, and the differences are as follows:

[0055] In step 1, the pulse current is 130-140A, and the voltage is 18-20V.

[0056] During the welding process, the welding current actually refers to the wire feeding speed. The size of the welding current depends on the speed of the wire feeding. If the welding current is too large, the line energy will burn the alloy components in the welding material too much, so that the weld Overall performance deteriorates. During the filling process of the hot solder layer, it is easy to penetrate the bottom weld seam, the weld seam will be oxidized, and the large splash will block the end of the contact tip, and the molten pool will become larger and the liquid metal will increase. The m...

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Abstract

The invention relates to an all-position MAG mechanical welding process and application of a pipeline fixing port. The method comprises the following steps of: setting pulse current and voltage valuesfor outputting welding on a welding power supply; delivering pulse current and voltage to a solid-core welding wire; sending the solid-core welding wire on a solid-core welding wire disc to an electric arc combustion part through a wire feeding wheel; burning an electric arc on a pipeline to form a welding seam; and continuing to perform welding of a next welding seam.

Description

technical field [0001] The disclosure belongs to the field of welding technology, and in particular relates to a welding process and application of an all-position MAG motorized welding of a fixed opening of a pipeline. Background technique [0002] At present, welding methods such as tungsten argon arc welding, electrode arc welding, and submerged arc automatic welding are generally used for welding pipelines in the petrochemical industry. [0003] Argon tungsten arc welding is an inert gas shielded welding that uses pure tungsten or activated tungsten as the electrode, and uses argon as the gas. It is a type of gas shielded welding, and is usually called "TIG" welding. During the arc burning process, the electrode does not melt, so it is easy to maintain a constant arc length and the welding process is stable. Its main disadvantages are low welding efficiency, high cost, strict requirements for cleaning before welding, special arc ignition measures, strong ultraviolet ray...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K33/00B23K35/38B23K9/02B23K101/06
CPCB23K9/02B23K9/173B23K33/004B23K35/383B23K2101/06
Inventor 刘建国王银飞王鹏雁王健田文冲魏家斌
Owner SINOPEC TENTH CONSTR
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