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The bottoming method of MIG welding in pipeline welding

A melting electrode and pipeline technology, used in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of construction cost investment and profit return not proportional, large welding machine cost investment, equipment use limitations and other problems, to improve the quality of flaw detection efficiency and construction efficiency, improve welding production efficiency, and reduce labor costs

Active Publication Date: 2020-11-10
PANGANG GRP ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the melting electrode MIG welding process has been widely used in oil and natural gas pipelines at home and abroad, but the cost of the welding machine itself is relatively large. The minimum price of a professional melting electrode MIG welding machine is more than 50,000 yuan, and some equipment is semi-automatic. One piece of welding equipment is as high as hundreds of thousands, and the equipment is more complicated than the general melting electrode equipment. It is not directly proportional to the construction cost investment and profit return in general industries, and the use of this equipment is also limited in places where the construction site is relatively complicated.

Method used

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  • The bottoming method of MIG welding in pipeline welding
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  • The bottoming method of MIG welding in pipeline welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Welding base material: the material of the pipe is 20, the outer diameter of the pipe is 273mm, and the wall thickness is 8mm; the horizontal fixed position welding is used between the two pipes.

[0035] Welding equipment and materials: The welding machine adopts conventional NBC-350 carbon dioxide gas shielded welding machine, and the shielding gas adopts a mixture of argon and carbon dioxide. Calculated according to the volume percentage, the proportion of argon is 95%, and that of carbon dioxide is 5%. ; Welding wire adopts ER49-1Ф1.2mm welding wire.

[0036] Groove setting: adopt V-shaped groove, the root gap is 4mm, and the single-side groove angle is 30°.

[0037] Working parameters of welding equipment: welding current is 150A~180A, voltage is 14V~17V.

[0038] Welding operation: In the circumferential direction of the weld, mark the lowest point as M and the highest point as N, take a point on the weld on one side of the straight line MN and mark it as P, and ...

Embodiment 2

[0044] Welding base material: the material of the pipe is 20, the outer diameter of the pipe is 600mm, and the wall thickness is 6mm; the horizontal fixed position welding is used between the two pipes.

[0045] Welding equipment and materials: The welding machine adopts conventional NBC-350 carbon dioxide gas shielded welding machine, and the shielding gas adopts a mixture of argon and carbon dioxide. Calculated according to the volume percentage, the proportion of argon is 95%, and that of carbon dioxide is 5%. ; Welding wire adopts ER49-1Ф1.2mm welding wire.

[0046] Bevel setting: V-shaped bevel is adopted, the root gap is 4mm, and the bevel angle on one side is 35°.

[0047] Working parameters of welding equipment: welding current is 150A~180A, voltage is 14V~17V.

[0048] Welding operation: In the circumferential direction of the weld, mark the lowest point as M and the highest point as N, take a point on the weld on one side of the straight line MN and mark it as P, an...

Embodiment 3

[0054] Welding base material: the material of the pipe is 20, the outer diameter of the pipe is 325mm, and the wall thickness is 6mm; the vertical fixed position welding is used between the two pipes.

[0055] Welding equipment and materials: The welding machine adopts conventional NBC-350 carbon dioxide gas shielded welding machine, and the shielding gas adopts a mixture of argon and carbon dioxide. Calculated according to the volume percentage, the proportion of argon is 95%, and that of carbon dioxide is 5%. ; Welding wire adopts ER49-1Ф1.2mm welding wire.

[0056] Groove setting: adopt V-shaped groove, the root gap is 4mm, and the single-side groove angle is 30°.

[0057] Working parameters of welding equipment: welding current is 120A~130A, voltage is 13V~14V.

[0058] Welding operation: The arc starting position is close to the edge of the upper groove, and welding is carried out in an oblique circle from top to bottom, such as Figure 8 As shown, the trajectory of the...

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Abstract

The invention relates to a priming method for melting pole MIG welding in pipeline welding and belongs to the technical field of pipeline welding. During welding, V-shaped welding grooves are oppositely formed in butt-joint end faces of two pipes to be welded respectively, the bottom gap of the V-shaped grooves is 3 mm to 5 mm, the angle of the groove on one side is 30 degrees to 35 degrees, semi-automatic melting pole MAG welding equipment is adopted as a welding machine for priming welding, and mixed gas of argon and carbon dioxide is adopted as protection gas and comprises, by volume, 95% of argon and 5% of carbon dioxide. The method adopts the common semi-automatic melting pole MAG welding equipment to achieve an MIG welding effect, the construction cost can be reduced, the construction efficiency is improved, and welding defects in conventional operation methods are avoided.

Description

technical field [0001] The invention relates to a bottoming method for MIG welding in pipeline welding, which belongs to the technical field of pipeline welding. Background technique [0002] The chemical industry has high requirements on the strength and compactness of pipelines and tanks, so it has strict requirements on the welding quality of pipelines, and the requirements for radiographic flaw detection of some pipelines reach the first grade. In the prior art, argon arc welding is used for one-sided welding and double-sided forming of the root pass, and manual welding is used for filling and covering welding. However, when welding large-diameter pipes, the lower half of the large pipe is almost in the position of overhead welding and climbing overhead welding, and the operation of argon arc welding must hold the welding torch in one hand and feed the welding wire in the other hand. The two hands must cooperate and coordinate to ensure Weld quality. Conventional argon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/173B23K9/00
CPCB23K9/0052B23K9/173
Inventor 梁恩荣王跃峰何耀飞鲁晓欣
Owner PANGANG GRP ENG TECH
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