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A kind of mag welding circumferential welding method

A technology of circumferential welding and welded joints, which is applied in the field of MAG welding circumferential welding, can solve the problems such as difficult connection of joints, difficulty in removal, and hidden dangers of weld quality, so as to prolong arc starting operation time, ensure structural uniformity, and good fusion Effect

Active Publication Date: 2021-01-26
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the arcing point is too thick, it will make it more difficult to connect the joints, resulting in a large number of defects at this position
When the weld consists of accumulated multiple passes, the defect at the arc starting point will be covered by the subsequent weld, and a defect that is not easy to remove is formed at the initial position of the weld. When the welding operation is completed, this defect is Can not be removed through post-processing, causing inevitable hidden dangers to weld quality

Method used

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  • A kind of mag welding circumferential welding method
  • A kind of mag welding circumferential welding method
  • A kind of mag welding circumferential welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Such as Figure 1 to Figure 4 As shown, the MAG welding circumferential welding method described in this embodiment comprises the following steps:

[0055] S1. Determine the relative positions of the first piece 1 and the second piece 2 to be welded;

[0056] S2. Arranging arc start and stop weldment at welding joint 4;

[0057] S3. After the arc start and stop weldment is cooled to a certain temperature, the two ends are processed to form the start and stop welding section 3; the two ends of the start and stop welding section 3 are respectively the arc start end 31 and the arc stop end 32 ;

[0058] S4. Start the arc at the arc starting end 31, and move the welding torch along the circumferentially closed welding joint 4 to form a weld bead;

[0059] S5. When the formed weld bead reaches the arc-ending end 32, the arc is stopped at the arc-ending end. The profile of the welded joint is circular (annular). Preferably, the arc-starting end and the arc-ending end have ...

Embodiment 2

[0065] Such as Figure 1 to Figure 4 As shown, the difference between the MAG welding circumferential welding method described in this embodiment and the above-mentioned embodiments is that in the welding operation in this embodiment, before implementing step S4, heat treatment is performed on the arc starting end 31, so that the arc starting end 31 When the temperature rises to a certain level, the operation of forming the weld bead can increase the wettability between the starting point of the weld bead and the arc starting end, and avoid the formation of defects between the two.

[0066] Further, in the welding operation in this embodiment, when the welding bead is formed, the torch is evenly moved until the trajectory of the welding bead covers the circumference of the welding joint position, and then the welding torch is closed at the arc-ending end 32 to form a complete circular contour .

[0067] Further, the welding operation step S5 in this embodiment also includes s...

Embodiment 3

[0071] Such as Figure 1 to Figure 4 As shown, the difference between the MAG welding circumferential welding method described in this embodiment and the above-mentioned embodiment is that: after the step S5, it also includes steps:

[0072] S7. Perform end treatment on the end formed by the arc closing operation in step S5, and use it as the arc starting end, repeat steps S4 to S6 to form at least two welding passes until the welding operation is completed; preferably, the end Methods of internal treatment include sanding.

[0073] In the welding operation method in this embodiment, the ends of the arc start and end welding section 3 are processed, so that the arc start point and the arc end point between the end and the weld bead can be well transitioned, and the microscopic structure can be guaranteed. Uniformity can also ensure macroscopic structural uniformity, reducing or even avoiding subsequent surface treatment operations.

[0074] Further, the end processing in thi...

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Abstract

The invention discloses a MAG welding circumferential welding method. An arc starting and closing section is arranged at the position of the welding joint, so as to reduce the defects of the arc starting point of the welding operation and enable the circumferential welding to form a uniform ring structure extending along the weld seam , significantly reducing the number of welded joints.

Description

technical field [0001] The invention belongs to the field of welding process control, and in particular relates to a MAG welding circumferential welding method. Background technique [0002] In the prior art, for workpieces to be welded with large circumferential dimensions at the welding joint, a circumferential weld bead around the weld joint is often used, so that the weld bead is connected end to end to form a ring. When the size of the welded joint is relatively large, or the corresponding position of the welded joint is provided with a bevel, multiple welding operations are required to form multiple welded joints. When there are many polygons to be welded, and the positions corresponding to the welded joints are also polygonal, a welding operation must be performed on each side, so that the number of welded joints will be more. During the actual welding operation, the arc starting point of each layer of weld bead has a certain thickness, generally 3-4mm, and some part...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/173B23K9/028B23K9/235
CPCB23K9/028B23K9/173B23K9/235
Inventor 吕光宙孙正夏郭文俊崔传学韩儒金
Owner CRRC QINGDAO SIFANG CO LTD
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