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A kind of hole closing process method of plasma circular seam welding

A technology of plasma ring and process method, which is applied in the field of plasma ring seam welding hole closing technology, and can solve problems such as burn-through, incomplete penetration of the small hole end area of ​​plasma ring seam, and poor forming

Active Publication Date: 2021-09-14
云南昆船机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the deficiencies in the prior art, and provide a plasma circular seam welding shrinkage process method, which solves the Welding defects such as incomplete penetration, porosity, burn-through, and poor forming in the small hole end area of ​​the plasma circular seam can ensure the quality requirements of high-quality welded joints

Method used

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  • A kind of hole closing process method of plasma circular seam welding
  • A kind of hole closing process method of plasma circular seam welding
  • A kind of hole closing process method of plasma circular seam welding

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Experimental program
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Effect test

Embodiment 1

[0029] A method for closing holes in plasma circular seam welding, comprising the steps of:

[0030] Step (1), the starting section of the circular seam:

[0031] (1.1) The protective gas is supplied for 5 seconds in advance.

[0032] (1.2) The welding current, ion gas, and weldment rotation start simultaneously, the welding current and ion gas rise, the weldment is perforated, the molten pool forms a small hole effect, and wire feeding starts;

[0033] (1.3) The welding current, ion gas, and wire feeding speed continue to increase until they reach the normal welding current of 100A, ion air flow of 0.5 scfh, and wire feeding speed of 800mm / min, and start normal welding and enter the welding section;

[0034] Step (2), circular seam welding section:

[0035] (2.1) The welding current in the normal welding section tends to decrease slowly and at a constant speed, and the total current drop from the beginning of welding to the end of the circular seam welding section is 5%;

...

Embodiment 2

[0043] A method for closing holes in plasma circular seam welding, comprising the steps of:

[0044] Step (1), the starting section of the circular seam:

[0045] (1.1) The protective gas is supplied for 10 seconds in advance.

[0046] (1.2) Welding current, ion gas and weldment rotation start at the same time, welding current and ion gas rise, the weldment is perforated, the molten pool forms a small hole effect, and wire feeding starts;

[0047] (1.3) The welding current, ion gas, and wire feeding speed continue to increase until they reach the normal welding current of 350A, ion air flow of 2.8scfh, and wire feeding speed of 2800mm / min. Normal welding starts and enters the welding section;

[0048] Step (2), circular seam welding section:

[0049] (2.1) The welding current in the normal welding section tends to decrease slowly and at a constant speed, and the total current drop from the beginning of welding to the end of the circular seam welding section is 30%;

[0050]...

Embodiment 3

[0057] A method for closing holes in plasma circular seam welding, comprising the steps of:

[0058] Step (1), the starting section of the circular seam:

[0059] (1.1) The protective gas is supplied for 8 seconds in advance.

[0060] (1.2) Welding current, ion gas and weldment rotation start at the same time, welding current and ion gas rise, the weldment is perforated, the molten pool forms a small hole effect, and wire feeding starts;

[0061] (1.3) Welding current, ion gas, and wire feeding speed continue to increase until they reach the normal welding current of 200A, ion air flow of 1 scfh, and wire feeding speed of 1500mm / min. Normal welding starts and enters the welding section;

[0062] Step (2), circular seam welding section:

[0063] (2.1) The welding current in the normal welding section tends to decrease slowly and at a constant speed, and the total current drop from the beginning of welding to the end of the circular seam welding section is 15%;

[0064] (2.2)...

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Abstract

The invention relates to a hole closing process method for plasma circular seam welding, which belongs to the technical field of plasma welding. The invention studies the welding current, ion air flow and wire feeding speed of the initial section, welding section and ending section of plasma circular seam welding. Solve the problem that the welding seam joint structure is thick and the appearance is poor due to the accumulation of heat input in the final section of the welding seam in the current constant current specification, and the qualified rate of the appearance of the welding seam is 100%; The method of raising first and then lowering, maintaining the ion gas first and then lowering, completely solves the long-standing problem of poor formation and incomplete penetration of the back side due to the high weld seam and impermeable penetration of the arc starting joint of the circular seam. The pass rate of weld X-ray flaw detection and the pass rate of front and back appearance are both up to 100%, which is easy to popularize and apply.

Description

technical field [0001] The invention belongs to the technical field of plasma welding, and in particular relates to a plasma circular seam welding hole closing process method. Background technique [0002] Plasma welding is one of the three high-energy beam welding methods together with laser welding and electron beam welding. It is widely used in various industrial productions due to its high weld quality, high efficiency, small welding deformation and high technology maturity. . Plasma welding methods usually use the "small hole method" welding method for bottom welding or one-shot penetration forming process to ensure the back of the weld is formed. The welding defect in the end area of ​​the weld seam can be removed by means of "leading by the side of the hole" or drawing out the arc receiving plate, while the circular seam welding can only close the small hole by the hole closing process. The hole closing process generally uses the method of decreasing current and pla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K10/02
CPCB23K10/02
Inventor 李延杰林全福翟鹏飞李光枚杨凤娟张波
Owner 云南昆船机械制造有限公司