Plasma circular seam welding hole shrinkage process method

A technology of plasma ring and process method, which is applied in the field of plasma ring seam welding hole closing technology, can solve the problems of incomplete penetration, burn-through, and poor forming of the small hole closing area of ​​plasma ring seam, and achieve high quality requirements and good application effect of effect

Active Publication Date: 2020-03-24
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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  • Plasma circular seam welding hole shrinkage process method
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  • Plasma circular seam welding hole shrinkage process method

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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) 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;

[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%;

...

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) 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;

[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...

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Abstract

The invention relates to a plasma circular seam welding hole shrinkage process method, and belongs to the technical field of plasma welding. The welding current, the ion airflow and the wire feeding speed of a plasma girth welding starting section, a welding section and an ending section are studied. A method of slowly reducing current at a constant speed and reducing heat input is adopted in thewelding section, the problems that in the existing current constant specification, after heat input of the tail section welding seam is accumulated, the welding seam joint is thick in structure and poor in appearance forming are effectively solved, and the appearance percent of pass of the welding seam reaches 100%. The circular seam ending section adopts a method that the welding current firstlyrises and then falls and the ion gas is firstly maintained and then falls so that the long-standing difficult problems of poor back surface forming and incomplete welding caused by high welding seam and incomplete fusion of the circular seam arcing joint are thoroughly solved. The X-ray flaw detection qualification rate and the front and back appearance qualification rate of the welding seam bothreach 100% and popularization and application are easy.

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 Applications(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
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