Arc closing method for laser welding of superalloy

A technology of laser welding and high-temperature alloys, which is applied in the field of laser welding of alloys and laser welding of high-temperature alloys. It can solve the problems of dense arc-stop pores and arc craters, achieve excessively smooth welds, and ensure the internal quality and appearance of welds. Quality, the effect of ensuring the appearance quality of welds

Active Publication Date: 2016-06-08
BEIJING HANGXING MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention discloses an arc extinguishing method for laser welding of superalloys, aiming to provide a method that does not require a preset arc extinguishing plate, does not need to dig out and repair welding after welding, and can eliminate welding arc extinguishing. The arc closing method of laser welding with pores overcomes the defects of dense arc closing pores and arc craters that are easy to occur during laser welding of superalloys, and obtains good internal quality and appearance quality of welds

Method used

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  • Arc closing method for laser welding of superalloy
  • Arc closing method for laser welding of superalloy
  • Arc closing method for laser welding of superalloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Butt welding of 2mm thick plate of GH4169 superalloy material

[0043] Butt welding of GH4169 superalloy with a welded joint thickness of 2mm. During laser welding, the welding power P 焊 It is 1700W, the shielding gas is argon, the side blowing gas flow L is 8L / min, the back shielding gas flow L is 4L / min, the crater speed v is 1100mm / min, the crater pulse period is 20ms, and the crater welding length is 10mm; According to the formula, the number of arcing pulses is n=28; enter the arcing stage;

[0044] In the crater section 1, the laser scanning direction is forward, after 28 crater pulses, the output power of the crater welding laser attenuates from 1700W to the base value power of 50W within 560ms;

[0045] Entering the crater section 2, the laser scanning direction is reversed, and after 28 crater pulses, the output power of the crater welding laser oscillates from 1700W to a base value of 875W within 560ms;

[0046] Entering the arc chopping section ...

Embodiment 2

[0049] Example 2: Butt welding of 3mm thick plate of Inconel601 superalloy material

[0050] Butt welding of GH4169 superalloy with a welded joint thickness of 2mm. During laser welding, the welding power P 焊 is 2300W, the shielding gas is argon, the side blowing gas flow L is 8L / min, the back shielding gas flow L is 5L / min, the crater speed v is 900mm / min, the crater pulse period is 10ms, and the crater length is 10mm; according to Formula, the number of arcing pulses n=67, enter the arcing stage;

[0051] In the crater section 1, the laser scanning direction is forward, after 67 crater pulses, the output power of the crater welding laser attenuates from 2300W to the base value power of 80W within 670ms;

[0052] Entering the crater section 2, the laser scanning direction is reversed. After 67 crater pulses, the output power of the crater welding laser oscillates from 2300W to a base value of 1190W within 670ms;

[0053] Entering the arc chopping section 3, the laser scann...

Embodiment 3

[0056] Example 3: Butt welding of 5mm thick plate of GH4169 superalloy material

[0057] Butt welding of GH4169 superalloy with a welded joint thickness of 5mm. During laser welding, the welding power P 焊 is 3300W, the shielding gas is argon, the side blowing gas flow L is 10L / min, the back shielding gas flow L is 8L / min, the crater speed v is 700mm / min, the crater pulse period is 20ms, and the crater length is 10mm; according to Formula, the number of arcing pulses n=43, enter the arcing stage;

[0058] In the crater section 1, the laser scanning direction is forward, after 43 crater pulses, the output power of the crater welding laser attenuates from 3300W to the base value power of 100W within 860ms;

[0059] Entering the crater section 2, the laser scanning direction is reversed, and after 43 crater pulses, the output power of the crater welding laser oscillates from 3300W to a base value of 1700W within 860ms;

[0060] Entering the arc chopping section 3, the laser sca...

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Abstract

The invention discloses an arc ending method for high-temperature alloy laser welding. An arc ending process of a high-temperature alloy laser weld includes three ending phases, namely first, second and third ending phases; the ending phases employ scanning directions: the first ending phase employs a regular direction, the second ending phase employs a reverse direction, and the third ending phase employs the regular direction; the ending phases successively operate to produce reciprocated laser scanning actions, and a bath at the welding arc end position is repeatedly scanned. During arc ending, laser output power waveforms of the ending phases are continuously attenuating triangular waves; laser output power attenuates into basic value in ending pulse. The method has the advantages that presence time of the ending bath is appropriately prolonged, gas in the bath is fully spilled, ending dense pores are avoided, and welding arc pits are downsized; on the premise of not using ending plates, the defects such as ending dense pores and arc pits in high-temperature alloy laser welding are avoided; the method is mainly applied to the field of laser welding.

Description

technical field [0001] The invention relates to an alloy laser welding method, in particular to an arc ending method for high temperature alloy laser welding, and belongs to the technical field of laser welding. Background technique [0002] With the development of aerospace technology, superalloy materials are more and more used in the above fields due to their excellent high temperature properties. With the continuous improvement of product performance, the appearance of superalloy structural parts has become more and more complex, especially superalloys are often used in parts with harsh service environments, and the requirements for the internal quality and appearance of welded structures are also getting higher and higher. Therefore, it is necessary to strictly control the welding method and welding process of superalloys. Laser welding has the advantages of small heat input, concentrated welding energy, large aspect ratio of weld seam, narrow heat-affected zone, small...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/095B23K9/16
CPCB23K26/123B23K26/24B23K26/32B23K2103/08
Inventor 步贤政李宏伟陈久友梁继哲汪永阳刘洋
Owner BEIJING HANGXING MACHINERY MFG CO LTD
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