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Pulse double-beam laser welding method

A laser welding, double beam technology, applied in laser welding equipment, welding equipment, welding equipment and other directions, can solve the problems of small hole type porosity, achieve high-quality welding, control welding deformation, reduce the effect of porosity tendency

Inactive Publication Date: 2021-04-16
BEIJING HANGXING MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, whether it is high-power laser welding of thick plates or low-power laser welding of thin plates (the penetration depth is between 1.0mm and 3mm, and the maximum laser power is about 2kW), as long as the small holes do not penetrate the workpiece, for example, only relying on small holes When the bottom molten pool penetrates the workpiece, there will be serious problems of small hole type pores

Method used

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  • Pulse double-beam laser welding method

Examples

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specific example 1

[0048] Specific example 1: adopt the pulsed double-beam laser welding method provided by the present invention to carry out square-wave pulsed double-beam laser welding of 302 stainless steel. The combination of stainless steel plate thickness is 0.8mm+1mm, and the joint method is a nail-shaped joint. The specific welding process is as follows:

[0049] Grind the surface of the 302 stainless steel workpiece to be welded until the metal color of the body is exposed, and then clean the welding surface with absolute ethanol; assemble the workpiece to be welded, clamp and fix the stainless steel plate with clamps, and control the gap between the T-shaped joints to be welded at 0.1 within mm. Square wave pulse laser is used for positioning welding of the welding head, the length of positioning welding is 10mm-20mm, and the spacing of positioning welding is 50mm-200mm. Formal welding after tack welding, laser welding spot form is double beam, peak power is 1000W, base value power is...

specific example 2

[0050] Concrete example two, adopt the pulse double-beam laser welding method of the present invention, carry out 302 stainless steel square-wave pulse double-beam laser welding, the thickness of stainless steel plate is 1mm, joint mode is butt joint, specific welding process is as follows:

[0051] Grind the surface of the 302 stainless steel workpiece to be welded until the metal color of the body is exposed, then clean the welding surface with anhydrous ethanol, assemble the workpiece to be welded, the assembly gap is within 0.1mm, and the wrong side is within 0.1mm. The board is clamped firmly. Square wave pulse laser is used for positioning welding of the welding head, the length of positioning welding is 10mm-20mm, and the spacing of positioning welding is 50mm-200mm. Formal welding after tack welding, laser welding spot form is double beam, peak power is 1000W, base value power is 500W, pulse width is 20m, pulse frequency is 25Hz, welding speed is 1000mm / min, double bea...

specific Embodiment 3

[0052] Specific embodiment three, adopt the pulse double-beam laser welding method of the present invention, carry out square-wave pulse double-beam laser welding of 302 stainless steel T-shaped joints, the thickness combination of stainless steel plates is 1mm+2mm, the joint mode is T-shaped joints, and intermittent welding is adopted The length of each weld is 20mm, the interval between two adjacent penetration welds is 10mm to 20mm, and the penetration welds at both ends are close to the ends of the overlapping sections. Grind the surface of the stainless steel workpiece to be welded until the metal color of the body is exposed, and then clean the welding surface with absolute ethanol. Assemble the workpiece to be welded, clamp and fix the stainless steel plate with clamps, and control the gap between the T-shaped joints to be welded within 0.1mm. The square wave pulse laser is used for positioning welding at the end of the nail-shaped joint to be welded, and the length of ...

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Abstract

The invention discloses a pulse double-beam laser welding method. The method comprises the steps that the surface of a to-be-welded area of a to-be-welded stainless steel workpiece is cleaned; the to-be-welded stainless steel workpiece is assembled, clamped and fixed, the assembling gap of a welding joint of the to-be-welded stainless steel workpiece is smaller than 0.1 mm, and the misalignment of a butt joint is smaller than a preset value; pulse double-beam laser is adopted, and positioned welding is conducted on the to-be-welded joint according to preset laser welding parameters; and the pulse double-beam laser is adopted for welding the to-be-welded joint. By means of the pulse double-beam laser welding method, high-deformation-precision control and high-quality welding of the thin-wall weak-rigidity stainless steel can be achieved.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to pulsed double-beam laser welding. Background technique [0002] Some aerospace products need to realize the integration, lightweight and low-cost manufacturing of thin-walled steel structures, which put forward higher and higher requirements for the assembly efficiency and dimensional accuracy of structural parts. Compared with other welding methods, laser welding has the advantages of high energy density, large aspect ratio, small heat-affected zone range, fast welding speed and beautiful weld shape. Important welding method. [0003] Laser welding is divided into two modes: heat conduction welding and deep penetration welding, and the power density range suitable for heat conduction welding is 105~106W / cm 2 , the depth of penetration is relatively shallow; the power density range suitable for laser deep penetration welding is 106~107W / cm 2 , its depth of penetra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21B23K26/60B23K26/70B23K26/06B23K26/0622B23K26/14B23K37/04
Inventor 王舒王志敏姚为李保永步贤政谈哲君孙少波
Owner BEIJING HANGXING MACHINERY MFG CO LTD