Laser welding method

A technology of laser welding and welding speed, applied in laser welding equipment, welding medium, welding equipment and other directions, can solve the problems of easy belt breakage, affecting the quality of steel grades, unstable welding performance, etc., to reduce the probability of belt breakage, welding The effect of full seam and improved welding performance

Inactive Publication Date: 2017-05-31
BEIJING SHOUGANG COLD ROLLED SHEET
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For steels with a large carbon equivalent, the welding performance is unstable, and the strip is prone to breakage, which affects the quality of the steel

Method used

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Examples

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Embodiment 1

[0045] In Example 1, the raw material composition for hot rolling includes 0.095% C, 2.3% Mn, 0.35% Si, 0.013% P, and 0.008% S. The strip specification is 3.5mm*1200mm. A welding wire consisting of 0.07%C, 0.87%Si, 1.45%Mn, 0.012%P, 0.006%S, 0.13%Cu, 0.006%Ni, 0.045%Cr and 97.411%Fe was filled between the front and rear strips. During laser welding, welding is carried out according to the welding power of 11000W, welding speed of 4m / min, wire feeding speed of 4m / min, and annealing current of 120A. The finished product manufactured from the final strip steel is a dual-phase steel of 1000MPa, with a tensile strength of 1000MPa.

[0046] figure 2 The metallographic structure diagram of the above-mentioned 1000MPa grade dual-phase steel is shown. image 3 Shown is the metallographic diagram of the structure of the weld seam obtained by welding the strip steel in Example 1 by using the existing laser welding method. Figure 4 The metallographic diagram of the structure of the ...

Embodiment 2

[0048] In Example 2, the raw material components for hot rolling include 0.090% C, 2.23% Mn, 0.32% Si, 0.012% P, and 0.007% S. The specification of strip steel is 3.5mm*1088mm. A welding wire consisting of 0.07%C, 0.87%Si, 1.45%Mn, 0.012%P, 0.006%S, 0.13%Cu, 0.006%Ni, 0.045%Cr and 97.411%Fe was filled between the front and rear strips. During laser welding, welding is carried out according to the welding power of 11000W, welding speed of 4.5m / min, wire feeding speed of 4.5m / min, and annealing current of 130A. The final tensile strength of the finished product reaches 1011MPa.

[0049] Image 6 Shown is the microstructure metallographic diagram of the weld seam obtained by welding the strip steel in Example 2 by using the existing laser welding method. Figure 7 Shown is the metallographic diagram of the structure of the weld seam obtained by adopting the method of the laser weld seam in the second embodiment. It can be seen that the welding seam is fully filled by the meth...

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Abstract

The invention relates to the field of metal machining, in particular to a laser welding method. The laser welding method provided by the embodiment of the invention is used for achieving the technical effect of reducing probability of strip breakage. The method comprises the steps that the position between former strip steel and later strip steel which are about to be subjected to laser welding is filled with welding wires; and the former strip steel, the later strip steel and the welding wires are subjected to laser welding. The welding wires comprise, by mass, 0.05-0.07% of carbon, 0.6-0.9% of silicon, 1.3-1.5% of manganese, 0.01-0.015% of phosphorus, 0.004-0.008% of sulfur, 0.1-0.15% of copper, 0.004-0.008% of nickel and 0.04-0.06% of chromium.

Description

technical field [0001] The invention relates to the field of metal processing, in particular to a laser welding method. Background technique [0002] The welding machine is the key equipment of the pickling tandem rolling unit, which affects the production efficiency of the whole unit. At present, the most commonly used welding machine in China is the laser welding machine, which uses laser to weld steel types. The weldability of the steel grade will be affected by the carbon equivalent of the steel grade, specifically the greater the carbon equivalent, the worse the weldability. For steels with large carbon equivalents, the welding performance is unstable, and broken strips are prone to occur, which in turn affects the quality of the steels. Contents of the invention [0003] An embodiment of the present invention provides a laser welding method, which is used to achieve the technical effect of reducing the probability of occurrence of broken belts. [0004] The method...

Claims

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Application Information

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IPC IPC(8): B23K26/24B23K35/30
CPCB23K26/24B23K35/3073
Inventor 李振程晓杰柳智博孔凡庆关建东陈瑾李树森吴耐
Owner BEIJING SHOUGANG COLD ROLLED SHEET
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