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Laser welding method of stainless steel sheet fillet weld and clamp thereof

A technology of laser welding jig and welding method, which is applied in the direction of laser welding equipment, welding equipment, welding equipment, etc., can solve the problems of heating, burning, emission electron conditions, arc drift, and variation in the welding area, and achieve good process stability, The clear effect of process parameters

Active Publication Date: 2013-11-27
NANJING ZHONGKE RAYCHAM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because it is thin plate fillet weld welding, the welding current is taken as a small value, which is prone to arc drift, and the temperature of the cathode spot is very high, which will cause heating and burning in the welding area and the condition of emitting electrons will deteriorate, resulting in the continuous beating of the cathode spot, which is difficult to maintain normal welding

Method used

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  • Laser welding method of stainless steel sheet fillet weld and clamp thereof
  • Laser welding method of stainless steel sheet fillet weld and clamp thereof
  • Laser welding method of stainless steel sheet fillet weld and clamp thereof

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Effect test

Embodiment 1

[0029] Take stainless steel sheet material 304, thickness 0.7mm, welding length 10mm as an example.

[0030] The following steps and process parameters are used to make:

[0031] (1) Two thin plates with a thickness of 0.7mm are fixed by a welding jig with one side of the jig at a horizontal position and the other side at a 90° angle. The jig is made of copper. Because of the high reflectivity of copper, it is not easy to make the back of the thin plate when welding the thin plate. Adhesion with the fixture, the base is made of cast steel;

[0032] (2) Wipe the surface of the stainless steel sheet to be welded with absolute ethanol to remove the oil on the surface;

[0033] (3) Lap the horizontal stainless steel sheet to be welded to two-thirds of the thickness of another vertical stainless steel sheet, and fix the two sheets tightly by adjusting the clamp;

[0034] (4) 4 shielding gas nozzles arranged sequentially in the form of steps on a plane, coaxial protection;

...

Embodiment 2

[0039] As an improvement of the present invention, the CCD sensor is first taught to the robot during the welding operation, and then the parameters are set so that the robot can complete the welding operation instead. After adopting this design, the CCD sensor avoids the error of human eye observation during the teaching process, realizes precise positioning by observing the start and end positions on the computer monitor, and ensures the production efficiency of welding. The rest of the structural features and advantages are exactly the same as in Embodiment 1.

Embodiment 3

[0041] As an improvement of the present invention, the parameters are welded according to the following process parameters, the laser output power is 1000w, the welding speed is 2m / min, the shielding gas flow rate is 10L / min, and the defocus amount is +15mm. After adopting this design, the low welding speed makes the weld formation more stable, and the low power avoids welding penetration, but oxidation is easy to occur due to the slow speed. All the other structures and advantages are identical to Embodiment 1.

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Abstract

The invention relates to a laser welding method of a stainless steel sheet fillet weld and a clamp of the laser welding method. The laser welding method comprises the steps that four protective gas nozzles which are coaxial are used, argon serves as protective gas, demonstration location is conducted through a CCD sensor, visual locating by an operator is replaced, the included angle between a YW-52 welding head and the Z axis ranges from 25 degrees to 30 degrees, a horizontal sheet is in lap joint with the position at the two thirds of the thickness of a vertical sheet, the off-focus value ranges from +15mm to +25mm, the welding speed ranges from 2m / min to 6m / min, and laser welding is conducted. According to the laser welding method of the stainless steel sheet fillet weld, the precision and the speed of production are improved, sheet fillet weld fillet transition is achieved, the front surface and the back surface are not provided with oxidation tints, the welding quality can meet mass production, and the technical requirements of product design are achieved. In order to improve the efficiency and the quality of the welding method, when welding is conducted, the special clamp is applied. According to the welding clamp, one clamp body is in the horizontal position, the other clamp body is perpendicular to the clamp body in the horizontal position, and two 0.7mm sheets are fixed through the welding clamp. Through a rapid fixture, a gasket, pressing plates, a platform and screws, stainless steel can be rapidly located and firmly fixed, and the stainless steel can be prevented from being abraded in the process of fixing.

Description

technical field [0001] The invention relates to laser welding technology, in particular to a method for laser welding fillet welds of stainless steel sheets. The invention also relates to a special fixture for the laser welding method. Background technique [0002] Welding deformation control technology for thin plates, fillet weld failure and oxidation color are technical problems in the welding field. Welding deformation is related to factors such as materials, welding processes, and welding methods; fillet weld failure is related to the rationality of fixture design, Robot teaching is related to the traditional guide laser red light guidance of the KUKA robot. The teaching error on the fillet weld of the thin plate is very large. It cannot guarantee that the laser is irradiated at the predetermined position, which makes it difficult to form the weld. Human eyes have errors in the observation of red light. Relatively large; the oxidation color is related to the type of pr...

Claims

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Application Information

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IPC IPC(8): B23K26/24B23K26/42B23K26/14B23K37/04
Inventor 刘祥宇邢飞徐国建张景全
Owner NANJING ZHONGKE RAYCHAM TECH
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